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Simple, open air method to synthesize monodisperse and size selective PbSe quantum dots

Y. Pan, J. Lombardi
City College of New York, US

Keywords: PbSe, quantumn dots, open air synthesis

Abstract:

Simple, open air method to synthesize monodisperse and size selective PbSe quantum dots is reported here. PbCl2 complexed with oleylamine was used as the lead precursor. Se powder dissolved in 1-octadecene was used as the Se precursor. The size and shape of the PbSe quantum dots were controlled by changing injection temperature, precursor concentrations, reaction temperature, and reaction time to obtain the optimum synthetic conditions. The sizes of the PbSe nanoparticle quantum dots ranged from 5 nm to 15 nm. The shapes of the PbSe quantum dots were either spherical (< 9 nm) or cubic (> 9 nm). The as-synthesized colloidal PbSe quantum dots were characterized by transmission electron microscopy, high resolution transmission electron microscopy, selected area X-ray diffraction, energy-dispersive X-ray spectroscopy, and powder X-ray diffraction. The major contribution of this work is that the PbSe nanoparticle quantum dots synthesis is simplified with the new open air method, using less chemical reagents and eliminating the use of vacuum pump and nitrogen protection while obtaining the same quality of PbSe quantum dots.
 
 
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