201. Introduction: Nanoparticle Chemistry
D. V. Talapin and E. V. Shevchenko. Chem. Rev. 2016, 116, 10343.
200. Facile, Economic and Size-Tunable Synthesis of Metal Arsenide Nanocrystals
V. Srivastava, E. M. Janke, B. T. Diroll, R. D. Schaller, and D. V. Talapin. Chem. Mater. 2016, 28, 6797.
199. Surface-Area Dependent Electron Transfer Between Isoenergetic 2D Quantum Wells and a Molecular Acceptor
B. Diroll, I. Fedin, P. Darancet, D. V. Talapin, R. Schaller. J. Am. Chem. Soc. 2016, 138, 11109.
198. Self-Assembly of Colloidal Nanocrystals: From Intricate Structures to Functional Materials
M. Boles, M. Engel, and D. V. Talapin. Chem. Rev. 2016, 116, 11220.
197. Building Devices from Colloidal Quantum Dots (solicited review)
C. R. Kagan, E. Lifshitz, E. H. Sargent, and D. V. Talapin. Science 2016, 353, 885.
196. Colloidal CdSe Quantum Rings
I. Fedin and D. V. Talapin. J. Am. Chem. Soc. 2016, 138, 9771.
195. Solution-Processed, Ultrathin Solar Cells from CdCl3−-capped CdTe Nanocrystals: The Multiple Roles of CdCl3− Ligands
H. Zhang, J. M. Kurley, J. C. Russell, J. Jang, D. V. Talapin. J. Am. Chem. Soc. 2016, 138, 7464.
194. Assessment of Anisotropic Semiconductor Nanorod and Nanoplatelet Heterostructures with Polarized Emission for Liquid Crystal Display Technology
P. Cunningham, J. B. Souza Jr, I. Fedin, C. She, B. Lee, and D. V. Talapin. ACS Nano 2016, 10, 5769.
193. The surface science of nanocrystals
M. A. Boles, D. Ling, T. Hyeon, D. V. Talapin. Nat. Mater. 2016, 15, 141.
192. Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2– Ligands Lead To Charge Carrier Diffusion Lengths Over 2 μm
R. W. Crisp, R. Callahan, O. G. Reid, D. S. Dolzhnikov, D. V. Talapin, G. Rumbles, J. M. Luther, and N. Kopidakis. J. Phys. Chem. Lett. 2015, 6, 4815.
191. Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets
Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Peter D. Dahlberg, Gregory S. Engel, Richard D. Schaller, and Dmitri V. Talapin. ACS Nano 2015, 9, 9475.
190. Solution-Processed Transistors Using Colloidal Nanocrystals with Composition-Matched Molecular “Solders”: Approaching Single Crystal Mobility
Jaeyoung Jang, Dmitriy S. Dolzhnikov, Wenyong Liu, Sooji Nam, Moonsub Shim, and Dmitri V. Talapin. Nano Lett., 2015, 15, 6309.
189. Development and Structure/Property Relationship of New Electron Accepting Polymers Based on Thieno[2′,3′:4,5]pyrido[2,3-g]thieno[3,2-c]quinoline-4,10-dione for All-Polymer Solar Cells
In Hwan Jung, Donglin Zhao, Jaeyoung Jang, Wei Chen, Erik S. Landry, Luyao Lu, Dmitri V. Talapin, and Luping Yu. Chem. Mater., 2015, 27, 5941.
188. Many-Body Effects in Nanocrystal Superlattices: Departure from Sphere Packing Explains Stability of Binary Phases
Michael A. Boles and Dmitri V. Talapin. J. Am. Chem. Soc. 2015, 137, 4494.
187. Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells
Erfan Baghani, Stephen K. O’Leary, Igor Fedin, Dmitri V. Talapin, and Matthew Pelton. J. Phys. Chem. Lett. 2015, 6, 1032.
186. Prospects of Nanoscience with Nanocrystals
M. V. Kovalenko, A. Cabot, L. Manna, Z. Hens, D. V. Talapin, C. Kagan, V. Klimov, A. Rogach, P. Reiss, D. Milliron, P. Guyot-Sionnest, G. Konstantatos, W. Parak, T. Hyeon, B. Korgel, C. Murray, and W. Heiss. ACS Nano 2015, 9, 1012.
185. Picosecond Energy Transfer in Binary CdSe Nano-Platelet Solids: Outpacing Auger Recombination
C. E. Rowland, I. Fedin, H. Zhang, A. O. Govorov, S. K. Gray, D. V. Talapin, and R. D. Schaller. Nature Mater. 2015, 14, 484.
184. Size-dependent Energy Levels of InSb Quantum Dots Measured by Scanning Tunneling Spectroscopy
T. Wang, R. Vaxenburg, W. Liu, S. M. Rupich, E. Lifshitz, A. L. Efros, D. V. Talapin, and S. J. Sibener. ACS Nano 2015, 9, 725.
