Homogeneously Alloyed CdSxSe1-x Nanocrystals: Synthesis, Characterization, and Composition/Size-Dependent Band Gap
| Autor: | Tony L. Watt, Lauren A. Weigand, Sandra J. Rosenthal, Laura A. Swafford, James R. McBride, Michael J. Bowers, Jason L. Rapaport, Leonard C. Feldman, S.K. Dixit |
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| Rok vydání: | 2006 |
| Předmět: |
Absorption spectroscopy
Band gap Chemistry Analytical chemistry Oxides General Chemistry Rutherford backscattering spectrometry Biochemistry Catalysis Characterization (materials science) Selenium Colloid and Surface Chemistry X-Ray Diffraction Nanocrystal Chemical engineering Transmission electron microscopy Alloys Cadmium Compounds Nanoparticles Spectrophotometry Ultraviolet Nanorod Pyrolytic carbon Sulfur |
| Zdroj: | Journal of the American Chemical Society. 128:12299-12306 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja063939e |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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