http://chemistry.uark.edu/1722.htm
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Xiaogang Peng CHEM 245 |
Degrees:
B.S., Jilin University, 1987; Chemistry and Physics of Macromolecules
Ph. D., Jilin University, 1992; Physical Chemistry and Polymer Science
Postdoctoral, UC Berkeley, 1994-1996;
Staff Scientist, UC Berkeley & Lawrence Berkeley National Laboratory, 1996-1999
Scharlau Professor of Chemistry, 2005-
Professor, University of Arkansas, 2005-
Associate Professor, University of Arkansas, 2003 -2005
Assistant Professor, University of Arkansas, 1999-2003
nanochemistry and nanomaterials
Research:Colloidal Nanocrystals: Chemistry and Applications
As one of the major driving forces for modern chemistry, advanced materials are currently of great interest to many chemists. This research group is focused on nano-materials, which are a class of very promising advanced materials. Although thousands of papers reported the preparations of various kinds of nano-materials, the relevant fundamental chemistry for their synthesis and manipulation is still the limiting point for many fundamental studies and technical applications. The goals of our research include: (1) to accumulate systematical chemistry knowledge for designing and processing nano-materials, especially inorganic nanocrystals and related materials; (2) to develop technically useable nano-materials and devices.
(A) A new generation of solar cells. Solar energy is the best energy source, in terms of environment and availability. According to the National Photovoltaic Research Plan (1995-2000), the limitation is the cost of current technology. This research project is developing new, inexpensive, but high performance solar cells by taking advantage of the excellent possibility of inorganic semiconductor nanocrystals and nanostructures.
(B) Growth mechanism of inorganic nanocrystals. Crystallization is a very common process for materials preparation, characterization and processing. However, the existing theories cannot predict and explain crystallization processes systematically. Because of this, our understanding of growth mechanism of inorganic nanocrystals is very limited, which consequently makes it very difficult to design a controllable synthesis. However, the surface energy, which is the driving force of any crystallization process, is very significant ONLY in the nanometer regime. Therefore, a quantitative understanding of the growth of inorganic nanocrystals is possible. Furthermore, we believe that this study will eventually provide a framework for modern crystallization chemistry.
(C) Greener chemical synthetic approaches. Colloidal nanocrystals are of great interest for both fundamental research and industrial applications. The cost and safety for the production of those novel materials will play a key role in the future development of those materials. For this reason, this group is pursuing synthetic chemistry which not only generates high quality nanocrystals but also is environmentally-benign, inexpensive, safe and user-friendly. Such efforts greatly rely on the understanding of the growth mechanisms of colloidal nanocrystals.
(D) Interfacial chemistry of a colloidal nanocrystal and its surroundings. Common interface or surface must be studied using very sensitive, expensive and normally destructive detection apparatus. However, the specific surface area of colloidal nanocrystals is magnitudes higher than that of the corresponding bulk solids. As a result, the interface can be studied using typical solution phase methods in a non-destructive manner. Such studies will serve as model systems for the corresponding bulk solids. Furthermore, the development of the processing chemistry of colloidal nanocrystals has to be based on the knowledge regarding the interface.
(E) Ligands chemistry. Colloidal nanocrystals are metastable species and often coated by a monolayer of organic ligands. The processing of colloidal nanocrystals generally means manipulating the ligands monolayer. We are interested in the development of reliable and feasible processing chemistry based on the rational design of adequate ligands for different types of colloidal nanocrystals.
(F) Chemistry problems for biosensors using colloidal nanocrystals. This research direction is another example to utilize the fundamental knowledge for the advancement of certain types of nanotechnologies. We are exploring the related chemistry for the development of better, more convenient, and less expensive biosensors. For example, a very important issue is to establish chemical methods for the preparation of inorganic nanocrystals with defined number of binding sites for the biological targets.
Publications after 2000
1. “Efficient and Color-Tunable Mn-Doped ZnSe Nanocrystal Emitters: Control of Optical Performance via Greener Synthetic Chemistry”, Pradhan, Narayan; Peng, Xiaogang, J. Am. Chem. Soc. 2007, ASAP.
