Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 37, Issue 4, Pages 628-633Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/37/4/014
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CdS-ZnO nanocomposite thin films were prepared using the sol-gel technique. Highly confined nanoparticles of US (radius 1.8-4.7 nm) were obtained with ZnO as the matrix. The molar ratio of US and ZnO was varied within the range 20 : 80 to 60 : 40. The influence of the annealing temperature (373-573 K) on the particle size was studied from the blue shift (0.1-0.7 eV) of the absorption edge and transmission electron microscopy. The microstructural characterization by high resolution transmission electron microscopy indicated well-resolved crystalline nanoparticles. Photoluminescence studies indicated three surface related peaks at 2.33, 2.19 and 1.89 eV for all the CdS-ZnO nanocomposites. The optical band gap (E,) determined without preassuming the nature of the optical transition varied in the range 2.52-3.16 eV with variation of the annealing temperature, showing excellent carrier confinement of the US nanoparticles within the wide band gap ZnO matrix. This study indicated ZnO to be a good capping material for CdS nanoparticles.
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