A mesoporous silver-doped TiO2-SnO2 nanocomposite on g-C3N4 nanosheets and decorated with a hierarchical core−shell metal-organic framework for simultaneous voltammetric determination of ascorbic acid, dopamine and uric acid,Microchimica Acta

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A mesoporous silver-doped TiO2-SnO2 nanocomposite on g-C3N4 nanosheets and decorated with a hierarchical core−shell metal-organic framework for simultaneous voltammetric determination of ascorbic acid, dopamine and uric acid
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-01-01 , DOI: 10.1007/s00604-019-4045-x
Srinivasan Krishnan ₁ , Liangyu Tong ₁ , Shanhu Liu ₁ , Ruimin Xing ₁

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AbstractAn electrochemical sensor is described for the simultaneous voltammetric determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). An indium-tin oxide (ITO) electrode was modified with a hierarchical core−shell metal-organic framework and Ag-doped mesoporous metal-oxide based hybrid nanocomposites on g-C3N4 nanosheets. The morphology, structural and chemical composition of the hybrid nanocomposite was characterized using different analytical methods. The modified ITO showed superior electrocatalytic performance towards the oxidation of AA, DA and UA due to the enhanced surface area, synergistic effects and well-organized porous assembly. Figures of merit, include (a) linear responses from 0.1 to 200 μM, 2.5 to 100 μM and 2.5 to 625 μM; (b) detection limits (at S/N = 3) of 0.02, 0.01 and 0.06 μM, and (c) well separated oxidation peaks near −50, 186 and 390 mV (vs. Ag/AgCl) for simultaneous sensing AA, DA and UA, respectively. The sensor was evaluated by analysing spiked serum samples and gave data with precision, with recoveries of >98%. Graphical abstractSchematic Representation of a Mesoporous Silver-doped TiO2-SnO2 Nanocomposite (h-ATS) on g-C3N4 Nanosheets and Decorated with a Hierarchical Core−Shell Metal-Organic Framework (NC@GC) Based Electrochemical Sensor for Simultaneous Voltammetric Detection of Ascorbic acid, Dopamine and Uric acid

中文翻译：

g-C3N4 纳米片上的介孔银掺杂 TiO2-SnO2 纳米复合材料并装饰有分级核壳金属有机框架，用于同时伏安法测定抗坏血酸、多巴胺和尿酸

摘要描述了一种用于同时伏安法测定抗坏血酸 (AA)、多巴胺 (DA) 和尿酸 (UA) 的电化学传感器。在 g-C3N4 纳米片上用分级核壳金属有机框架和 Ag 掺杂的介孔金属氧化物基混合纳米复合材料对氧化铟锡 (ITO) 电极进行了修饰。使用不同的分析方法表征了混合纳米复合材料的形态、结构和化学成分。由于增加的表面积、协同效应和组织良好的多孔组装，改性的 ITO 对 AA、DA 和 UA 的氧化表现出优异的电催化性能。品质因数包括 (a) 0.1 至 200 μM、2.5 至 100 μM 和 2.5 至 625 μM 的线性响应；(b) 检测限（S/N = 3）为 0.02、0.01 和 0.06 μM，(c) 分别在-50、186 和 390 mV（相对于 Ag/AgCl）附近分离良好的氧化峰，用于同时感测 AA、DA 和 UA。该传感器通过分析加标血清样品进行评估，并提供精确的数据，回收率 > 98%。图形摘要示意图表示 g-C3N4 纳米片上的介孔银掺杂 TiO2-SnO2 纳米复合材料 (h-ATS) 并装饰有基于分层核壳金属有机框架 (NC@GC) 的电化学传感器，用于同时伏安检测抗坏血酸, 多巴胺和尿酸

更新日期：2020-01-01

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