Pressure-induced phase transition in hydrothermally grown ZnO nanoflowers investigated by Raman and photoluminescence spectroscopy

Journal of Physics. Condensed Matter : an Institute of Physics Journal
M Junaid BushiriJuan Angel Sans

Abstract

This paper reports the pressure-dependent photoluminescence and Raman spectral investigation of hydrothermally synthesized ZnO nanoflowers at room temperature. Intrinsic near-band-edge UV emission from ZnO nanoflowers is monotonously blue-shifted under pressures up to 13.8 GPa with a pressure coefficient of 26 meV GPa(-1), and this pressure value is nearly 5 GPa above the transition pressure from the wurtzite to the rock salt phase for bulk ZnO. The Raman band corresponds to the wurtzite phase, the [Formula: see text] and [Formula: see text] modes were observed up to about 11 GPa from the spectra. The apparent discrepancy in the transition pressures as determined from photoluminescence and Raman studies suggests that it is a consequence of the gradual phase transition, in which the smallest nanoparticles are expected to remain in the wurtzite phase up to 13-15 GPa.

References

Mar 10, 2001·Science·Z W PanZ L Wang
Nov 15, 2012·ACS Applied Materials & Interfaces·Chan Woong NaJong-Heun Lee

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Citations

Oct 25, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Marta M AlvesMaria F Montemor

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