One-pot synthesis of monodisperse PbSe quantum dots and graphene oxide nanocomposites

Yi Pan, J.R. Lombardi
City College of New York, US

Keywords: one-pot synthesis, PbSe Quantum dots, graphene oxide, nanocomposite


A new, one-pot method to synthesize monodisperse PbSe quantum dots (QDs) and graphene oxide (GO) nanocomposites (GO-PbSeQDs) is reported here. PbCl2 complexed with oleylamine was used as the Pb precursor. Se powder dissolved in long chain alkenes was used as the Se precursor. Pb precursor, long chain alkene solution of Se, and GO were mixed together and heated to elevated temperatures; monodisperse GO-PbSeQDs nanocomposites were obtained by controlling the heating rate for the nucleation and growth of the nanocomposites. The as-synthesized colloidal GO-PbSeQDs nanocomposites were characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy, selected area X-ray diffraction, and energy-dispersive X-ray spectroscopy. This work demonstrates single layer monodisperse GO-QDs nanocomposites can be synthesized via a simple one-pot colloidal synthesis. This synthetic method can be extended to obtain reduced GO (RGO) and QDs nanocomposites (RGO-QDs). The large two-dimension flexible layer of GO provides easy control of the distribution of QDs on the GO sheet. The new nanocomposite materials may have great potential for fabricating optoelectronic devices.