183. Composition-matched molecular “solders” for semiconductors
D. S. Dolzhnikov, H. Zhang, J. Jang, J. S. Son, M. G. Panthani, S. Chattopadhyay, T. Shibata, and D. V. Talapin. Science 2015, 347, 425.
Technology Update: “Semiconductor solder seals nanojoints“
182. Inorganic Surface Ligands for Colloidal Nanomaterials
A. Nag, H. Zhang, E. Janke, and D. V. Talapin. Z. Phys. Chem. (Special issue Horst Weller 60th birthday) 2015, 229, 85.
181. Soft Epitaxy of Nanocrystal Superlattices
Sara Rupich, Fernando Castro, William T.M. Irvine, and Dmitri Talapin. Nat. Commun. 2014, 5, 5045.
180. Surface Functionalization of Semiconductor and Oxide Nanocrystals with Small Inorganic Oxoanions (PO43–, MoO42–) and Polyoxometalate Ligands
Jing Huang, Wenyong Liu, Dmitriy S. Dolzhnikov, Loredana Protesescu, Maksym V. Kovalenko, Bonil Koo, Soma Chattopadhyay, Elena V. Shevchenko, and Dmitri V. Talapin. ACS Nano 2014, 8, 9388.
179. Nanocrystal Grain Growth and Device Architectures for High-Efficiency CdTe Ink-Based Photovoltaics
Ryan W. Crisp, Matthew G. Panthani, William L. Rance, Joel N. Duenow, Philip A. Parilla, Rebecca Callahan, Matthew S. Dabney, Joseph J. Berry, Dmitri V. Talapin, and Joseph M. Luther. ACS Nano 2014, 8, 9063.
178. Carrier Dynamics in Highly Quantum-Confined, Colloidal Indium Antimonide Nanocrystals
Angela Y. Chang, Wenyong Liu, Dmitri V. Talapin, and Richard D. Schaller. ACS Nano 2014, 8, 8513.
177. Probing the Surface of Colloidal Nanomaterials with Potentiometry in Situ
Igor Fedin and Dmitri V. Talapin. J. Am. Chem. Soc. 2014, 136, 11228.
176. Thermoelectric Tin Selenide: The Beauty of Simplicity
Hao Zhang and Dmitri V. Talapin. Angew. Chem. Int. Ed. 2014, 53, 9126.
175. Colloidal Quantum Rods and Wells for Lighting and Lasing Applications
C. She, I. Fedin, M. A. Boles, D. S. Dolzhnikov, R. D. Schaller, M. Pelton, and D. V. Talapin. SID Digest 2014, 45, 134.
174. Colloidal Nanocrystals with Inorganic Halide, Pseudohalide, and Halometallate Ligands
Hao Zhang, Jaeyoung Jang, Wenyong Liu, and Dmitri V. Talapin. ACS Nano 2014, 8, 7359.
173. Connecting the Dots (Perspective)
Michael A. Boles and Dmitri V. Talapin. Science 2014, 344, 1340.
172. Role of Precursor Reactivity in Crystallization of Solution-Processed Semiconductors: The Case of Cu2ZnSnS4
Chengyang Jiang, Wenyong Liu, and Dmitri V. Talapin. Chem. Mater. 2014, 26, 4038.
171. All-Inorganic Nanocrystals as a Glue for BiSbTe Grains: Design of Interfaces in Mesostructured Thermoelectric Materials
Jae Sung Son, Hao Zhang, Jaeyoung Jang, Bed Poudel, Al Waring, Luke Nally, and Dmitri V. Talapin. Angew. Chem. Int. Ed. 2014, 126, 7596.
170. Synthesis and Search for Design Principles of New Electron Accepting Polymers for All-Polymer Solar Cells
In Hwan Jung, Wai-Yip Lo, Jaeyoung Jang, Wei Chen, Donglin Zhao, Erik S. Landry, Luyao Lu, Dmitri V. Talapin, and Luping Yu. Chem. Mater. 2014, 26, 3450.
169. Low-Threshold Stimulated Emission Using Colloidal Quantum Wells
Chunxing She, Igor Fedin, Dmitriy S. Dolzhnikov, Arnaud Demortière, Richard D. Schaller, Matthew Pelton, and Dmitri V. Talapin. Nano Lett. 2014, 14, 2772.
168. Self-Assembly of Tetrahedral CdSe Nanocrystals: Effective “Patchiness” via Anisotropic Steric Interaction
Michael A. Boles and Dmitri V. Talapin. J. Am. Chem. Soc. 2014, 136, 5868.
167. Dispersion-free continuum two-dimensional electronic spectrometer
Haibin Zheng, Justin R. Caram, Peter D. Dahlberg, Brian S. Rolczynski, Subha Viswanathan, Dmitriy S. Dolzhnikov, Amir Khadivi, Dmitri V. Talapin, and Gregory S. Engel. Appl. Opt. 2014, 53, 1909.
