Size dependent optical properties in ZnO nanosheets

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Resumen

Photoluminescence (PL), scanning electronic microscopy (SEM) and Raman scattering have been studied in crystalline ZnO nanosheets with different sizes after the thermal annealing at 400 °C for 2 hours in ambient air. ZnO nanosheets were created by the electrochemical (anodization) method using the variation of the etching durations with obtained ZnO nanosheet sizes from the range 40-360 nm. Earlier it was shown using the X ray diffraction (XRD) method that thermal annealing performed the ZnO oxidation and crystallization with the creation of the wurtzite crystal lattice. Four PL bands are revealed in PL spectra with the PL peaks at 1.60, 2.08, 2.50 and 3.10 eV. Size decreasing of ZnO nanosheets stimulates tremendous changes of ZnO optical parameters. It is shown that decreasing the ZnO nanosheet sizes is accompanied by the intensity increase of a set of Raman peaks and the surface defect related PL bands. The reasons of emission transformation and the nature of optical transitions have been discussed as well.

Idioma originalInglés
Páginas (desde-hasta)95-100
Número de páginas6
PublicaciónMaterials Research Society Symposium Proceedings
Volumen1617
DOI
EstadoPublicada - 2013
Evento22nd International Materials Research Congress, IMRC 2013 - Cancun, México
Duración: 11 ago. 201315 ago. 2013

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