Controlled Synthesis of Tuned Bandgap Nanodimensional Alloys of PbSxSe1鈭?i>x
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- 作者：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鈥橞rien
- 刊名：Journal of the American Chemical Society
- 出版年：2011
- 出版时间：April 13, 2011
- 年：2011
- 卷：133
- 期：14
- 页码：5602-5609
- 全文大小：1097K
- 年卷期：v.133,no.14(April 13, 2011)
- ISSN：1520-5126
文摘
Truly alloyed PbSxSe1鈭?i>x (x = 0鈭?) 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鈥檚 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.