Ph. D.; Physical Chemistry; Institute of Photographic Chemistry, Chinese Academy of Sciences, China; July 1998
1) The Excellent Prize of the President Scholarship of Chinese Academy of Sciences, 1998
2) Alexander von Humboldt Research Fellowship, July 1998
2) Member of Sigma Xi, the Scientific Research Society, since 2002;
3) Member of American Chemical Society, since 2003;
4) Reviewer for Journal of Colloid and Interface Science, 1999;
5) Reviewer for Langmuir, 2003, 2004;
6) Reviewer for Journal of Solid State Chemistry , 2004;
7) Reviewer for Journal of Physical Chemistry, 2004;
8) Reviewer for Thin Solid Film , 2004.
1) November 2000-------now
Research Associate, Department of Chemistry, Tufts University (Supervisor: Prof. Shultz)
2) March 2000 ------ Sept. 2000
Alexander von Humboldt Research Fellow, Free University Berlin, Germany (co-workers: Prof. Dr. J. K. Dohrmann and Prof. Dr. Bahnemann)
3) April 1999----- February 2000
Alexander von Humboldt Research Fellow, "Institut fuer Solarenergieforschung (ISFH)" in Germany (co-worker: Prof. Dr. Bahnemann)
4) Nov. 1998----- March 1999
German language training at "Goethe-Institut" of Bremen supported by Alexander von Humboldt (AvH) Foundation (pass the language level test of "ZDaF")
5) July 1998 ------ Nov. 1998
Research Associate, Institute of Photographic Chemistry, Chinese Academy of Sciences
6) Aug. 1994 ------- July 1998
Ph.D. candidate, Institute of Photographic Chemistry, Chinese Academy of Sciences (Supervisors: Prof. Chunyan Liu and Prof. Tao Shen)
7) Sep. 1993 ----- July 1994
Graduate student at Dept. of Chem., Graduate School of Chinese Academy of sciences and The University of Science and Technology of China (USTC)
Key words: Surface Chemistry and Photochemistry of Nanoparticles; Synthesis and Characterization of Nanoparticles; Electron Transfer Reactions at the Interface of Nanoparticles and Liquids; Photosensitization; Heterogeneous Catalysis; Photocatalysis and Environmental Chemistry; Molecular Spectroscopy; Nonlinear Optical Spectroscopy.
1) Nanoparticles------Novel Materials
Nanoscience and nanotechnology promise to have major implications for health, wealth, and peace in the coming decades. Since 1994 I have focused on this field, concentrating on nanometer sized metals (Pt, Au, Ag), semiconductors (TiO2, Fe2O3) and the composites (Au/TiO2, Pt/TiO2, Fe-Ti mixed oxides, Pt/Fe-Ti mixed oxides) including synthesis, structural characterization and probing properties. Relevant results have been published in leading journals such as Chemical Communication, Journal of Colloid & Interface Science, Journal of Materials Chemistry, etc.
2) Photocatalysis-----Enviromental Purification
In last 20 years photocatalytic degradation by means of semiconductors has drawn considerable attention because of global environmental problems. TiO2 is a most important photocatalyst. It has been widely used in photodegradation because of its stability and high efficiency relative to other catalysts, such as CdS, Fe2O3, ZnO. TiO2 photocatalysis is useful in many aspects like cleanup of water and air, selfcleaning windows and ceramics, etc. However, the photonic efficiency of TiO2 is still limited by two factors: absorption only in UV region and fast recombination of photogenerated charge carriers (electron and holes). My work mainly includes: (1) probe of photocatalysis used for photographic industry; (2) quantitative evaluation of various photocatalysts by determination of the quantum yields of hydroxyl radicals produced in photocatalysis systems; (3) Probe of primary charge carrier dynamics at photocatalysts; (4) modification of photocatalysts by metal clusters deposition and metal ions doping. Most of results have been published in journals such as Chemical Communication and Journal of Photochemistry and Photobiology A-Chemistry, etc.