166. Exploring size and state dynamics in CdSe quantum dots using two-dimensional electronic spectroscopy
Justin R. Caram, Haibin Zheng, Peter D. Dahlberg, Brian S. Rolczynski, Graham B. Griffin, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, and Gregory S. Engel. J. Chem. Phys. 2014, 140, 084701.
165. Temperature-Dependent Hall and Field-Effect Mobility in Strongly Coupled All-Inorganic Nanocrystal Arrays
Jaeyoung Jang, Wenyong Liu, Jae Sung Son, and Dmitri V. Talapin. Nano Lett. 2014, 14, 653.
164. High Efficiency Solution Processed Sintered CdTe Nanocrystal Solar Cells: The Role of Interfaces
Matthew G. Panthani, J. Matthew Kurley, Ryan W. Crisp, Travis C. Dietz, Taha Ezzyat, Joseph M. Luther, and Dmitri V. Talapin. Nano Lett. 2014, 14, 670.
163. Thermal Stability of Colloidal InP Nanocrystals: Small Inorganic Ligands Boost High-Temperature Photoluminescence
Clare E. Rowland, Wenyong Liu, Daniel C. Hannah, Maria K. Y. Chan, Dmitri V. Talapin, and Richard D. Schaller. ACS Nano 2014, 8, 977.
162. Persistent Interexcitonic Quantum Coherence in CdSe Quantum Dots
Justin R. Caram, Haibin Zheng, Peter D. Dahlberg, Brian S. Rolczynski, Graham B. Griffin, Andrew F. Fidler, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, and Gregory S. Engel. J. Phys. Chem. Lett. 2014, 5, 196.
161. Bi1–xSbx Alloy Nanocrystals: Colloidal Synthesis, Charge Transport, and Thermoelectric Properties
Hao Zhang, Jae Sung Son, Jaeyoung Jang, Jong-Soo Lee, Wee-Liat Ong, Jonathan A. Malen, and Dmitri V. Talapin. ACS Nano 2013, 7, 10296.
160. Quantum dot light-emitting devices
Dmitri V. Talapin and Jonathan Steckel. MRS Bull. 2013, 38, 685.
159. Magnet-in-the-Semiconductor Nanomaterials: High Electron Mobility in All-Inorganic Arrays of FePt/CdSe and FePt/CdS Core-Shell Heterostructures
Jae Sung Son, Jong-Soo Lee, Elena V. Shevchenko, and Dmitri V. Talapin. J. Phys. Chem. Lett. 2013, 4, 1918.
158. Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals
Karthish Manthiram, Brandon J. Beberwyck, Dmitri V. Talapin, and A. Paul Alivisatos. J. Vis. Exp. 2013, 82, e50731.
157. Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays
Wee-Liat Ong, Sara M. Rupich, Dmitri V. Talapin, Alan J. H. McGaughey, and Jonathan A. Malen. Nat. Mater. 2013, 12, 410.
156. The chemistry of functional nanomaterials
Yadong Yin and Dmitri Talapin. Chem. Soc. Rev. 2013, 42, 2484.
155. Spin-dependent electronic processes and long-lived spin coherence of deep-level trap sites in CdS nanocrystals
K. J. van Schooten, J. Huang, D. V. Talapin, C. Boehme, and J. M. Lupton. Phys. Rev. B. 2013, 87, 125412.
154. Indirect Exciton Formation due to Inhibited Carrier Thermalization in Single CdSe/CdS Nanocrystals
Eyal Shafran, Nicholas J. Borys, Jing Huang, Dmitri V. Talapin, and John M. Lupton. J. Phys. Chem. Lett. 2013, 4, 691.
153. III-IV Nanocrystals Capped with Molecular Metal Chalcogenide Ligands: High Electron Mobility and Ambipolar Photoresponse
Wenyong Liu, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2013, 135, 1349.
152. Light-Induced Charged and Trap States in Colloidal Nanocrystals Detected by Variable Pulse Rate Photoluminescence Spectroscopy
Michele Saba, Mauro Aresti, Francesco Quochi, Marco Marceddu, Maria Antonietta Loi, Jing Huang, Dmitri V. Talapin, Andrea Mura, and Giovanni Bongiovanni. ACS Nano 2013, 7, 229.
151. Spin-Dependent Exciton Quenching and Spin Coherence in CdSe/CdS Nanocrystals
Kipp J. van Schooten, Jing Huang, William J. Baker, Dmitri V. Talapin, Christoph Boehme, and John M. Lupton. Nano Lett. 2013, 13, 65.
150. Two-dimensional electronic spectroscopy of CdSe nanoparticles at very low pulse power
Graham B. Griffin, Sandrine Ithurria, Dmitriy S. Dolzhnikov, Alexander Linkin, Dmitri V. Talapin, and Gregory S. Engel. J. Chem. Phys. 2013, 138, 014705.
149. Colloidal InSb Nanocrystals
Wenyong Liu, Angela Y. Chang, Richard D. Schaller, and Dmitri V. Talapin. 2012, 134, 20258.
