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  English.dicp.cas.cn    Posted:2013-10-29
Electron Stimulated Desorption (ESD) - A Probe to Study the Surface Chemistry Processes on TiO2(110)

Time: Nov. 1, 2013(Friday ), 9:30a.m. 

LocationConference Room of Basic Energy Science Building  

Lecturer: Dr. Zhen Zhang

Department of Chemistry, University of Virginia, USA 

Abstract:  

The ions and neutral species can be desorbed from the solid surfaces by electronic excitation. We use the desorbed species as sensitive probes to detect the surface chemistry on metal oxides. Rutile TiO2(110) has been chosen as a model oxide due to the wide applications of TiO2 in the fields of photoelectronics and photocatalysis. In this presentation, three desorbed species from TiO2(110) have been used as the probes: (1) O(lattice)+ ESD – A probe to study defect electron redistribution on TiO2(110) surface by H2O adsorption. (2) O(ad)+ ESD – A probe to study thermal chemistry on TiO2(110) surface. (3) O2 ESD – A probe to study photochemistry on TiO2(110) surface.    

Introduction 

EDUCATION: 

Ph. D., Physical Chemistry, December 2007, 

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences 

B.S., Chemistry, July 2001 

Department of Chemistry, Nanjing University, China 

RSEEARCH INTERESTS: 

Surface Science, Catalysis, Photocatalysis and Photochemistry, Metal Cluster, Metal 

Oxide, Electron-Stimulated Desorption, Photon-Stimulated Desorption  

RESEARCH EXPERIENCE:  

July 2011– present    Research Scientist 

March 2008 – July 2011   Research Associate 

Prof. John T. Yates group, Department of Chemistry, University of Virginia, USA 

l   Electron-stimulated positive-ion desorption caused by charge transfer from adsorbate to substrate: oxygen adsorbed on TiO2(110) 

l   Unraveling the diffusion of bulk Ti interstitials in rutile TiO2(110) by monitoring their reaction with O adatoms 

l   Direct observation of surface-mediated electron-hole pair recombination in TiO2(110) 

l   Electron-mediated CO oxidation on the TiO2(110) surface during electronic excitation 

l   Band bending and photocatalysis/photochemistry 

l   The behavior of H on the TiO2(110) surface  

September 2001 – December 2007, Ph.D. student 

Prof. Xinhe Bao group, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences 

Dissertation title: Construction and Characterization of Si(111)-7×7-Based Model Catalysts 

l     Set up and maintained an Omicron multiprobe surface analysis system 

l  Mastered surface analysis techniques such as XPS, UPS, ISS, HREELS, PEEM, and STM 

l  Fabricated well-ordered metal nanoclusters (quantum dots) and nanofilms (quantum well films) on Si(111)-7×7 surfaces as the model catalysts 

l  Studied chemisorption and catalytic reactions on model catalyst surfaces to understand the relationship between surface structure and catalytic activity 

l  Prepared well-ordered silica and Ag films on Pd(100) surfaces 

August 2002 – June 2003, visiting student during Ph.D. 

Prof. Qikun Xue group, State Key Laboratory for Surface Physics, Institute of Physics, the Chinese Academy of Sciences 

l  Mastered STM, MBE, UHV techniques 

l  Fabricated site-specific and size-controllable Ag nanoclusters on Al/Si(111) surfaces 

ContractGroup 502 Ying Shi9128
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