کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
26493 | 43956 | 2014 | 10 صفحه PDF | دانلود رایگان |

• 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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Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 295, 1 December 2014, Pages 1–10