148. Carrier Cooling in Colloidal Quantum Wells
Matthew Pelton, Sandrine Ithurria, Richard D. Schaller, Dmitriy S. Dolzhnikov, and Dmitri V. Talapin. Nano Lett. 2012, 12, 6158.
147. Colloidal Atomic Layer Deposition (c-ALD) using Self-Limiting Reactions at Nanocrystal Surface Coupled to Phase Transfer between Polar and Nonpolar Media
Sandrine Ithurria and Dmitri Talapin. J. Am. Chem. Soc. 2012, 134, 18585.
146. Effect of Metal Ions on Photoluminescence, Charge Transport, Magnetic and Catalytic Properties of All-Inorganic Colloidal Nanocrystals and Nanocrystal Solids
Angshuman Nag, Dae Sung Chung, Dmitriy S. Dolzhnikov, Nada M. Dimitrijevic, Soma Chattopadhyay, Tomohiro Shibata, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 13604.
145. Low Voltage, Hysteresis Free, and High Mobility Transistors from All-Inorganic Colloidal Nanocrystals
Dae Sung Chung, Jong-Soo Lee, Jing Huang, Angshuman Nag, Sandrine Ithurria, and Dmitri V. Talapin. Nano Lett. 2012, 12, 1813.
144. Soluble precursors for CuInSe2, CuIn1-xGaxSe2 and Cu2ZnSn(S,Se)4 based on colloidal nanocrystals and molecular metal chalcogenide surface ligands
Chengyang Jiang, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 5010.
143. Inorganically Functionalized PbS–CdS Colloidal Nanocrystals: Integration into Amorphous Chalcogenide Glass and Luminescent Properties
Maksym V. Kovalenko, Richard D. Schaller, Dorota Jarzab, Maria A. Loi, and Dmitri V. Talapin. J. Am. Chem. Soc. 2012, 134, 2457.
142. Tuning the Excitonic and Plasmonic Properties of Copper Chalcogenide Nanocrystals
Ilka Kriegel, Chengyang Jiang, Jessica Rodriguez-Fernández, Richard D. Schaller, Dmitri V. Talapin, Enrico da Como, and Jochen Feldmann. J. Am. Chem. Soc. 2012, 134, 1583.
141. Nanocrystal solids: A modular approach to materials design
Dmitri V. Talapin. MRS Bull. 2012, 37, 63.
140. Particle-Level Engineering of Thermal Conductivity in Matrix-Embedded Semiconductor Nanocrystals
Daniel C. Hannah, Sandrine Ithurria, Galyna Krylova, Dmitri V. Talapin, George C. Schatz, and Richard D. Schaller. Nano Lett. 2012, 12, 5797.
139. Measurement of electronic splitting in PbS quantum dots by two-dimensional nonlinear spectroscopy
Elad Harel, Sara M. Rupich, Richard D. Schaller, Dmitri V. Talapin, and Gregory S. Engel. Phys. Rev. B 2012, 86, 075412.
138. Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: Electric field effects on exciton and multiexciton states
Su Liu, Nicholas J. Borys, Jing Huang, Dmitri V. Talapin, and John M. Lupton. Phys. Rev. B 2012, 86, 045303.
137. Charged excitons, Auger recombination and optical gain in CdSe/CdS nanocrystals
Marco Marceddu, Michele, Saba, Francesco Quochi, Adriano Lai, Jing Huang, Dmitri V. Talapin, Andrea Mura, and Giovanni Bongiovanni. Nanotechnology 2012, 23, 015201.
136. Structural Defects in Periodic and Quasicrystalline Binary Nanocrystal Superlattices
Maryna I. Bodnarchuk, Elena V. Shevchenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 20837.
Binary nanocrystal superlattices (BNSLs) emerge as an important class of man-made materials where components and functionalities can be added, tuned, or combined in a predictable manner. These amazingly complex structures spontaneously self-assemble from colloidal solutions containing binary mixtures of functional (semiconducting, magnetic, plasmonic, etc.) nanocrystals. Further developments of the BNSL-based materials require a deep understanding and control over BNSL formation and structural perfection. Like any solid, BNSL can contain different kinds of structural defects. It is well-known that defects can have a tremendous effect on the material’s behavior. Defect engineering is used to modify and improve many of the mechanical, electrical, magnetic, and optical properties of conventional solids. In this work, we provide the first systematic analysis of structural defects in various BNSL structures. We used BNSLs as a platform for studying structural defects in both periodic (crystalline) and aperiodic (quasicrystalline) lattices, as well as for direct imaging of the interfaces between crystalline and quasicrystalline domains. Such direct observation of local imperfections in complex multicomponent lattices provides a unique insight into the fundamental aspects of crystal formation.
135. Colloidal self-assembly: Interlocked octapods
Sara M. Rupich and Dmitri V. Talapin. Nat. Mater. 2011, 10, 815.
