基于AuAg/rGO-C3N4复合材料的光电化学传感器超灵敏检测尿酸
Ultra-Sensitive Detection of Uric Acid by Photoelectrochemical Sensors Based on AuAg/rGO-C3N4 Composites
摘要: 目的：本研究基于Ag、Au贵金属纳米材料的局域表面等离子体共振效应(LSPR)以及优秀的导电能力，在合成好的Ag线表面镀上一层Au，成功合成AuAg线复合材料。用表面积大的还原氧化石墨烯–氮化碳(rGO-C3N4)复合材料负载AuAg线，形成AuAg/rGO-C3N4复合材料，并用于尿酸(Uric Acid, UA)的光电化学检测。在可见光照下，rGO-C3N4吸收光子，电子(e−)发生跃迁，从价带跃迁到导带并转移到外电路产生光电流，而空穴(h+)会转移到材料表面，h+氧化待测物溶液中的尿酸并产生e−转移到外电路，电子流动产生光电流。由于rGO纳米片不仅具有较强的吸附能力，还有较大的表面积，可以吸附更多的尿酸到材料表面进行氧化，以增强光电流。由于AuAg线有着较高的电导率以及LSPR效应，可以加速电化学反应速率，抑制高能载流子的重组，可以提高光电流强度，最终实现对尿酸的超灵敏检测。该光电传感器检测尿酸时的浓度范围为0.5~200 μmol∙L−1，检出限为0.17 μmol∙L−1，表明基于AuAg/rGO-C3N4复合材料的光电化学传感器对尿酸具有较好的检测效果。该光电化学传感器具有制作简单、操作便捷、检测范围大等优点，为今后这类生物小分子检测传感器的构建提供了思路。
Abstract: Purpose: In this study, based on the Localized Surface Plasmon Resonance (LSPR) effect of Au and Ag noble metal nanomaterials and the good electrical conductivity, a layer of Au was coated on the surface of the synthesized Ag wire, and the AuAg NWs composites were successfully synthesized. AuAg NWs were loaded with reduced graphene-carbon nitride (rGO-C3N4) composites with large surface area to form AuAg/rGO-C3N4 composites for photoelectrochemical detection of Uric Acid (UA). Under visible light, rGO-C3N4 absorbs photons, electrons (e−) transition from valence band to conduction band and transfer to the outer circuit to generate photocurrent, while holes (h+) transfer to the surface of the material, h+ oxidizes UA in the analyte solution and generates e− transferred to the outer circuit, and electron flow generates photocurrent. Due to the strong adsorption capacity and large surface area of rGO nanosheets, more UA can be adsorbed to the surface of the material for oxidation to enhance the photocurrent. Due to the high conductivity and LSPR effect of AuAg NWs, it can accelerate the electrochemical reaction rate, inhibit the recombination of high-energy carriers, improve the photocurrent intensity, and finally achieve ultra-sensitive detection of UA. The concentration range of UA detected by the photoelectric sensor was 0.5~200 μmol∙L−1, and the detection limit was 0.17 μmol∙L−1, indicating that the photoelectrochemical sensor based on AuAg/rGO-C3N4 composites had a good detection effect on uric acid. The photoelectrochemical sensor has the advantages of simple fabrication, convenient operation and large detection range, which provides a way for the construction of this kind of biological small molecule detection sensor in the future.
文章引用：郭旭, 姚勇, 汪洋, 蔡燕. 基于AuAg/rGO-C3N4复合材料的光电化学传感器超灵敏检测尿酸[J]. 分析化学进展, 2024, 14(3): 190-199. https://doi.org/10.12677/aac.2024.143023

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