3) Photoinduced Interface Electron Transfer-----Solar Cell and Photographic Technology
Solar cells have attracted much attention because of the unlimited energy source-the Sun. The use of high surface area semiconductors has recently led to remarkable improvements in the efficiency of solar cells and allowed the use of simple and inexpensive semiconductors such as TiO2. Since TiO2 is white (i.e., it absorbs in the ultraviolet but not in the visible), and efficient collection of the solar spectrum requires sensitization by a molecule like dye absorbing in the visible. Likewise, dye photosensitization is also employed in AgX photographic developing process. From a chemical point of view, the photosensitization is based on interface electron transfer(ET). By using fluorescence spectroscopy, time-resolved transient absorption we observed that ET occurred in systems of dye/TiO2, dye/Ag and dye/AgX. Results have been published in professional photochemistry and imaging journals such as Journal of Photochemistry and Photobiology A, Imaging Science Journal and Journal of Imaging Science and Technology.
4) Nonlinear Optical Spectroscopy (SERS and SFG) ---Powerful Surface and Interface Analysis
Surface enhanced Raman scattering spectroscopy has been developed into a useful surface analysis tool since 1974 when it was first found by Fleishmann et al. We systematically investigated SERS for various materials on silver sol including simple ions like SCN-, complicated organics like porphrins, and nanoparticles like TiO2, where mechanisms, affecting factors and surface reactions were probed. Results have been published in journals specified in the field of surface and spectroscopy like Spectrochimica Acta A and Applied Surface Science.
Sum frequency generation (SFG) is a second order process, which is inherently interface sensitive because the sencond order susceptibility is zero in centrosymmetrical media (noble metals, aqueous solutions, etc). Only the surface and the interface where the symmetry is broken contribute to the second order non-linear processes. It makes SFG/DFG efficient for probing the surface and interface. Since 2000, I have been entering into this field. My emphasis is placed on SFG from nanoparticulate TiO2 films. By means of SFG, the reversible wettability by UV, two adsorption modes of methanol, and feature of hydroxyl groups on the TiO2 surface are first well rationalized. The results have been published in top journals in the field of physical chemistry, Langmuir and Journal of Physical Chemistry B.
A: Articles in Journals
Chuan-yi Wang, Henning Groenzin and Mary Jane Shultz: Adsorption of Methanol onto the Surface of Nanoscale Titanate Film Studied in Situ by Sum Frequency Generation: Thermodynamic Features, in preparation.
B: Contributions to Books
1. Chuanyi Wang and Chunyan Liu: Supported Metal Clusters, in Encyclopedia of Surface and Colloid Science, Arthur Hubbard, Santa Barbara Eds, Marcel Dekker, NY, p4581-4601, April, 2002.
C: Contributions to Conferences
1. Wang, Chuan-yi; Groenzin, Henning; Shultz, Mary Jane. Reversible wetting unveiled: Surface-specific detection with sum frequency generation. Abstracts of Papers, 227th ACS National Meeting, Anaheim, CA, United States, March 28-April 1, 2004 (2004), COLL-378. CODEN: 69FGKM AN 2004:223980 CAPLUS
2.
Wang, Chuan-yi; Groenzin, Henning; Shultz, Mary Jane. Competitive adsorption: Water and methanol on TiO2 detected by sum frequency generation. Abstracts of Papers, 227th ACS National Meeting, Anaheim, CA, United States, March 28-April 1, 2004 (2004), COLL-049. CODEN: 69FGKM AN 2004:223652 CAPLUS3. Mary Jane Shultz, Chuan-yi Wang and Henning Groenzin: Methanol as a molecular probe of the active sites on the wide band gap semiconductor TiO2. Abstracts of Papers, 226th ACS National Meeting, New York, NY, United States, September 7-11, 2003: p. COLL-129.
