Optical and microstructural characterization of CdS-ZnO nanocomposite thin films prepared by sol-gel technique

S. K. Panda, S. Chakrabarti, B. Satpati, P. V. Satyam, S. Chaudhuri

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

CdS-ZnO nanocomposite thin films were prepared using the sol-gel technique. Highly confined nanoparticles of CdS (radius 1.8-4.7 nm) were obtained with ZnO as the matrix. The molar ratio of CdS 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 (Eg) 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 CdS nanoparticles within the wide band gap ZnO matrix. This study indicated ZnO to be a good capping material for CdS nanoparticles.

Original languageEnglish
Pages (from-to)628-633
Number of pages6
JournalJournal of Physics D: Applied Physics
Volume37
Issue number4
DOIs
Publication statusPublished - 21 Feb 2004

Fingerprint Dive into the research topics of 'Optical and microstructural characterization of CdS-ZnO nanocomposite thin films prepared by sol-gel technique'. Together they form a unique fingerprint.

  • Cite this