AVS 52nd International Symposium
    Surface Science Wednesday Sessions
       Session SS2-WeM

Paper SS2-WeM1
Reactivity of Oxygen on Au(111) in CO Oxidation

Wednesday, November 2, 2005, 8:20 am, Room 203

Session: Reactions on Metals & Oxides
Presenter: B.K. Min, Harvard University
Authors: B.K. Min, Harvard University
A.R. Alemozafar, Harvard University
D.S. Pinnaduwage, Harvard University
X. Deng, Harvard University
C.M. Friend, Harvard University
Correspondent: Click to Email
Characteristics of oxygen on Au(111) related to reactivity in carbon monoxide oxidation were investigated by X-ray photoelectron spectroscopy (XPS), high resolution electron energy loss spectroscopy (HREELS) and scanning tunneling microscopy (STM). Oxygen was deposited on the Au(111) surface between 200 K - 400 K via exposure to ozone. Depending on the adsorption temperature, different characteristics of oxygen (chemisorbed and oxidic) and surface morphologies were observed. The reactivity of the oxygen-covered Au(111) surface is strongly dependent on reaction temperature; highest reactivity is observed at 200 K. Additionally, oxygen deposited at 200 K is more reactive than oxygen deposited at 300 K and 400 K. These results suggest that both reaction temperature and characteristics of oxygen are important for the reactivity of Au(111) in carbon monoxide oxidation.