Homogeneously alloyed CdSxSe1-x nanocrystals: synthesis, characterization, and composition/size-dependent band gap.

Swafford LA, Weigand LA, Bowers MJ, McBride JR, Rapaport JL, Watt TL, Dixit SK, Feldman LC, Rosenthal SJ
J Am Chem Soc. 2006 128 (37): 12299-306

PMID: 16967981 · DOI:10.1021/ja063939e

Alloy nanocrystals provide an additional degree of freedom in selecting desirable properties for nanoscale engineering because their physical and optical properties depend on both size and composition. We report the pyrolytic synthesis of homogeneously alloyed CdS(x)Se(1-x) nanocrystals in all proportions. The nanocrystals are characterized using UV-visible absorption spectroscopy, transmission electron microscopy, X-ray diffractrometry, and Rutherford backscattering spectrometry to determine precisely structure, size, and composition. The dependence of band gap on nanocrystal size and composition is elucidated, yielding a bowing constant of 0.29, in agreement with bulk values. In addition, the morphology of the resultant nanocrystals can be altered by changing the reaction conditions, generating structures ranging from homogeneous, spherical nanocrystals to one-dimensional gradient nanorods.

MeSH Terms (8)

Alloys Cadmium Compounds Nanoparticles Oxides Selenium Spectrophotometry, Ultraviolet Sulfur X-Ray Diffraction

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