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

doi:10.1021/ja063939e

Homogeneously alloyed CdS_xSe_1-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

Rutgers University

Research output: Contribution to journal › Article › peer-review

276 Citations (Scopus)

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 CdS_xSe_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.

Original language	English
Pages (from-to)	12299-12306
Number of pages	8
Journal	Journal of the American Chemical Society
Volume	128
Issue number	37
DOIs	https://doi.org/10.1021/ja063939e
Publication status	Published - Sep 20 2006

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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Homogeneously alloyed CdS_xSe_1-x nanocrystals : Synthesis, characterization, and composition/size-dependent band gap. / Swafford, Laura A.; Weigand, Lauren A.; Bowers, Michael J.; McBride, James R.; Rapaport, Jason L.; Watt, Tony L.; Dixit, Sriram K.; Feldman, Leonard C.; Rosenthal, Sandra J.

In: Journal of the American Chemical Society, Vol. 128, No. 37, 20.09.2006, p. 12299-12306.

Research output: Contribution to journal › Article › peer-review

Swafford, Laura A. ; Weigand, Lauren A. ; Bowers, Michael J. ; McBride, James R. ; Rapaport, Jason L. ; Watt, Tony L. ; Dixit, Sriram K. ; Feldman, Leonard C. ; Rosenthal, Sandra J. / Homogeneously alloyed CdS_xSe_1-x nanocrystals : Synthesis, characterization, and composition/size-dependent band gap. In: Journal of the American Chemical Society. 2006 ; Vol. 128, No. 37. pp. 12299-12306.

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AU - McBride, James R.

AU - Rapaport, Jason L.

AU - Watt, Tony L.

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AB - 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.

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