Photoelectrochemical behaviour of Q-state CdSxSe(1-x) particles in arachidic acid Langmuir-Blodgett films

Abstract

CdS Q-state particles, with mean diameters varying from 2 to 10 nm, grown in arachidic acid Langmuir-Blodgett (LB) films, have been exposed to H2Se(g) to form the corresponding Q-state CdSxSe(1-x) particles. These particles are considered to be made up of a core of CdS coated with about a monolayer of CdSe. Q-state CdSxSe(1-x) particle formation was verified by X-ray photoelectron spectroscopy (XPS) and by monitoring a red shift in the UV-VIS absorbance spectra relative to that of CdS. XPS results on 6 nm diameter CdS particles that had been grown in an LB film and then extensively exposed to H2Se(g), revealed a stable average composition of CdS0.4Se0.6. A study of the photoelectrochemical b..