2. “Interparticle Influence on Size/Size Distribution Evolution of Nanocrystals” Thessing, Jason; Qian, Jianghong; Chen, Haiyan; Pradhan, Narayan; Peng, Xiaogang, J. Am. Chem. Soc. , 2007, ASAP.
3. “Efficient, Stable, Small, and Water-Soluble Doped ZnSe Nanocrystal Emitters as Non-Cadmium Biomedical Labels”, Nano Letter, 2007, vol 7, 312-317.
4. “University spin-offs: Opportunity or challenge?”, Peng, Xiaogang, Nature Materials (2006), 5(12), 923-925
5. "Initialization and read-out of spins in coupled core-shell quantum dots”, Berezovsky, J.; Gywat, O.; Meier, F.; Battaglia, D.; Peng, X.; Awschalom, D. D. Nature Physics (2006), 2(12), 831-834
6. “Crystalline nanoflowers with different chemical compositions and physical properties grown by limited ligand protection”, Narayanaswamy, Arun; Xu, Huifang; Pradhan, Narayan; Peng, Xiaogang, Angewandte Chemie, International Edition (2006), 45(32), 5361-5364. (Cover and VIP paper)
7. “Formation of Nearly Monodisperse In2O3 Nanodots and Oriented-Attached Nanoflowers: Hydrolysis and Alcoholysis vs Pyrolysis”, Narayanaswamy, Arun; Xu, Huifang; Pradhan, Narayan; Kim, Myeongseob; Peng, Xiaogang, J. Am. Chem. Soc. (2006), 128(31), 10310-10319.
8. "Colloidal CdSe Quantum Wires by Oriented Attachment”, Pradhan, Narayan; Xu, Huifang; Peng, Xiaogang, Nano Letters, 2006, 6, 720-724.
9. “Modelling the formation of high aspect CdSe quantum wires: axial-growth versus oriented-attachment mechanisms”, Barnard, Amanda S.; Xu, Huifang; Li, Xiaochun; Pradhan, Narayan; Peng, Xiaogang; Nanotechnology, 2006, vol 17, 5707-5714
10. “An Alternative of CdSe Nanocrystal Emitters: Pure and Tunable Impurity Emissions in ZnSe Nanocrystals”, Pradhan, N.; Goorskey, D.; Thessing, J.; Peng, X., Am. Chem. Soc., 2005, 127, 17586-17587 (highlighted in Science as “Editor’s Choice”)
11. “Side Reactions in Controlling the Quality, Yield, and Stability of High Quality Colloidal Nanocrystals”, Chen. Y.; Kim, M.; Lian, G.; Johnson, M. B.; Peng, X. J. Am. Chem. Soc., 2005, 127(38), 13331-13337.
12. “Coupled and Decoupled Dual Quantum Systems in a Semiconductor Nanocrystal”, D. Battaglia, N. Mallette, X. Peng, J. Am. Chem. Soc., 2005, vol 127, p 10889-10897.
13. “Size Dependent Dissociation pH of Thiol-coated Cadmium Chalcogenides Nanocrystals”, J. Aldana, N. Mallette, X. Peng, J. Am. Chem. Soc., 2005, 127(8), 2496-2504.
14. “Bioreactive Surfaces Prepared via the Self-Assembly of Dendron Thiols and Subsequent Dendrimer Bridging Reactions,” Yang M., Tsang E.M.W., Wang Y.A., Peng X., Langmuir, (2005), 21(5), 1858-1865
15. “Spin Dynamics and Level Structure of Quantum-dot Quantum Wells,”Berezovsky, Jesse; Ouyang, Min; Meier, Florian; Awschalom, David D.; Battaglia, David; Peng, Xiaogang. Physical Review B: (2005), 71(8), 081309/1-081309/4
16. “Exciton radiative recombination in spherical CdS/CdSe/CdS Quantum-well Nanostructures,” Xu, J., Xioa, M., Battaglia, D., Peng, X., Appl. Phys. Lett., (2005), 87(4), 043107/1-043107/3.
8. “Super-stable, High-quality Fe3O4 Dendron-nanocrystals Dispersible in Both Organic and Aqueous Solutions,” Kim, M., Chen, Y., Liu, Y., Peng, X., Adv. Mater., (2005), 17(11), 1429-1432.
