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Nano ZnO, Cu-doped ZnO, and Ag-doped ZnO assisted generation of light from imidazole

Paper ID Volume ID Publish Year Pages File Format Full-Text
26493 43956 2014 10 PDF Available
Title
Nano ZnO, Cu-doped ZnO, and Ag-doped ZnO assisted generation of light from imidazole
Abstract

•ZnO surface enhances π electron delocalisation, lowers HOMO–LUMO energies due to adsorption.•Energy gap of MNDI-Cu–ZnO lowers compared to those of pristine ZnO and thus red shift.•Energy gap of MNDI-Ag–ZnO larger compared to that with ZnO and thus blue shift.•Shortening of decay time of MNDI indicates charge transfer from MNDI to nanocrystals.•∆Get −1.23 eV indicates thermodynamic feasibility of electron transfer process.

A sensitive 2-(4-methoxyphenyl)-1-(naphthalene-1-yl)-4,5-diphenyl-1H-imidazole (MNDI) fluorescent sensor for nanoparticulate ZnO has been designed and synthesized. The nanocrystalline ZnO, Cu-doped ZnO, and Ag-doped ZnO have been synthesised by sol–gel method and characterized by powder X-ray diffraction, scanning electron microscopy(SEM), UV–vis diffuse reflectance, photoluminescence and life time spectral studies. All the synthesized nanoparticles display violet emission due to charge carrier-recombination. The synthesized sensor emission is enhanced by nanocrystalline pristine ZnO but is suppressed by Cu-doped ZnO and Ag-doped ZnO nanoparticles. The suppression of fluorescence is more by copper than by silver doping.

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Keywords
SEM; EDX; Fluorescence; ZnO; XRD; DRS
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Nano ZnO, Cu-doped ZnO, and Ag-doped ZnO assisted generation of light from imidazole
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 295, 1 December 2014, Pages 1–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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