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Electrochemical properties of silver nanoparticle-supported reduced graphene oxide in nitric oxide oxidation and detection

机译：纳米银负载的氧化石墨烯在一氧化氮中的电化学性质及检测

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This article reports the effect of ascorbic acid in the formation of a reduced graphene oxide-silver (rGO-Ag) nanocomposite and its influence on the electrochemical oxidation of nitric oxide (NO). The formation of the rGO-Ag nanocomposite was confirmed using UV-visible absorption spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) analyses. Crystalline and spherical Ag nanoparticles (NPs) with an average particle size of 2 nm were found in the rGO-Ag nanocomposite with the assistance of 5.0 M ascorbic acid. The electrochemical properties of the rGO-Ag nanocomposite-modified glassy carbon (GC) electrode were investigated for the oxidation of NO. The rGO-Ag (5.0 M) nanocomposite-modified electrode displayed a higher catalytic current response compared to other controlled modified electrodes in cyclic voltammetry toward the oxidation of NO in 0.1 M phosphate buffer (pH 2.5). The electroanalytical application of the nanocomposite was performed using an amperometry technique, and the limit of detection (LOD) was found to be 2.84 mu M for the in situ detection of NO. The present nanocomposite was stable, sensitive, and selective in the presence of the common physiological interferents such as ascorbic acid, uric acid, dopamine, glucose, urea, and NaCl.
机译：本文报道了抗坏血酸在还原型氧化石墨烯-银（rGO-Ag）纳米复合材料的形成中的作用及其对一氧化氮（NO）电化学氧化的影响。使用紫外可见吸收光谱，X射线衍射（XRD），拉曼光谱，X射线光电子能谱（XPS）和透射电子显微镜（TEM）分析确认了rGO-Ag纳米复合材料的形成。在5.0 M抗坏血酸的帮助下，在rGO-Ag纳米复合材料中发现了平均粒径为2 nm的晶体和球形Ag纳米颗粒（NPs）。研究了rGO-Ag纳米复合修饰玻碳电极对NO氧化的电化学性能。与循环伏安法中的其他受控修饰电极相比，rGO-Ag（5.0 M）纳米复合修饰电极对0.1 M磷酸盐缓冲液（pH 2.5）中NO的氧化显示出更高的催化电流响应。使用电流分析技术对纳米复合材料进行电分析应用，发现原位检测NO的检出限（LOD）为2.84μM。在常见的生理干扰物如抗坏血酸，尿酸，多巴胺，葡萄糖，尿素和NaCl的存在下，本发明的纳米复合材料是稳定，敏感和选择性的。

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