4. Henning Groenzin, Chuan-yi Wang and Mary Jane Shultz: Surface characterization of nanoparticulate anatase TiO2 film at molecular level by using vibrational Sum-Frequency-Generation spectroscopy. Abstracts of Papers, 226th ACS National Meeting, New York, NY, United States, September 7-11, 2003: p. COLL-208.
5. Chuan-yi Wang, Henning Groenzin and Mary Jane Shultz: Surface Characteristics of TiO2 Probed by Sum-Frequency Generation. Gordon Research Conference on Dynamics at Surfaces. Proctor Academy, Andover, NH. August 10-15, 2003.
6. Henning Groenzin, Chuan-yi Wang and Mary Jane Shultz: Detection of Surface OH-Groups and Contaminating Organic Layers on TiO2 by Sum-Frequency Generation (SFG). Gordon Research Conference on Dynamics at Surfaces. Proctor Academy, Andover, NH. August 10-15, 2003.
7. Chuanyi Wang; D. Bahnemann and J. K. Dohrmann: Effect of preparation methods on the photocatalytic activity of colloidal Fe(III)-doped TiO2, 10th IACIS international conference on colloidal and surface science, Bristol, U. K. July 23-28, 2000.
8. Chuanyi Wang; D. Bahnemann and J. K. Dohrmann: Effect of Deposition of Pt clusters on the quantum yield of HCHO formation in the presence of nanometer sized TiO2, European Research Conference on Cluster-Surface Interactions, Castelvecchio Pascoli, Italy, June 24-29 2000.
9. Chuanyi Wang; D. Bahnemann and J. K. Dohrmann: Determination of photonic efficiency and quantum yield of formaldehyde formation in the presence of various TiO2 photocatalysts, 2nd international conference: oxidation technologies for water and wastewater treatment, Clausthal-Zellerfeld/Germany, May 28-31, 2000.
10. Chuan-yi Wang; Chun-yan Liu; Zhi-ying Zhang and Liu Yun. Surface Enhanced Raman Scattering Effect from TiO2/Ag Nanoparticles. The 4th National Scientific Discussions on Fine Particles, Tsinghua, Beijing, Oct. 7-9, 1998, p67-71.
11. Chuanyi Wang; Chunyan Liu. Deposition of Ag Clusters on TiO2 and Accompanying Optical Effects, International Congress on Imagin Science (ICPS 98), University of Antwerp, Belgium, September 7-11, 1998, paper number: TR1-323, page416-419.
12. Chuanyi Wang; Chunyan Liu. Characterization and Microstructure of Au Clusters Supported on TiO2, International Congress on Imagin Science (ICPS 98), University of Antwerp, Belgium, September 7-11, 1998, paper number: TR1-155, p404-408.
13. Chun-yan Liu; Zhi-ying Zhang; Chuan-yi Wang; Xi-yi Chen; Jun Yue. The Interaction of Nanostructured AgCl Particles and Dyes: Microenvironmental Effects. International Congress on Imagin Science (ICPS 98), University of Antwerp, Belgium, September 7-11, 1998, TR1-71, p182-186.
14. Chuanyi Wang; Chunyan Liu and Tao Shen, Photosensitization of Colloidal TiO2 Particles by a Squaraine Dye. The Fourth Sino-Japan Binational Symposium on Photochemistry, Huangshan, China, October 1997, p209-210.
15. Chunyan Liu; Xiyi Chen; Chuanyi Wang, Synthesis of Silver Halide Particles and Spectral Sensitization in Reverse Micelles, The 5th National Symposium on Photographic Science, Huangshan, China, October 1997, p69-70.
16. Chuanyi Wang; Chunyan Liu, etc, Investigation on behavior of two porphyrin derives on the surface of silver sol. The 9th National Symposium on Photochemistry, Chongqin, China, November 1995, p110-111.
17. Chuan-yan Liu; Chuan-yi Wang; Xin-min Ren. Photocatalytic reaction of phenylmercaptotetrazole on TiO2 dispersion. IS&T’s Annu. Conf., Final Program Adv. Print. Pap., 48th (1995), 252-4.