Suspensions of octapod-shaped nanocrystals are seen to spontaneously interlock into chains, which in turn aggregate side-by-side to form three-dimensional crystals. The observed hierarchical self-assembly can be explained by the octapod’s shape and the solvent-tunable van der Waals interactions.
134. Observation of Size-Dependent Thermalization in CdSe Nanocrystals Using Time-Resolved Photoluminescence Spectroscopy
Daniel C. Hannah, Nicholas J. Dunn, Sandrine Ithurria, Dmitri V. Talapin, Lin X. Chen, Matthew Pelton, George C. Schatz, and Richard D. Schaller. Phys. Rev. Lett. 2011, 107, 177403.
We report heat dissipation times in semiconductor nanocrystals of CdSe. Specifically, a previously unresolved, subnanosecond decay component in the low-temperature photoluminescence decay dynamics exhibits longer decay lifetimes (tens to hundreds of picoseconds) for larger nanocrystals as well as a size-independent, ∼25-meV spectral shift. We attribute the fast relaxation to transient phonon-mediated relaxation arising from nonequilibrium acoustic phonons. Following acoustic phonon dissipation, the dark exciton state recombines more slowly via LO-phonon assistance resulting in the observed spectral shift. The measured relaxation time scales agree with classical calculations of thermal diffusion, indicating that interfacial thermal conductivity does not limit thermal transport in these semiconductor nanocrystal dispersions.
133. Metal-free Inorganic Ligands for Colloidal Nanocrystals: S2–, HS–, Se2–, HSe–, Te2–, HTe–, TeS32–, OH–, and NH2– as Surface Ligands
Angshuman Nag, Maksym V. Kovalenko, Jong-Soo Lee, Wenyong Liu, Boris Spokoyny, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 10612.
All-inorganic colloidal nanocrystals were synthesized by replacing organic capping ligands on chemically synthesized nanocrystals with metal-free inorganic ions such as S2–, HS–, Se2–, HSe–, Te2–, HTe–, TeS32–, OH– and NH2–. These simple ligands adhered to the NC surface and provided colloidal stability in polar solvents. The versatility of such ligand exchange has been demonstrated for various semiconductor and metal nanocrystals of different size and shape. We showed that the key aspects of Pearson’s hard and soft acids and bases (HSAB) principle, originally developed for metal coordination compounds, can be applied to the bonding of molecular species to the nanocrystal surface. The use of small inorganic ligands instead of traditional ligands with long hydrocarbon tails facilitated the charge transport between individual nanocrystals and opened up interesting opportunities for device integration of colloidal nanostructures.
132. Themed issue: Chemical transformations of nanoparticles
Dmitri V. Talapin and Yadong Yin. J. Mater. Chem. 2011, 21, 11454.
For a long time, chemists studied systems where composition and structure could be defined at the atomic level. Such determinism is natural in molecular compounds and in macroscopic bulk crystalline solids. As molecules became larger and larger, it was more and more difficult to keep this level of control. For the first time, chemists experienced this problem in polymers. Indeed, description of macromolecular substances required statistical approaches dealing with the average molecular weight and polydispersity. This transition from fully deterministic to statistical descriptions of chemical species was an important paradigm shift that required accepting new chemistry rules and inventing new characterization techniques. It definitely paid off. It is difficult to overestimate the importance of polymers for modern society…
131. Three-Dimensional Nanocrystal Superlattices Grown in Nanoliter Microfluidic Plugs
Maryna I. Bodnarchuk, Liang Li, Alice Fok, Sigrid Nachtergaele, Rustem F. Ismagilov, and Dmitri V. Talapin. J. Am. Chem. Soc. 2011, 133, 8956.
We studied the self-assembly of inorganic nanocrystals (NCs) confined inside nanoliter droplets (plugs) into long-range ordered superlattices. We showed that a capillary microfluidic platform can be used for the optimization of growth conditions for NC superlattices and can provide insights into the kinetics of the NC assembly process. The utility of our approach was demonstrated by growing large (up to 200 μm) three-dimensional (3D) superlattices of various NCs, including Au, PbS, CdSe, and CoFe2O4. We also showed that it is possible to grow 3D binary nanoparticle superlattices in the microfluidic plugs.
130. Band-like transport, high electron mobility and high photoconductivity in all-inorganic nanocrystal arrays
Jong-Soo Lee, Maksym V. Kovalenko, Jing Huang, Dae Sung Chung, and Dmitri V. Talapin. Nature Nanotech. 2011, 6, 348.
129. Evaluation of Ordering in Single-Component and Binary Nanocrystal Superlattices by Analysis of Their Autocorrelation Functions
Stefan Pichler, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Maksym Yarema, Gunther Springholz, Dmitri V. Talapin, and Wolfgang Heiss. ACS Nano 2011, 5, 1703.
128. The Role of Particle Morphology in Interfacial Energy Transfer in CdSe/CdS Heterostructure Nanocrystals
Nicholas J. Borys, Manfred J. Walter, Jing Huang, Dmitri V. Talapin, and John M. Lupton. Science 2010, 330, 1371.
