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

Laura A. Swafford, Lauren A. Weigand, Michael J. Bowers, James R. McBride, Jason L. Rapaport, Tony L. Watt, Sriram K. Dixit, Leonard C. Feldman, Sandra J. Rosenthal

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Abstract

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 CdSxSe1-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.

Original languageEnglish
Pages (from-to)12299-12306
Number of pages8
JournalJournal of the American Chemical Society
Volume128
Issue number37
DOIs
Publication statusPublished - Sep 20 2006

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Swafford, L. A., Weigand, L. A., Bowers, M. J., McBride, J. R., Rapaport, J. L., Watt, T. L., Dixit, S. K., Feldman, L. C., & Rosenthal, S. J. (2006). Homogeneously alloyed CdSxSe1-x nanocrystals: Synthesis, characterization, and composition/size-dependent band gap. Journal of the American Chemical Society, 128(37), 12299-12306. https://doi.org/10.1021/ja063939e