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Reduced graphene oxide anchored with zinc oxide nanoparticles with enhanced photocatalytic activity and gas sensing properties

机译:还原的氧化石墨烯与氧化锌纳米颗粒锚定,具有增强的光催化活性和气敏特性

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Reduced graphene oxide (rGO)-zinc oxide (ZnO) composites were synthesized by a two-step hydrolysis-calcination method, using GO and Zn(Ac)(2) as precursors. The structure and morphology of the as-prepared samples were characterized by thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and field emission scanning electron microscopy. It was shown that the well-dispersed ZnO nanoparticles (NPs) were deposited on rGO homogeneously. So far as ZnO NPs with different diameters were synthesized in the varied samples, the ZnO NPs with an average diameter of around 10 nm which were obtained at the heating temperature of 300 degrees C for 4 h exhibited higher photocatalytic activity than the others. A relatively low amount of rGO-ZnO composites (5 mg) demonstrated enhanced photocatalytic activity to decompose methyl orange (MO, 40 mg L-1) and methylene blue (MB, 10 mg L-1) under low-power ultraviolet light. Furthermore, rGO-ZnO composites exhibited high sensitivity, and a response can be achieved at 50.09 to 1000 ppm acetone. In addition, the ultraviolet light-induced photocatalytic mechanism as well as gas sensing mechanism was also discussed. Both rGO and crystallinity played important roles in improving photocatalytic activity and gas sensing properties.
机译:以GO和Zn(Ac)(2)为前驱体,通过两步水解-煅烧方法合成了还原氧化石墨烯(rGO)-氧化锌(ZnO)复合材料。通过热重分析,X射线衍射,傅立叶变换红外光谱,透射电子显微镜和场发射扫描电子显微镜表征所制备样品的结构和形态。结果表明,分散良好的ZnO纳米颗粒(NPs)均匀沉积在rGO上。就在不同样品中合成不同直径的ZnO NPs而言,在300℃的加热温度下4 h获得的平均直径约为10 nm的ZnO NPs具有更高的光催化活性。相对少量的rGO-ZnO复合材料(5 mg)在低功率紫外光下显示出增强的光催化活性,可分解甲基橙(MO,40 mg L-1)和亚甲基蓝(MB,10 mg L-1)。此外,rGO-ZnO复合材料表现出高灵敏度,并且可以在50.09至1000 ppm丙酮下获得响应。此外,还讨论了紫外线诱导的光催化机理以及气体传感机理。 rGO和结晶度在改善光催化活性和气体传感特性方面都起着重要作用。

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