Optical and AFM study of electrostatically assembled films of CdS and ZnS colloid nanoparticles |
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Authors: | Suryajaya A Nabok A Hassan J Evans-Freeman |
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Institution: | a Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield S1 1WB, UK b Cranfield Health, Cranfield University, Silsoe, Bedfordshire MK45 4DT, UK |
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Abstract: | CdS and ZnS semiconducting colloid nanoparticles coated with the organic shell, containing either SO3− or NH2+ groups, were prepared using the aqueous phase synthesis. The multilayer films of CdS (or ZnS) were deposited onto glass, quartz and silicon substrates using the technique of electrostatic self-assembly. The films produced were characterized with UV-vis spectroscopy, spectroscopic ellipsometry and atomic force microscopy. A substantial blue shift of the main absorption band with respect to the bulk materials was found for both CdS and ZnS films. The Efros equation in the effective mass approximation (EMA) theoretical model allowed the evaluation of the nanoparticle radius of 1.8 nm, which corresponds well to the ellipsometry results. AFM shows the formation of larger aggregates of nanoparticles on solid surfaces. |
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Keywords: | 73 61 Ga 78 20 Ci 78 67 Hc |
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