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Optical studies of chemically deposited PVA-capped PbS nanoparticle thin films

S. C. EZUGWU1, F. I. EZEMA1,* , R. U. OSUJI2, P. U. ASOGWA1, B. A. EZEKOYE1, A. B. C. EKWEALOR1, C. CHIGBO2, M. ANUSUYA3, M. MAHABOOB BEEVI3

Affiliation

  1. Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
  2. Enugu State University of Science and Technology, Enugu, Nigeria
  3. Trichy Engineering College, Trichy, Tamil Nadu, India

Abstract

PVA-capped PbS nanoparticle thin films were deposited by chemical bath deposition (CBD) method onto the glass substrate from an aqueous alkaline bath at room temperature. Lead nitrate and thiourea were used as Pb2+ and S2- ions sources, respectively. The optical studies of the films were carried out by optical absorption measurements using a double beam Perkin-Elmer UV-VIS Lambda 35 spectrometer in the wavelength range of 200 – 1000 nm. The calculated direct allowed band gap energy lies in the range of 2.3 – 2.6 eV. The crystallite size measured by XRD studies was found to be 31.45 nm.

Keywords

Optical properties, lead sulphide, thin films.

Citation

S. C. EZUGWU, F. I. EZEMA, R. U. OSUJI, P. U. ASOGWA, B. A. EZEKOYE, A. B. C. EKWEALOR, C. CHIGBO, M. ANUSUYA, M. MAHABOOB BEEVI, Optical studies of chemically deposited PVA-capped PbS nanoparticle thin films, Optoelectronics and Advanced Materials - Rapid Communications, 3, 6, June 2009, pp.528-532 (2009).

Submitted at: April 6, 2009

Accepted at: June 15, 2009