Electrical properties of Cadmium Sulfide quantum dots and polyaniline based nanocomposites

Abstract

In the present work, Cadmium Sulfide (CdS) Quantum Dots (QDs) and Polyaniline (PANI) based nanocomposites (CdS-PANI) with various weight percentages (1%, 5% and 15%) of CdS were synthesized and their morphological, structural, optical and electrical properties were studied in detail. Polyaniline was synthesized by oxidation polymerization method, CdS QDs were prepared by chemical reaction precipitation method and CdS-PANI nanocomposites were prepared by in-situ oxidation polymerization method. UV–Vis absorption spectroscopy was used to study band gap energy of CdS quantum dots, pure PANI, and CdS-PANI nanocomposites. Band gap of pure PANI was found to decrease with increasing the concentration of CdS quantum dots in PANI matrix. Temperature dependence D.C conductivity measurements depicted 1-D charge transport mechanism in pure PANI and its nanocomposites. It was further observed that D.C conductivity was increased with the increase in temperature and contents of CdS in CdS-PANI nanocomposites. A.C conductivity was increased with the increase in temperature and frequency, and content of CdS in CdS-PANI nanocomposites.