Facile Synthesis of Pbs, Bi2s3 and Bi-Doped Pbs Nanoparticles from Metal Piperidine Dithiocarbamates Complexes

Abstract

Lead and bismuth piperidine dithiocarbamate complexes have been synthesized and used as efficient precursors for synthesizing PbS and Bi 2 S 3 nanoparticles using hot injection techniques. The bismuth piperidine dithiocarbamate complex was then used as a dopant to form Bi-doped PbS nanoparticles. The p-XRD pattern of the PbS was indexed to a cubic rocksalt structure, whereas the Bi 2 S 3 was indexed to an orthorhombic structure. The morphological studies using the TEM revealed the formation of cubes and rods for the PbS and Bi 2 S 3, respectively. An interplay of these structures was observed for the alloy depending on the mole fraction of Bi doping in the injected precursor solution. The optical band gaps were blue-shifted to 0.72 and 1.94 eV for PbS and Bi 2 S 3, respectively. The Bi-doped PbS nanoparticles displayed optical band gaps in between the binary materials.

Keywords: Band gap, hot injection, single sourcr precursors, absorption, ternary alloy