个人简介

2010 - present, Chair, Department of Chemistry, Washington University, St. Louis, MO. 2006 - present , George E. Pake Professor in Arts & Sciences, Washington University, St. Louis, MO. 2004 - 2010, Associate Director, Center for Materials Innovation, Washington University, St. Louis, MO. 2001 - 2006, Professor of Chemistry, Washington University, St. Louis, MO. 1993 - 2001, Associate Professor of Chemistry, Washington University, St. Louis, MO. 1987 - 1993, Assistant Professor of Chemistry, Washington University, St. Louis, MO. 1985 - 1987, Postdoctoral Fellow, Indiana University, Bloomington, Indiana. Advisor: Distinguished Professor Malcolm H. Chisholm.

研究领域

synthetic inorganic and materials chemistry/optical properties of semiconductor nanocrystals/including quantum wires/belts and platelets/metallic nanoparticles/magic-size nanoclusters/nanoparticle growth mechanisms/and charge and energy transport in nanowires

Semiconductor Quantum Wires, Belts, and Platelets. Pseudo-1D nanocrystals such as quantum wires (QWs) and quantum belts (QBs, nanoribbons) are in principle capable of transporting energy (excitons) and charge over long distances, and thus may have applications in solar-energy conversion and other technologies. However, excitons and charge carriers in QWs and QBs sample extremely large surface areas and thus have a high probability of encountering surface trap sites, precluding efficient transport. We have recently prepared semiconductor QWs and QBs in which excitons are efficiently delocalized over the entire length of the nanostructures, and the photoluminescence efficiencies are as high as 40%, rivaling those of quantum rods. By similar methods, crystalline, colloidal CdSe quantum platelets (QPs) are prepared at room temperature, which are remarkably mild conditions for nanocrystal synthesis. The flat QBs and QPs are obtained from a lamellar-template mechanism. Their excellent optical properties result from the smooth facets and effective passivation afforded by the template synthesis, which minimize surface trap-site populations. In future studies, these nanocrystals will be incorporated into next-generation solar cells and detectors. Magic-Size Nanoclusters. So-called magic-size semiconductor nanoclusters have discrete formulas such as (CdSe)13, (CdSe)19, (CdSe)33, and (CdSe)34, and are believed to have cage-like structures comparable to those of the carbon fullerenes, such as C60. Until recently, these nanoclusters were available only in complex mixtures, and no single magic-size nanocluster had been isolated in purity. We have discovered a synthesis that provides [(CdSe)13(primary amine)13] nanoclusters as pure compounds on the gram scale. We are close to isolating magic-size nanoclusters of other sizes and compositions as well. These nanoclusters are useful, room-temperature precursors for nanocrystals of varying morphologies, especially flat nanocrystals (see above). Access to gram quantities of pure magic-size nanoclusters should enable experimental structure determination, reactivity studies, and further explorations of their physical and spectroscopic properties.