Nanoscale semiconductor heterostructures such as tetrapods can be used to mimic light-harvesting processes. We used single-particle light-harvesting action spectroscopy to probe the impact of particle morphology on energy transfer and carrier relaxation across a heterojunction. The generic form of an action spectrum [in our experiments, photoluminescence excitation (PLE) under absorption in CdS and emission from CdSe in nanocrystal tetrapods, rods, and spheres] was controlled by the physical shape and resulting morphological variation in the quantum confinement parameters of the nanoparticle. A correlation between single-particle PLE and physical shape as determined by scanning electron microscopy was demonstrated. Such an analysis links local structural non-uniformities such as CdS bulbs forming around the CdSe core in CdSe/CdS nanorods to a lower probability of manifesting excitation energy–dependent emission spectra, which in turn is probably related to band alignment and electron delocalization at the heterojunction interface.
127. Multiexcitonic Dual Emission in CdSe/CdS Tetrapods and Nanorods
Andrey A. Lutich, Christian Mauser, Enrico Da Como, Jing Huang, Aleksandar Vaneski, Dmitri V. Talapin, Andrey L. Rogach, and Jochen Feldmann. Nano Lett. 2010, 10, 4646.
CdSe/CdS semiconductor nanocrystal heterostructures are currently of high interest for the peculiar electronic structure offering unique optical properties. Here, we show that nanorods and tetrapods made of such material combination enable efficient multiexcitonic emission, when the volume of the nanoparticle is maximized. This condition is fulfilled by tetrapods with an arm length of 55 nm and results in a dual emission with comparable intensities from the CdS arms and CdSe core. The relative intensities of the dual emission, originating from exciton phase-space filling and reduced Auger recombination, can be effectively modulated by the photon fluence of the pump laser. The results, obtained under steady-state detection conditions, highlight the properties of tetrapods as multiexciton dual-color emitters.
126. Alkyl Chains of Surface Ligands Affect Polytypism of CdSe Nanocrystals and Play an Important Role in the Synthesis of Anisotropic Nanoheterostructures
Jing Huang, Maksym V. Kovalenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 15866.
We show that the length of the alkyl chain of surface ligands can shift the equilibrium between the wurtzite and zinc blende polytypes of CdSe nanocrystals. In-situ wide-angle X-ray scattering measurements reveal that short-chain (e.g., propyl) phosphonic acids stabilize CdSe nanocrystals with the zinc blende phase whereas octadecylphosphonic acid stabilize nanocrystals with the wurtzite phase. We also demonstrate how this effect can be used to improve the shape selectivity in the synthesis of anisotropic CdSe/CdS and ZnSe/CdS nanoheterostructures.
125. Highly Monodisperse Bismuth Nanoparticles and Their Three-Dimensional Superlattices
Maskym Yarema, Maksym V. Kovalenko, Guenter Hesser, Dmitri V. Talapin, and Wolfgang Heiss. J. Am. Chem. Soc. 2010, 132, 15158.
A simple and reproducible synthesis of highly monodisperse and ligand-protected bismuth nanoparticles (Bi NPs) is reported. The size of the single-crystalline and spherically shaped NPs is controlled between 11 and 22 nm mainly by the reaction temperature. The high uniformity of the NPs allows their self-assembly into long-range-ordered two- and three-dimensional superstructures.
124. Nanocrystal Superlattices with Thermally Degradable Hybrid Inorganic-Organic Capping Ligands
Maksym V. Kovalenko, Maryna I. Bodnarchuk, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 15124.
Colloidal metallic and semiconductor nanocrystals (NCs) functionalized with metal chalcogenide complexes (MCCs) have shown a promise for designing materials that combine high carrier mobility with the electronic structure of strongly quantum-confined solids. Here we report a simple and general methodology for switching the repulsive forces responsible for colloidal stabilization of MCC-capped NCs from long-range electrostatic to short-range steric through the formation of tight ionic pairs with cationic surfactants. This noncovalent surface modification remarkably improved the ability of MCC-capped NCs to self-assemble into long-range ordered superlattices. These NCs are highly soluble in nonpolar solvents and compatible with various technologically relevant organic molecules and polymers. The hybrid inorganic−organic coating can be thermally decomposed at significantly lower temperatures compared to those required for removal of conventional organic ligands.
123. Enhanced color conversion from colloidal CdSe/CdS dot/rods by vertical microcavities
H. Puehringer, J. Roither, Maksym V. Kovalenko, M. Eibelhuber, T. Schwarzl, Dmitri V. Talapin, and Wolfgang Heiss. Appl. Phys. Lett. 2010, 97, 111115.
122. Probing the Surface of Transition-Metal Nanocrystals by Chemiluminesence
Galyna Krylova, Nada M. Dimitrijevic, Dmitri V. Talapin, Jeffrey R. Guest, Holger Borchert, Arun Lobo, Tijana Rajh, and Elena V. Shevchenko. J. Am. Chem. Soc. 2010, 132, 9102.
