Raman Stress Mapping of CdS Nanosheets

ORAL

Abstract

We present results of spatially-resolved room temperature second order Raman scattering measurements for single $\sim $3 micron wide CdS nanosheets. The sheets, grown by pulsed laser deposition using vapor-phase transport, are uniform in size and shape and exhibit hexagonal wurtzite structure. The orientation of the c-axis is determined by Raman polarization analysis. Spatially-resolved Raman scattering reveals a stress gradient across the nanosheets, with the 2LO phonon energy at the center of nanosheet being higher by $\sim $2~cm$^{-1}$ with respect to the edges which indicates that nanosheets are relaxed at the edges with a strain gradient toward the center. Support provided by NSF ({\#}0701703 and {\#}0806700), Korea Research Foundation and KIST.

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Authors

  • M. Montazeri

    • University of Cincinnati

  • J.M. Yarrison-Rice

    • University of Cincinnati

  • L.M. Smith

    • University of Cincinnati

  • H.E. Jackson

    • University of Cincinnati

  • H. Rho

    • Chonbuk National University

  • Y. Lee

    • Chonbuk National University

  • Y.J. Choi

    • Korea Institute of Science and Technology

  • J. Choi

    • Korea Institute of Science and Technology

  • J.G. Park

    • Korea Institute of Science and Technology