Summary: Solid State Communications,Vol. 19, pp. 329--334, 1976. Pergamon Press. Printed in Great Britain
X-RAY PHOTOEMISSION STUDIES OF THIN GOLD FILMS
K.S. Liang, W.R. Salaneck and l.A. Aksay*
Xerox Webster Research Center, Webster, NY 14580, U.S.A.
(Received 30 October 1975 by J. Tauc)
The d-band and the core-level spectra of gold deposited on aluminium and
sapphire were investigated utilizing X-ray photoelectron spectroscopy (XPS).
For thin deposits of gold, the d-band splittingwas observed to be narrowed
significantly with respect to that of bulk gold. The narrowing effect is attribu-
ted to the high surface to bulk ratio of the gold deposits. A shift of Au 4f
core levels also occurs in correlation with the d-band effect.
1. INTRODUCTION 2. EXPERIMENT
THE ELECTRONIC structures of different forms of The substrates upon which gold was vapor deposited
gold, including pure solid, liquid, and alloyed phases, were chosen such that the interaction between the Sd
have been studied extensively using photoemission tech- electrons of gold and the substrate would be simple
4 The Sd portion of the valence band, which (gold on Al)5 or eliminated (gold on A1
2O3). The vapor
exhibits two distinctive peaks in the case of bulk gold, is deposition of Au onto sapphire (AI2O3) is well charac-
of particular interest. The splitting is commonly attribu- terized.