Valence band and core-level analysis of highly luminescent ZnO nanocrystals for designing ultrafast optical sensors

Details Valence band and core-level analysis of highly luminescent ZnO nanocrystals for designing ultrafast optical sensors Valence band and core-level analysis of highly luminescent ZnO nanocrystals for designing ultrafast optical sensors

2010-05-14

arxiv.org/abs/1005.2468v1

Appl. Phys. Lett. Vol 96, 123102 (2010)

Physics

Condensed Matter

Materials Science

10 Pages, 5 Figures

Scientific paper

10.1063/1.3354025

Highly luminescent ZnO:Na nanocrystals of size ~2 nm were synthesized using a improved sol-lyophilization process. The surface analysis such as survey scan, core-level and valence band spectra of ZnO:Na nanocrystals were studied using x-ray photoelectron spectroscopy (XPS) to establish the presence of Na+ ions. The observed increase in band gap from 3.30 (bulk) to 4.16 eV (nano), is attributed to the quantum confinement of the motion of electron and holes in all three directions. The photoluminescence and decay measurements have complemented and supported our study to design an efficient and ultrafast responsive optical sensing device.

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