Abstract

Interactions between carbon and oxygen on glass surfaces under heat treatments have been observed in x-ray photoelectron spectroscopy (XPS) measurements. The reactions of carbon and oxygen on surfaces were monitored by the binding energies of photoelectrons emitted from 1s states of carbon and oxygen. A single XPS C_1s peak was broadened and two peaks were clearly resolved after the sample was silica heated above 250°C. These two-component carbon peak positions were analyzed through the curve fitting technique. Not only the ratio of high-binding and low-binding peaks of C_1s but also the relative peak positions were changed with the sample temperature and the period of heat treatment. Comparison studies on the oxygen 1s peak also showed the development of two component peak. The relative concentrations of two peaks changed with sample temperature and the duration of heat treatment. The two-component peaks appeared in C_1s as well as in O_ls′ which strongly indicates that bonds between carbon and oxygen are formed during sample heating.

© 1992 Optical Society of America