Preparation, Optical Spectroscopy, and Electrochemical Studies of Novel π-Conjugated Polymer-Protected Stable PbS Colloidal Nanoparticles in a Nonaqueous Solution

Abstract

A stable colloidal form of novel π-conjugated polydithiafulvene (PDF)-protected PbS nanoparticles was first prepared in a nonaqueous solution at room temperature. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) images demonstrated that the synthesized PbS nanoparticles of stable colloidal form were of cubic rock-salt structure with narrow size distribution. The average diameters of PDF-protected PbS nanoparticles were controllable by varying the initial concentrations of the lead and sulfur sources in the reaction systems. The absorption spectra and electrochemical properties of the protected PbS nanoparticles have been investigated. It was found that the PDF influenced strongly the excitonic absorption peaks of the protected PbS nanoparticles.