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Green synthesis, photocatalytic and photoelectrochemical performance of an Au-Graphene nanocomposite

机译：金-石墨烯纳米复合材料的绿色合成，光催化和光电化学性能

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摘要

A simplistic and environmentally friendly approach using electrochemically active biofilms (EABs) was developed for the synthesis of an Au-Graphene (Au-G) nanocomposite without the use of surfactants or capping agents. The as-prepared Au-G nanocomposite was characterized by X-ray diffraction, diffuse reflectance spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, and transmission electron microscopy. In this study, the anchoring of gold nanoparticles (AuNPs) on graphene sheets was achieved using an EAB. The EAB assists in the bio-reduction of Au3+ to Au-0, and the AuNPs prevent the aggregation of graphene sheets and keep them apart because of the decrease in attractive forces between the graphene layers. The photocatalytic activities of the Au-G nanocomposite were evaluated by the photocatalytic degradation of methylene blue in an aqueous solution at ambient temperature in the dark and under visible-light irradiation. The photocatalytic activity of the Au-G nanocomposite was enhanced significantly by the loading of AuNPs onto graphene sheets. The photocurrent of the Au-G nanocomposite was measured by linear sweep voltammetry, which exhibited much better performance than pure graphene. The high photocatalytic activity and photocurrent of the Au-G nanocomposite was attributed mainly to the anchoring of AuNPs on the graphene sheets. The synergistic effects of the surface plasmonic resonance of AuNPs and the specific electronics effect of graphene holds great promise for the development of electrochemical devices. Therefore, the Au-G nanocomposite has potential in several fields, such as photocatalysis, photovoltaic, nanoelectronics, ultracapacitors, and sensors because of the enhanced photocatalytic and photoelectrochemical performance.
机译：开发了一种使用电化学活性生物膜（EAB）的简单环保方法，无需使用表面活性剂或封端剂即可合成金-石墨烯（Au-G）纳米复合材料。所制备的Au-G纳米复合材料通过X射线衍射，漫反射光谱，拉曼光谱，X射线光电子光谱，光致发光光谱和透射电子显微镜表征。在这项研究中，使用EAB实现了金纳米颗粒（AuNPs）在石墨烯片上的锚固。 EAB有助于将Au3 +生物还原为Au-0，而AuNPs可以防止石墨烯片的聚集，并由于石墨烯层之间的吸引力降低而使其分开。通过在环境温度下在黑暗中和在可见光照射下，亚甲基蓝在水溶液中的光催化降解来评估Au-G纳米复合材料的光催化活性。 Au-G纳米复合材料的光催化活性通过将AuNPs负载到石墨烯片上而显着增强。通过线性扫描伏安法测量Au-G纳米复合材料的光电流，其表现出比纯石墨烯更好的性能。 Au-G纳米复合材料的高光催化活性和光电流主要归因于AuNPs在石墨烯片材上的锚固。 AuNPs的表面等离子体共振和石墨烯的特定电子效应的协同效应对于电化学装置的发展具有广阔的前景。因此，由于增强的光催化和光电化学性能，Au-G纳米复合材料在光催化，光伏，纳米电子，超级电容器和传感器等多个领域具有潜力。

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