Fabrication of zinc oxide graphene oxide nanocomposite for ultraviolet photoconductive sensor and photocatalytic application
<p>The aim of this study was to fabricate zinc oxide (ZnO) and aluminium (Al) doped</p><p>ZnO nanorods (NRs) nanowires (NWs) graphene oxide (GO) and reduced GO (rGO) for ultraviolet (UV)</p><p>photoconductive sensor and photocatal...
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| Format: | thesis |
| Language: | eng |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=9162 |
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| Summary: | <p>The aim of this study was to fabricate zinc oxide (ZnO) and aluminium (Al) doped</p><p>ZnO nanorods (NRs) nanowires (NWs) graphene oxide (GO) and reduced GO (rGO) for ultraviolet (UV)</p><p>photoconductive sensor and photocatalytic applications. The method used to synthesize GO was</p><p>electrochemical exfoliation assisted by custom- made triple-tails sodium 1, 4-bis</p><p>(neopentyloxy)-3-(neopentyloxycarbonyl)-1, 4- dioxobutane-2-silphonate (TC14) and commercially</p><p>available single-tail sodium dodecyl sulphate (SDS) surfactants. Then, to produce rGO the</p><p>exfoliated GO was reduced via reduction process by adding hydrazine hydrate. The ZnO and AlZnO NRs</p><p>and NWs were synthesized via sol-gel immersion method. The hybridized ZnO and AlZnO NRs and NWs</p><p>samples with SDS-GO, SDS-rGO, TC14-GO and TC14-rGO were done by spray coating method. The</p><p>ZnO/GO-based samples were characterized using scanning electron microscopy, energy dispersive</p><p>X-ray, high resolution transmission electron microscopy, X-ray diffraction, micro-Raman, UV-visible</p><p>(UV- Vis) spectroscopy and four-point probes measurement. The UV photocurrent measurement</p><p>system and UV-Vis spectroscopy were then used to analyse the UV photoconductive sensor and</p><p>photocatalytic performances respectively. The finding show that the highest sensitivity and</p><p>responsivity of UV photoconductive sensor at around 47.3 and 345.7 mA/W were observed in AlZnO</p><p>NWs/TC14-GO (24 hours) sample. Meanwhile 90 g of sand/ZnO NRs/TC14-GO with reaction time of 48</p><p>hours exhibited the highest photocatalytic efficiency of 100% removal of 5ppm of methylene blue</p><p>(MB). The improvement of both UV photoconductive sensor and photocatalytic performances were</p><p>believed due to the existence of GO that help to lower the recombination rate of electrons-holes by</p><p>trapping the electron within the GO sheets. In conclusion, the AlZnO NWs/TC14-GO (24 hours)</p><p>nanocomposites demonstrate a good material for UV photoconductive sensor application. The sand/ZnO</p><p>NRs/TC14-GO is a great potential material for photocatalytic application. The implication of this</p><p>study is a novel, green and economical approach for UV photoconductive sensor and photocatalytic</p><p>application by using AlZnO NWs/TC14-</p><p>GO (24 hours) and sand/ZnO NRs/TC14-GO, respectively.</p><p></p> |
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