Graphene oxide/ZnO nanorods/graphene oxide sandwich structure: The origins and mechanisms of photoluminescence
| Autor: | Izeddine Zorkani, I. Boukhoubza, Mohammed Khenfouch, Anouar Jorio, M Achehboune, Bakang Moses Mothudi |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photoluminescence Graphene Band gap Mechanical Engineering Metals and Alloys Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Materials Chemistry Nanorod Crystallite Fourier transform infrared spectroscopy 0210 nano-technology Wurtzite crystal structure |
| Zdroj: | Journal of Alloys and Compounds. 797:1320-1326 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.04.266 |
| Popis: | In this paper, we present the structural and optical properties of Graphene oxide/ZnO nanorods/graphene oxide (GO/ZnO nanorods/GO) nanocomposites prepared via a hydrothermal method on Si (100) substrate. The X-ray diffraction measurements (XRD) confirm that the prepared samples are of hexagonal wurtzite structure with crystallite size around 50–60 nm. It was obvious from scanning electron microscopy (SEM) that by incorporating the ZnO nanorods between the inter-layer of GO confirmed the formation of sandwich-like nanocomposites structure. ZnO nanorods interaction with GO is displayed by the different vibrational frequencies in fourier transform infrared spectroscopy (FTIR). The UV–Vis spectrum reveals the strongest absorption was observed around 370 nm, while calculating optical band gap energy (Eg) of GO/ZnO NRs/GO was found to be 3.15 eV. The photoluminescence (PL) measurements indicates that the ZnO nanorods have a strong visible emission centered at 559 nm attributed to the presence of impurities in the form of oxygen vacancies After the nanorods were covered with GO layers, the PL intensity of the nanocomposite is quenched and shifted due to charge-transfer process. Consequently, the obtained results may lead to better performance for the optoelectronic applications. |
| Databáze: | OpenAIRE |
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