121. The Role of Order, Nanocrystal Size, and Capping Ligands in the Collective Mechanical Response of Three-Dimensional Nanocrystal Solids
Paul Podsiadlo, Galyna Krylova, Byeongdu Lee, Kevin Critchley, David J. Gosztola, Dmitri V. Talapin, Paul D. Ashby, and Elena V. Shevchenko, J. Am. Chem. Soc. 2010, 132, 8953.
120. Energetic and Entropic Contributions to Self-Assembly of Binary Nanocrystal Superlattices: Temperature as the Structure-Directing Factor
Maryna I. Bodnarchuk, Maksym V. Koyalenko, Wolfgang Heiss, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 11967.
119. Spatio-temporal dynamics of coupled electrons and holes in nanosize CdSe-CdS semiconductor tetrapods
C. Mauser, E. Da Como, J. Baldauf, A. L. Rogach, J. Huang, D. V. Talapin, and J. Feldmann. Phys. Rev. B 2010, 82, 081306.
118. Expanding the Chemical Versatility of Colloidal Nanocrystals Capped with Molecular Metal Chalcogenide Ligands
Maksym V. Kovalenko, Maryna I. Bodnarchuk, Jana Zaumseil, Jong-Soo Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 10085.
117. “Magnet-in-the-Semiconductor” FePt−PbS and FePt−PbSe Nanostructures: Magnetic Properties, Charge Transport, and Magnetoresistance
Jong-Soo Lee, Maryna I. Bodnarchuk, Elena V. Shevchenko, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 6382.
116. Semiconductor Nanocrystals Functionalized with Antimony Telluride Zintl Ions for Nanostructrued Thermoelectrics
Maksym V. Kovalenko, Boris Spokoyny, Jong-Soo Lee, Marcus Scheele, Andrew Weber, Susanthri Perera, Daniel Landry, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 6686.
115. Increased Color-Conversion Efficiency in Hybrid Light-Emitting Diodes utilizing Non-Radiative Energy Transfer
Soontorn Chanyawadee, Pavlos G. Lagoudakis, Richard T. Harley, Martin D. B. Charlton, Dmitri V. Talapin, Hong Wen Huang, and Chung-Hsiang Lin. Adv. Mater. 2010, 22, 602.
114. Size-Dependent Multiple Twinning in Nanocrystal Superlattices
Sara M. Rupich, Elena V. Shevchenko, Maryna I. Bodnarchuk, Byeongdu Lee, and Dmitri V. Talapin. J. Am. Chem. Soc. 2010, 132, 289.
113. Prospects of Nanocrystal Solids as Electronic and Optoelectronic Materials
Dmitri V. Talapin, Jong-Soo Lee, Maksym V. Kovalenko, and Elena V. Shevchenko. Chem. Rev. 2010, 110, 389. (Invited review, cover highlight)
112. Comparison of Structural Behavior of Nanocrystals in Randomly Packed Films and Long-Range Ordered Superlattices by Time-Resolved Small Angle X-ray Scattering
Byeongdu Lee, Paul Podsiadlo, Sara Rupich, Dmitri V. Talapin, Tijana Rajh, and Elena V. Shevchenko. J. Am. Chem. Soc. 2009, 131, 16386.
We evaluated the difference between randomly packed NCs (disordered films), periodic films, and three-dimensional crystals in terms of their lattice structure and interparticle spacing using time-resolved small-angle X-ray scattering (SAXS) technique. The work was performed on nanocrystal solids formed by 7 nm PbS nanocrystals capped with oleic acid. We have found that interparticle spacing in faceted three-dimensional crystals is ∼25% smaller as compared with three-dimensional films formed by solvent evaporation. We showed that interparticle spacing in faceted three-dimensional crystals is significantly smaller than the length of a fully extended molecule of oleic acid, and hence, full interdigitation of molecules from neighboring particle is doubtful. Also we demonstrated that postpreparative mild thermal treatment allows further manipulation of interparticle spacing.
111. Energetic disorder limits energy transfer in semiconductor nanocrystal–DNA–dye conjugates
Klaus Becker, Andrey L. Rogach, Jochen Feldmann, Dmitri V. Talapin, and John M. Lupton. App. Phys. Lett. 2009, 95, 143101.
We demonstrate the influence of
110. Quasicrystalline order in self-assembled binary nanoparticle superlattices
Dmitri V. Talapin, Elena V. Shevchenko, Maryna I. Bodnarchuk, Xingchen Ye, Jun Chen, and Christopher B. Murray. Nature 2009, 461, 964.
