In this work the possibility was investigated to synthesize in-situ silver nanoparticles (AgNP) on graphene oxide (GO) surface without commonly used additional reducing or alkalizing agents or increased temperature. Using diverse microscopic (AFM, TEM) and spectroscopic methods, it was proved that very small AgNPs were formed on GO by simple incubation for 2 hours a mixture of GO dispersion and AgNO3. The prepared nanomaterial (GO_Ag) was also assessed using electrochemical methods and it exhibited electrochemical behavior similar to GO_Ag nanomaterial prepared with a help of citric acid as a reducing agent. Furthermore, it was found that i) electrochemical reduction of the GO_Ag on electrode surface decreased the voltammetric response even though this step has increased the surface conductivity and ii) GO_Ag can be employed for sensing of chlorides with detection limit of 79 M and a linear range up to 10 mM. It could also provide electrochemical response toward chloroacetanilide herbicide metazachlor. Hence, the reducing capabilities of GO were proved to be applicable for in-situ synthesis of metal nanoparticles with the highest possible simplification and the as-prepared nanomaterials could be employed for fabrication of different electrochemical sensors.

中文翻译：

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氧化石墨烯上银纳米粒子的简化合成及其在电催化中的应用

在这项工作中，研究了在氧化石墨烯 (GO) 表面上原位合成银纳米粒子 (AgNP) 的可能性，而无需常用的额外还原剂或碱化剂或升高的温度。使用不同的显微镜（AFM、TEM）和光谱方法，证明了通过简单的孵育 2 小时（GO 分散体和 AgNO3 的混合物）在 GO 上形成了非常小的 AgNP。还使用电化学方法对制备的纳米材料 (GO_Ag) 进行了评估，它表现出类似于在柠檬酸作为还原剂的帮助下制备的 GO_Ag 纳米材料的电化学行为。此外，发现 i) GO_Ag 在电极表面的电化学还原降低了伏安响应，尽管该步骤增加了表面电导率；ii) GO_Ag 可用于检测氯化物，检测限为 79 M，线性范围可达至 10 毫米。它还可以提供对氯乙酰苯胺除草剂吡草胺的电化学响应。因此，GO的还原能力被证明适用于原位合成金属纳米粒子，并且尽可能简化，并且所制备的纳米材料可用于制造不同的电化学传感器。