LAUSR

Abstract Solvothermal method by heating up approach in oleylamine was devised to prepare monodispersed Bi2S3 and Cu7S4 nanoparticles from novel dithiocarbmate complexes. The morphological and optical characterization of the as-prepared nanoparticles were carried out. The powder XRD of the Bi2S3 and Cu7S4 showed peaks assignable to orthorhombic phase of bismuthinite and monoclinic phase of anilite respectively. TEM micrographs of Bi2S3 and Cu7S4 revealed monodispersed nearly spherical morphology with an average crystallite sizes of 22.6 and 21.5 nm respectively. Lattice fringes observed in the high resolution TEM images confirmed the crystallinity of the nanoparticles. The respective band gap energies of the nanoparticles were obtained as Bi2S3 (1.5 eV) and Cu7S4 (2.4 eV), and the significant blue shift in their optical band gap energies could be ascribed to quantum confinement. The photoluminescence spectra of Bi2S3 showed emission maxima around 335 nm while that of Cu7S4 was around 298 nm.