Vinod Panchal et al 2008 J. Phys.: Condens. Matter 20 345224 doi:10.1088/0953-8984/20/34/345224
Vinod Panchal, Shankar Ghosh1, Smita Gohil, Nilesh Kulkarni and Pushan Ayyub
Show affiliationsWe present the first high pressure Raman study of nanocrystalline ZnO with different average crystallite sizes. The problem of low Raman signals from nanometer-sized particles was overcome by forming a nanocomposite of Ag and ZnO nanoparticles. The presence of the nanodispersed Ag particles leads to a substantial surface enhancement of the Raman signal from ZnO. We find that the elastic modulus of nanocrystalline ZnO shows a non-monotonic dependence on the crystallite size and suggest that the non-monotonicity arises from an interplay between the elastic properties of the individual grains and the intergranular region.
62.25.-g Mechanical properties of nanoscale systems
62.50.-p High-pressure effects in solids and liquids
78.30.-j Infrared and Raman spectra
81.40.Jj Elasticity and anelasticity, stress-strain relations
Condensed matter: electrical, magnetic and optical
Issue 34 (27 August 2008)
Received 11 June 2008, in final form 15 July 2008
Published 6 August 2008
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