17. “Photoluminescence from Colloidal CdS-CdSe-CdS Quantum Wells,” Xu, J., Battaglia, D., Peng, X., Xiao, M., J. of the Opticla Soc. Of Am. B: Optical Physics, (2005), 22(5), 1112-1116.
18. “High Quality ZnSe and ZnS Nanocrystals Formed by Activating Zinc Carboxylate Precursors”, L. Li, N. Pradhan, Y. Wang, X. Peng, Nano Lett., vol 4, 2261-2264
19. “Size- and Shape-Controlled Magnetic (Cr, Mn, Fe, Co, Ni) Oxide Nanocrystals via a Simple and General Approach”, N. Jana, Y. Chen, X. Peng, Chem. Mater. 2004, vol 20, p. 3931-3935
20. “Environmental Effects on Photoluminescence of Highly Luminescent CdSe and CdSe/ZnS Core/Shell Nanocrystals in Polymer Thin Films” A. Nazzal, X. Wang, L. Qu, W. Yu, Y. Wang, X. Peng, M. Xiao, J. Phys. Chem., 2004, vol 108, p 5507
21. “In Situ Observation of the Nucleation and Growth of CdSe Nanocrystals”, L. Qu, W. Yu, X. Peng, Nano Lett., 2004, vol 4, p5507
22. "Photocatalytic activity of gold nanocrystals and its role in determining the stability of surface thiol monolayers”, J. J. Li, X. Peng, J. Nanoscience & Nanotechnology, 2004, vol 6, p. 565-568. (invited)
23. “Single-Phase and Gram-Scale Synthesis of Au and Other Noble Metal Nanocrystals”, N. R. Jana, X. Peng, J. Am. Chem. Soc., 2003, vol 125, p 14280.
24. “Colloidal Two-Dimensional Systems, CdSe Quantum Shells and Wells”, D. Battaglia, J. J. Li, Y. Wang, X. Peng, Angew. Chem. Int. Ed., 2003, vol 43, p 5035.
25. “Large-Scale Synthesis of Nearly Monodisperse CdSe/CdS Core/Shell Nanocrystals Using Air-Stable Reagents via Successive Ion Layer Adsorption and Reaction.” J. Li, Y. A. Wang, W. Guo, J. C. Keay, T. D. Mishima, M. B. Johnson, X. Peng. J. Am. Chem. Soc., 2003, vol 125, p 12567.
26. “Luminescent CdSe/CdS Core/Shell Nanocrystals in Dendron Boxes: Superior Chemical, Photochemical and Thermal Stability”, W. Guo, J. Li, Y. A. Wang, X. Peng, J. Am. Chem. Soc., 2003, vol 125, p 3901 (highlighted as a “heart cut item” in the ACS website)
27. “Photoluminescence upconversion in colloidal CdTe quantum dots”, X. Wang, W. Yu, J. Zhang, J. Aldana, X. Peng, M. Xiao, Phys. Rev. B: 2003, vol 68, p 125318.
28. 1 “Formation and Stability of Size-, Shape-, and Structure-Controlled CdTe Nanocrystals: Ligand Effects on Monomers and Nanocrystals”, W. W. Yu, Y. A. Wang, X. Peng, Chem. Mater. 2003, p 4300.
29. “Photon-Activated CdSe Nanocrystal Nanosensors for Gases”, A. Nazzal, L. Qu, M. Xiao, X. Peng, Nano letters, 2003, vol 3, p 819
30. “Nanocrystal in dendron-box: a versatile solution to the chemical, photochemical, and thermal instability of colloidal nanocrystals” Comptes Rendus Chimie, 2003, p 989. (invited)
31. “Mechanisms of Shape Control and Shape Evolution of Colloidal Nanocrystals”, Peng, x., Adv. Mater., 2003, vol 15, p 459. (invited)
32. “Evaluation of nonlinear optical properties of cadmium chalcogenide nanomaterials”, Ceo, J. T.; Yang, Q.; Creekmore, S.; Temple, D.; Qu, L.; Yu, W.; Wang, A.; Peng, X.; Mott, A.; Namkung, M.; Jung, S. S.; Kim, J. H. Physica E: 2003, vol 17, p 101.
