Band bending effect induced non-enzymatic highly sensitive glucose sensing in ZnO nanoparticles

We report band bending effect assist the enhancement of green fluorescence in ZnO nanoparticles surrounded by glucose molecules. Optical absorption measurements show free exciton absorption of ZnO around 377nm and consistent decrease in absorption intensity while adding glucose. Room temperature pho...

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Bibliographic Details
Published in:Journal of luminescence 2017-03, Vol.183, p.1-6
Main Authors: Hariharan, S., Karthikeyan, B.
Format: Article
Language:English
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Summary:We report band bending effect assist the enhancement of green fluorescence in ZnO nanoparticles surrounded by glucose molecules. Optical absorption measurements show free exciton absorption of ZnO around 377nm and consistent decrease in absorption intensity while adding glucose. Room temperature photoluminescence study under excitation at 330nm shows very strong emission in the ultra violet (UV) and visible wavelength regions. Enhancement in green emission intensity is observed while increasing concentration of glucose from 60 to 480nM, which is attributed for decreasing depletion layer width near the surface as a result of electrons donating by glucose. Recorded time resolved emission spectra of prepared nanoparticles in the presence and absence of glucose proves that there is no energy transfer process occurs during ZnO-glucose interaction and the enhanced green emission are due to glucose molecules adsorbed on the surface of ZnO which can be applied for non-enzymatic glucose sensing applications. [Display omitted]
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2016.10.046