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No Access Submitted: 04 April 2007 Accepted: 25 June 2007 Published Online: 20 August 2007

  • Three-dimensional structure of CdX (X=Se,Te) nanocrystals by total x-ray diffraction

Journal of Applied Physics 102, 044304 (2007); https://doi.org/10.1063/1.2767615
S. K. Pradhana)
  • Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859
    • Z. T. Deng and F. Tang
  • Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China
    • C. Wang
  • Key Laboratory of Molecular Engineering of Polymers (Minister of Education), Fudan University, Shanghai 200433, China and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
    • Y. Ren
  • Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
    • P. Moeck
  • Department of Physics, Portland State University, Portland, Oregon 97207
    • V. Petkovb)
  • Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859
    • more...View Affiliations

    • a)On leave from Department of Physics, The University of Burdwan, Golapbag, Burdwan-713104, West Bengal, India.

      b)Author to whom correspondence should be addressed; electronic mail: [email protected]

    View Contributors
    • S. K. Pradhan
    • Z. T. Deng
    • F. Tang
    • C. Wang
    • Y. Ren
    • P. Moeck
    • V. Petkov
    ABSTRACT
    The three-dimensional structure of oleic acid-capped CdSe and thiol-capped CdTe nanocrystals used as quantum dots has been determined by total synchrotron radiation x-ray diffraction and atomic pair distribution function analysis. Both CdSe and CdTe are found to exhibit the zinc-blende-type atomic ordering. It is only slightly distorted in CdSe implying the presence of nanosize domains and very heavily distorted in CdTe due to the presence of distinct core-shell regions. The results well demonstrate the great potential of the experimental approach and thus encourage its wider application in quantum dot research.

    ACKNOWLEDGMENTS

    The work was supported by NSF through Grant No. DMR 0304391(NIRT) and CMU through Grant No. REF C602281. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. One of the authors (C.W.) is grateful to the support of National Science Foundation for Distinguished Young Scholars of China (50525310).

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