近期论文

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Glennon, J.J.; Tang, R.; Buhro, W.E.; Loomis, R.A. Nano Lett. 2007, 7, 3290-3295. "Synchronous Photoluminescence Intermittency (Blinking) along Whole Semiconductor Quantum Wires." Dong, A.; Tang, R.; Buhro, W.E. J. Am. Chem. Soc. 2007, 129, 12254-12262. "Solution-Based Growth and Structural Characterization of Homo- and Hetero-branched Semiconductor Nanowires." Wang, F.; Yu, H.; Li, J.; Hang, Q.; Zemlyanov, D.; Gibbons, P.C.; Wang, L.-W.; Janes, D.B.; Buhro, W.E. J. Am. Chem. Soc.2007, 129, 14327-14335. "Spectroscopic Properties of Colloidal Indium Phosphide Quantum Wires." Wang, F.; Buhro, W.E. J. Am. Chem. Soc. 2007, 129, 14381-14387. "Determination of the Rod-Wire Transition Length in Colloidal Indium Phosphide Quantum Rods." Kanatzidis, M.G.; Poeppelmeier, K.R.; Buhro, W.E.; and 64 other coauthors Prog. Solid-State Chem. 2008, 36, 1-133. "Report from the third workshop on future directions of solid-state chemistry: The status of solid-state chemistry and its impact in the physical sciences." Hang, Q.; Wang, F.; Carpenter, P.D.; Zemlyanov, D.; Zakharov, D.; Stack, E.A.; Buhro, W.E.; Janes, D.B. Nano Lett. 2008,8, 49-55. "The Role of Molecular Surface Passivation in Electrical Transport Properties of InAs Nanowires." Glennon, J.J.; Buhro, W.E.; Loomis, R.A. J. Phys. Chem. C 2008, 112, 4813-4817. "A simple surface-trap-filling model for photoluminescence blinking spanning entire CdSe quantum wires." Sun, J.; Buhro, W.E. Angew. Chem. Int. Ed. 2008, 47, 3215-3218. "The Use of Single-Source Precursors for the Solution-Liquid-Solid Growth of Metal Sulfide Semiconductor Nanowires." Dong, A.; Yu, H.; Wang, F.; Buhro, W.E. J. Am. Chem. Soc. 2008, 130, 5954-5961. "Colloidal GaAs Quantum Wires: Solution-Liquid-Solid Synthesis and Quantum-Confinement Studies." Sun, J.; Wang, L.-W.; Buhro, W.E. J. Am. Chem. Soc. 2008, 130, 7997-8005. "Synthesis of Cadmium Telluride Quantum Wires and the Similarity of Their Band Gaps to Those of Equidiameter Cadmium Telluride Quantum Dots." Wang, F.; Tang, R.; Yu, H.; Gibbons, P.C.; Buhro, W.E. Chem. Mater. 2008, 20, 3656-3662. "Size- and Shape-controlled Synthesis of Bismuth Nanoparticles." Wang, F.; Yu, H.; Jeong, S.; Pietryga, J.M.; Hollingsworth, J.A.; Gibbons, P.C.; Buhro, W.E. ACS Nano 2008, 2, 1903-1913. "The Scaling of the Effective Band Gaps in Indium Arsenide Quantum Dots and Wires." Wang, F.; Tang, R.; Buhro, W. E. Nano Lett. 2008, 8, 3521-3524. "The Trouble with TOPO; Identification of Adventitious Impurities Beneficial to the Growth of Cadmium Selenide Quantum Dots, Rods, and Wires." Sun, J.; Buhro, W.E.; Wang, L.-W.; Schrier, J. Nano Lett. 2008, 8, 2913-2919. "Electronic Structure and Spectroscopy of Cadmium Telluride Quantum Wires." Wang, F.; Tang, R.; Kao, J. L.-F.; Dingman, S.D.; Buhro, W.E. J. Am. Chem. Soc. 2009, 131, 4983-4994. "Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth." Glennon, J.J.; Tang, R.; Buhro, W.E.; Loomis, R.A.; Bussian, D.A.; Htoon, H.; Klimov, V.I. Phys. Rev. B 2009, 80, 081303(R). "Exciton localization and migration in individual CdSe quantum wires at low temperatures." Liu, Y.-H.; Wayman, V.L.; Gibbons, P.C.; Loomis, R.A.; Buhro, W.E. Nano Lett. 2010, 10, 352-357. "Origin of High Photoluminescence Efficiencies in CdSe Quantum Belts." Wang, F.; Buhro, W.E. Small 2010, 6, 573-581. "An Easy Shortcut Synthesis of Size-Controlled Bismuth Nanoparticles, and Their Use in the SLS Growth of High-Quality Colloidal Cadmium Selenide Quantum Wires." Shields, S.P.; Richards, V.N.; Buhro, W.E. Chem. Mater. 2010, 22, 3212-3225. "Nucleation Control of Size and Dispersity in Aggregative Nanoparticle Growth. A Study of the Coarsening Kinetics of Thiolate-capped Gold Nanocrystals." Richards, V.N.; Rath, N.P.; Buhro, W.E. Chem. Mater. 2010, 22, 3556-3567. "Pathway from a Molecular Precursor to Silver Nanoparticles: The Prominent Role of Aggregative Growth." Richards, V.N.; Shields, S.P.; Buhro, W.E. Chem. Mater. 2011, 23, 137-144. "Nucleation Control in the Aggregative Growth of Bismuth Nanocrystals." Wang, F.; Wayman, V.L.; Loomis, R.A., Buhro, W.E. ACS Nano 2011, 5, 5188-5194. "Solution-Liquid-Solid Growth of Semiconductor Quantum-Wire Films." Liu, H.-S.; Wang, F.; Gibbons, P. C.; Buhro, W. E. J. Am. Chem. Soc. 2011, 133, 17005-17013. "Lamellar Assembly of Cadmium Selenide Nanoclusters into Quantum Belts." Wayman, V.L.; Morrison, P.J.; Wang, F.; Tang, R.; Buhro, W.E.; Loomis; R. A. J. Phys. Chem. Lett. 2012, 3, 2627-2632. "Bound 1D Excitons in Single CdSe Quantum Wires." Liu, Y.-H.; Wang, F.; Hoy, J.; Wayman, V.L.; Steinberg, L.K.; Loomis, R.A., Buhro, W.E. J. Am. Chem. Soc. 2012, 134, 18797–18803. "Bright Core-Shell Semiconductor Quantum Wires." Wang, Y.; Liu, Y.-H.; Buhro, W.E. submitted to Inorg. Chem. 2012, 52, 2933-2938. "Preparation of Primary Amine Derivatives of the Magic-Size Nanocluster (CdSe)13." Liu, Y.-H.; Wang, F.; Hoy, J.; Wayman, V.L.; Steinberg, L.K.; Loomis, R.A., Buhro, W.E. J. Am. Chem. Soc. 2012, 134, 18797–18803. "Bright Core-Shell Semiconductor Quantum Wires." Wang, Y.; Liu, Y.-H.; Zhang, Y.; Wang, F.; Kowalski, P.J. Rohrs, H.W.; Loomis, R.A.; Gross, M.L.; Buhro, W.E. Angew. Chemie Int. Ed. 2012, 51, 6154-6157. "Isolation of the magic-size CdSe nanoclusters [(CdSe)13(n-octylamine)13] and [(CdSe)13(n-oleylamine)13]." Schuette, W.M.; Buhro, W.E. ACS Nano 2013, 7, 3844-3853. "Silver Chloride as a Heterogeneous Nucleant for the Growth of Silver Nanowires."