کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
26493 43956 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nano ZnO, Cu-doped ZnO, and Ag-doped ZnO assisted generation of light from imidazole
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Nano ZnO, Cu-doped ZnO, and Ag-doped ZnO assisted generation of light from imidazole
چکیده انگلیسی


• 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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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 295, 1 December 2014, Pages 1–10
نویسندگان
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