Synthesis and characterization of PbS/ZnS core/shell nanoparticles by microwave method

摘要

PbS/ZnSnanoparticles were synthesized via colloidal and microwave methods. First PbS nanoparticles with size of 11 nm and absorption in the visible range with higher luminescent properties were generated by microwave method. Then PbS/ZnS nanoparticles were obtained when the PbS:ZnS ratio was kept to 1.0:0.1 during the synthesis, leading to nanoparticles with PbS core of 12 nm and shell of approximately 3 nm. PbS/ZnS nanoparticles present a dramatically increase of PL intensity, confirming the confinement of the PbS core. In this case, the synthesis by microwave method allows obtaining nanoparticles with enhanced optical characteristics than those of nanoparticles synthesized by colloidal method.