Preparation of PbS thin films: A new electrochemical route for underpotential deposition
Electrochimica Acta, vol.54, no.26, pp.6554-6559, 2009 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 54 Issue: 26
- Publication Date: 2009
- Doi Number: 10.1016/j.electacta.2009.06.056
- Journal Name: Electrochimica Acta
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.6554-6559
- Keywords: Co-deposition, Electrodeposition, Nanostructure, PbS, UPD
- Bilecik Şeyh Edebali University Affiliated: No
Abstract
Nanostructured thin films of lead sulfide have been synthesized by a new electrochemical approach based on the underpotential deposition (UPD) of Pb and S from the saturated solution of PbS containing excess of PbS particles as a source of Pb2+ and S2- at various temperatures. We have demonstrated that this new electrochemical route is a simple method with several advantages, including better control of the growth conditions and a one-step process to obtain the nanostructures of PbS. Scanning probe microscopy studies indicate that the growth of PbS nanofilms follows a two-dimensional layer-by-layer growth kinetics at the beginning of electrodeposition but a three-dimensional growth dominates after the formation of the first few layers. The results of morphological and structural investigations reveal that PbS nanostructures grown by this method are single-crystalline in cubic structure and have a preferential orientation along the [2 0 0] direction. The optical absorption spectra of PbS nanostructures show the blue-shift with respect to those of the bulk counterpart, which are attributed as quantum-size effect. © 2009 Elsevier Ltd. All rights reserved.