Issue 2, 2009

Synthesis of lead chalcogenide nanoparticles in block copolymer micelles: investigation of optical properties and fabrication of 2-D arrays of nanoparticles

Abstract

Narrow band gap PbS and PbSe semiconductor nanocrystals were prepared in the poly(4-vinyl pyridine) core of self assembled polystyrene-block-poly(4-vinyl pyridine) copolymer micelles in toluene at room temperature, and characterized by high resolution-transmission electron microscopy and X-ray diffractograms. Optical absorption and photoluminescence (PL) studies of the nanocrystals showed the quantized phenomena. The PL intensity of the PbSe nanocrystals was strongly enhanced, with a slight red shift in the peak position, by treating with aqueous Na2S solution. Interestingly, the inclusion of ZnS amorphous nanoparticles into the P4VP/PbSe core leads to a large red shift in the peak position, which covers the technologically important range (1.3 to 1.55 µm), with strong enhancement of the emission intensity. We fabricated a monolayer thin film of PbSe nanocrystals by spin coating on a silicon wafer, and it showed similar PL behavior to that in solution.

Graphical abstract: Synthesis of lead chalcogenide nanoparticles in block copolymer micelles: investigation of optical properties and fabrication of 2-D arrays of nanoparticles

Article information

Article type
Paper
Submitted
14 Aug 2008
Accepted
16 Oct 2008
First published
14 Nov 2008

J. Mater. Chem., 2009,19, 280-285

Synthesis of lead chalcogenide nanoparticles in block copolymer micelles: investigation of optical properties and fabrication of 2-D arrays of nanoparticles

S. P. Anthony, W. J. Cho, J. I. Lee and J. K. Kim, J. Mater. Chem., 2009, 19, 280 DOI: 10.1039/B814157F

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