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Controlled Synthesis of Tuned Bandgap Nanodimensional Alloys of PbSxSe1−x

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journal contribution
posted on 13.04.2011, 00:00 by 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 O’Brien
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 Vegard’s 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.