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Paper detail

Optical Emission Based Oxygen Sensing by ZnO Nanoparticles

ZnO nanoparticles (NP) of size less than around 20 nm inside a chamber exhibits complete reduction in their visible photoluminescence (PL) intensity when partial pressure of oxygen in the surrounding gaseous environment is decreased by evacuation. However the visible PL from ZnO nanoparticles are insensitive to the gases like N2, He and Ar. The rate of change of PL intensity with pressure (or the sensitivity) is inversely proportional to the ambient air pressure. Sensitivity increases when surface to volume ratio increases for lower particle size. The charged oxygen vacancies are attributed as the responsible candidates for surface related visible PL from ZnO NP.

preprint2010arXivOpen access
Manoranjan GhoshR S NingthoujamR. K. VatsaD. DasV. NatarajuS. K. GuptaD. Bahadur
cond-mat.mtrl-sci
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Manoranjan GhoshR S NingthoujamR. K. VatsaD. DasV. NatarajuS. K. GuptaD. Bahadur

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