Electrical and Photoelectrochemical Characterization of CdS Particulate Films by Scanning Electrochemical Microscopy, Sc
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ELECTRICAL AND PHOTOELECTROCHEMICAL CHARACTERIZATION OF CdS PARTICULATE FILMS BY SCANNING ELECTROCHEMICAL MICROSCOPY, SCANNING TUNNELING MICROSCOPY, AND SCANNING TUNNELING SPECTROSCOPY XIAO KANG ZHAO," LARRY McCORMICK,* AND JANOS H. FENDLER** *J&D Scientific, Inc., 1815 West 1st Avenue, Mesa, Arizona 85202 "Department of Chemistry, Syracuse University, Syracuse, New York 13244-4100 ABSTRACT Cadmium sulfide particulate films have been generated at monolayer interfaces. Controlled and slow infusion of hydrogen sulfide onto compressed monolayers prepared from cadmium arachidate resulted in the formation of covalent metal sulfide bonds at a large number of sites at the monolayer-aqueous interface. The initial nucleation resulted in the downward growth of well-separated, metal-sulfide microclusters which grew in height and width and coalesced into interconnected arrays of semiconductor particles. EXPERIMENTAL SECTION Using the STM tip as the working electrode (WE) in conventional potentiostatic experiments provided an opportunity to perform in situ electrochemical studies on CdS semiconductor particulate films formed at monolayer headgroup-aqueous subphase interfaces. The schematics of the electrochemical cell used for these experiments are illustrated in Figure 1. o#--WE 0--
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