33. “Experimental determination of the size Dependent Extinction Coefficients of High Quality CdTe, CdSe and CdS nanocrystals”, W. Yu, L. Qu, W. Guo, X. Peng, Chem. Mater., 2003, vol 15, p 2845.
34. “Conjugation Chemistry and Bio-Applications of Semiconductor Box-Nanocrystals Prepared via Dendrimer-Bridging” W. Guo, J. Li, Y. A. Wang, X. Peng, Chem. Mater., 2003, vol 15, p 3125.
35. "Surface-related emission in highly-luminescent CdSe quantum dots”, Wang, X.; Qu, L.; Zhang, J.; Peng, X.; and Xiao, M., Nano Letters, 2003, vol 3, p 1103.
36. “Formation of High Quality CdS and Other II-VI Semiconductor Nanocrystals in Non-Coordinating Solvent, Tunable Reactivity of Monomers”, Yu W., Peng X., Angew. Chem. Int. Ed., 2002, vol 41, p 2368 (Announced as a “hot paper” by the journal)
39. “Green Chemical Approaches toward High Quality Semiconductor Nanocrystals”, Peng X., Chem. Eu. J., 2002, vol 8, p 334 (invited concept article).
38. "Control of Photoluminescence Properties of CdSe Nanocrystals in Growth", Qu L., Peng, X., J. Am. Chem. Soc., 2002, vol 124, p 2049.
39. “Stabilize Inorganic Nanocrystals by Organic Dendrons”, Wang, Y. A., Li, J. J., Chen, H., Peng, X., J. Am. Chem. Soc., 2002, vol 124, p 2293.
40. “Nearly Monodisperse and Shape-Controlled CdSe Nanocrystals via Alternative Routes: Nucleation and Growth” Peng, Z.; Peng, X., J. Am. Chem. Soc., 2002, vol 124, p 3343.
41. “Formation of High Quality InP and InAs Nanocrystals in a Non-Coordinating Solvent”, D. Battaglia, Peng, X., Nanolett., 2002, vol 2, p1027
42. “Lattice contraction in free-standing CdSe nanocrystals”, J. Zhang, X. Wang, Min Xiao, L. Qu and X. Peng, Appl. Phys. Lett., 2002 vol 81, p 2076
43. “Future directions in solid state chemistry: report of the NSF-sponsored workshop”, Cava, Robert J.; et al., Progress in Solid State Chem., 2002, vol 30, p 1.
44. “Photoluminescence from single CdSe quantum rods”, Chen, X.; Nazzal, Amjad Y.; Xiao, Min; Peng, Z. Adam; Peng, Xiaogang, J. Luminescence 2002, vol 97, p 205
45. “Synthesis of High Quality Cadmium Chalcogenides Semiconductor Nanocrystals Using CdO as precursor”, Peng Z. A., Peng X., J. Am. Chem. Soc., 2001, vol 123, p 168. (highlighted in C&En News)
46. “Mechanisms of the Shape Evolution of CdSe Nanocrystals”, Peng Z. A., Peng X., J. Am. Chem. Soc., 2001, vol 123, p 1389.
47. " Photochemical Instability of CdSe Nanocrystals Coated by Hydrophilic Thiols”, Aldana J., Wang, Y. A., Peng, X., J. Am. Chem. Soc., 2001, 123, p 8844.
48. “Alternative Routes toward High Quality CdSe Nanocrystals”, Qu, L., Peng Z. A., Peng X., Nano Lett., 2001, vol 1, p 333.
49.“Polarization Spectroscopy of Single CdSe Quantum Rods”, X. Chen, A. Nazzal, D. Goorskey and M. Xiao, Z. A. Peng and X. Peng, Phys. Rev. B., 2001, vol 64, p 245304.
50. “Spin spectroscopy of dark excitons in CdSe quantum dots to 60 T”, Johnston-Halperin, E.; Awschalom, D. D.; Crooker, S. A.; Efros, Al. L.; Rosen, M.; Peng, X.; Alivisatos, A. P., Phys. Rev. B, 2001, vol 63, p 205309/1
51. "Shape control of CdSe nanocrystals: from dots to rods and back”, Peng X., Mann L., Wickham J., Kadvanish A., Alivisatos A. P., Nature, 2000, vol 404, p 59