The discovery of quasicrystals in 1984 changed our view of ordered solids as periodic structures and introduced new long-range-ordered phases lacking any translational symmetry. Quasicrystals permit symmetry operations forbidden in classical crystallography, for example five-, eight-, ten- and 12-fold rotations, yet have sharp diffraction peaks. Intermetallic compounds have been observed to form both metastable and energetically stabilized quasicrystals; quasicrystalline order has also been reported for the tantalum telluride phase with an approximate Ta1.6Te composition. Later, quasicrystals were discovered in soft matter, namely supramolecular structures of organic dendrimers and tri-block copolymers, and micrometre-sized colloidal spheres have been arranged into quasicrystalline arrays by using intense laser beams that create quasi-periodic optical standing-wave patterns. Here we show that colloidal inorganic nanoparticles can self-assemble into binary aperiodic superlattices. We observe formation of assemblies with dodecagonal quasicrystalline order in different binary nanoparticle systems: 13.4-nm Fe2O3 and 5-nm Au nanocrystals, 12.6-nm Fe3O4 and 4.7-nm Au nanocrystals, and 9-nm PbS and 3-nm Pd nanocrystals. Such compositional flexibility indicates that the formation of quasicrystalline nanoparticle assemblies does not require a unique combination of interparticle interactions, but is a general sphere-packing phenomenon governed by the entropy and simple interparticle potentials. We also find that dodecagonal quasicrystalline superlattices can form low-defect interfaces with ordinary crystalline binary superlattices, using fragments of (33.42) Archimedean tiling as the ‘wetting layer’ between the periodic and aperiodic phases.
109. Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands
Maksym V. Kovalenko, Marcus Scheele, and Dmitri V. Talapin. Science 2009, 324, 1417.
Similar to the way that atoms bond to form molecules and crystalline structures, colloidal nanocrystals can be combined together to form larger assemblies. The properties of these structures are determined by the properties of individual nanocrystals and by their interactions. The insulating nature of organic ligands typically used in nanocrystal synthesis results in very poor interparticle coupling. We found that various molecular metal chalcogenide complexes can serve as convenient ligands for colloidal nanocrystals and nanowires. These ligands can be converted into semiconducting phases upon gentle heat treatment, generating inorganic nanocrystal solids. The utility of the inorganic ligands is demonstrated for model systems, including highly conductive arrays of gold nanocrystals capped with Sn2S64– ions and field-effect transistors on cadmium selenide nanocrystals.
108. Exciton–Exciton Interaction and Optical Gain in Colloidal CdSe/CdS Dot/Rod Nanocrystals
Michele Saba, Stefan Minniberger, Francesco Quochi, Juergen Roither, Marco Marceddu, Agnieszka Gocalinska, Maksym V. Kovalenko, Dmitri V. Talapin, Wolfgang Heiss, Andrea Mura, and Giovanni Bongiovanni. Adv. Mater. 2009, 21, 4942.
Exciton–exciton interaction in dot/rod CdSe/CdS nanocrystals has proved to be very sensitive to the shape of nanocrystals, due to the unique band alignment between CdSe and CdS. Repulsive exciton–exciton interaction is demonstrated, which makes CdSe/CdS dot/rods promising gain media for solution‐processable lasers, with projected pump threshold densities below 1 kW cm−2 for continuous wave lasing.
107. Non-blinking and photostable upconverted luminescence from single lanthanide-doped nanoscrystals
S. Wu, G. Han, D. Milliron, S. Aloni, V. Altoe, D. Talapin, B. Cohen, and P. J. Schuck. Proc. Nat. Acad. Sci. 2009, 106, 10917.
The development of probes for single-molecule imaging has dramatically facilitated the study of individual molecules in cells and other complex environments. Single-molecule probes ideally exhibit good brightness, uninterrupted emission, resistance to photobleaching, and minimal spectral overlap with cellular autofluorescence. However, most single-molecule probes are imperfect in several of these aspects, and none have been shown to possess all of these characteristics. Here we show that individual lanthanide-doped upconverting nanoparticles (UCNPs)—specifically, hexagonal phase NaYF4 (β-NaYF4) nanocrystals with multiple Yb3+ and Er3+ dopants—emit bright anti-Stokes visible upconverted luminescence with exceptional photostability when excited by a 980-nm continuous wave laser. Individual UCNPs exhibit no on/off emission behavior, or “blinking,” down to the millisecond timescale, and no loss of intensity following an hour of continuous excitation. Amphiphilic polymer coatings permit the transfer of hydrophobic UCNPs into water, resulting in individual water-soluble nanoparticles with undiminished photophysical characteristics. These UCNPs are endocytosed by cells and show strong upconverted luminescence, with no measurable anti-Stokes background autofluorescence, suggesting that UCNPs are ideally suited for single-molecule imaging experiments.
106. Wavefunction Mapping of Immobilized InP Semiconductor Nanocrystals
G. Maruccio, C. Meyer, T. Matsui, D. V. Talapin, S. G. Hickey, H. Weller, and R. Wiesendanger. Small 2009, 5, 808.
105. Photocurrent enhancement in hybrid nanocrystal quantum dot / p-i-n photovoltaic devices
S. Chanyawadee, R. T. Harley, M. Henini, D. V. Talapin, and P. G. Lagoudakis. Phys. Rev. Lett. 2009, 102, 077402.