Electrochemical scanning tunneling microscope study of irreversibly adsorbed Te on a Pt(111) single crystal electrode surface

Authors
Citation
Ck. Rhee et Dk. Kim, Electrochemical scanning tunneling microscope study of irreversibly adsorbed Te on a Pt(111) single crystal electrode surface, J ELEC CHEM, 506(2), 2001, pp. 149-154
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN journal
1572-6657 → ACNP
Volume
506
Issue
2
Year of publication
2001
Pages
149 - 154
Database
ISI
SICI code
Abstract
Atomic STM images of the irreversibly adsorbed oxygenated Te layer and its reduced layer on Pt(lll) are presented. On the oxygenated Te layer, an atom ic image with an apparent (root2 x root2)(alpha = 80 degrees) unit cell was observed, which was interpreted to be a (2 x root3)rectangular structure c ontaining one Te atom and one O atom, i.e. theta (Tc) =0.25 and theta (O)=0 .25. This structural information, combined with the voltammetric charge (24 4 +/- 2.4 muC cm(-2)) concerning the redox process of the adsorbed Te layer , led to the conclusion that the chemical unit of the oxygenated Te layer i s TeO2+. The reduced layer of Te on Pt(111) was observed to show two differ ent structures of elemental Te: the (2 x 2) and (11 x 8) structures. The ob served elemental Te structures differed from those anticipated from the (2 x root3)rectangular structure of the oxygenated Te layer, implying the move ment of the Te atom during reduction of the oxygenated layer. It is conclud ed that the elemental Te atoms move laterally to form the (2 x 2) (theta (T c) = 0.25) and (11 x 8) (theta (Tc) = 0.284) structures. (C) 2001 Elsevier Science B.V. All rights reserved.