Controlled synthesis of tuned bandgap nanodimensional alloys of PbS xSe1-x

Javeed Akhtar, Mohammad Afzaal, Mateusz Banski, Artur Podhorodecki, Marcin Syperek, Jan Misiewicz, Ursel Bangert, Samantha J.O. Hardman, Darren M. Graham, Wendy R. Flavell, David J. Binks, Sandra Gardonio, Paul Obrien

Research output: Contribution to journalArticlepeer-review

Abstract

Truly alloyed PbSxSe1-x (x = 0-1) nanocrystals (∼5 nm in size) have been prepared, and their resulting optical properties are red-shifted systematically as the sulfur content of the materials increases. Their optical properties are discussed using a modified Vegards approach and the bowing parameter for these nanoalloys is reported for the first time. The alloyed structure of the nanocrystals is supported by the energy-filtered transmission electron microscope images of the samples, which show a homogeneous distribution of sulfur and selenium within the nanocrystals. X-ray photoelectron spectroscopy studies on ligand-exchanged nanocrystals confirmed the expected stoichiometry and various oxidized species.(Figure Presented)

Original languageEnglish
Pages (from-to)5602-5609
Number of pages8
JournalJournal of the American Chemical Society
Volume133
Issue number14
DOIs
Publication statusPublished - 13 Apr 2011

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