Optical and AFM study of electrostatically assembled films of CdS and ZnS colloid nanoparticles

NABOK, A. V., DAVIS, F., HASSAN, A. K., HIGSON, S. P. J. and EVANS-FREEMAN, J. H. (2008). Optical and AFM study of electrostatically assembled films of CdS and ZnS colloid nanoparticles. Applied Surface Science, 254 (15), 4891-4898.

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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. (C) 2008 Elsevier B.V. All rights reserved.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:	https://doi.org/10.1016/j.apsusc.2008.01.134
Page Range:	4891-4898
Depositing User:	Ann Betterton
Date Deposited:	30 Mar 2010 16:07
Last Modified:	18 Mar 2021 21:30
URI:	https://shura.shu.ac.uk/id/eprint/1453

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