Resumen de One pot synthesis of PbS/Cu_(2)S core-shell nanoparticles and their optical properties
The synthesis of PbS/Cu_(2)S core-shell nanoparticles with emission on the visible range and with improved luminiscence properties was carried out by the colloidal solution-phase growth method by using simple stabilizers such as trisodium citrate and 3-mercaptopropionic acid. The core shell arrangement for particle swith different crystalline structure was achieved, in addition this is the first report related to the synthesis PbS/Cu_(2)S core-shell system. The data obtained from absorption spectra, PL spectra, and HRTEM image provided direct proof of the formation of PbS core with size arounf 11 nm and Cu_(2)S shell of 5 nm thickness. According to the UV-vis absorption and PL spectrum, the pure PbS nanoparticles. The QY was improved en 15% from PbS to PbS/Cu_(2)S nanoparticles. The stimated band (HOMO-LUMO) alignment determined by CV measurements corresponds to a type-I core shell arrangement.
