Synthesis,Optical Spectroscopy and Ultrafast Electron Dynamics of PbS Nanoparticles with Different Surface Capping

摘要

Lead sulfide,PbS,nanoparticles have been synthesized using a number of surface capping agents including poly(vinyl-alcohol) (PVA),poly(vinyl-pyrrolidone) PVP,gelatin,DNA,polystyrene (PS),and poly(mathyl-mathacralet) (PMMA).The electronic absorption spectra and particle shapes have been found to depend on the capping molecules used.An excitonic feature at 580 nm was observed for capping with PVA and DNA,while no such excitonic feature was observed for PVP,PS or PMMA.