AVS 52nd International Symposium
    Applied Surface Science Monday Sessions
       Session AS-MoA

Paper AS-MoA10
Differential Charging of Nanoparticles on Oxide Surfaces as Determined by XPS with External Stimuli

Monday, October 31, 2005, 5:00 pm, Room 206

Session: Electron Spectroscopies
Presenter: S. Suzer, Bilkent University, Turkey
Authors: U.K. Demirok, Bilkent University, Turkey
I. Tunc, Bilkent University, Turkey
S. Suzer, Bilkent University, Turkey
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By recording the XPS spectra while applying external d.c. and/or pulsed voltage stimuli, it is possible to control the differential charging, and extract information related with dielectric properties of various surface structures. We have carried out a number of experiments to determine the charging/discharging behavior of various surface structures consisting of Au, Ag, and Pt (metallic), Titania (semiconductor), and Silica (dielectric) both as they are and also as Core-Shell type Nanoparticles using XPS with external voltage stimuli. Differences and similarities of these structures with respect to their chemical compositions, and also with respect to the form (d.c., pulsed, etc.) of the voltage stimuli applied, will be presented and discussed in detail.