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

作　　者：郭旭 姚勇 汪洋 蔡燕[1] 

机构地区：[1]南通大学化学化工学院,江苏 南通

出　　处：《分析化学进展》2024年第3期190-199,共10页Advances in Analytical Chemistry

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。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

关 键 词：金银纳米线 还原氧化石墨烯 石墨相氮化碳 生物小分子 光电化学传感器 

分 类 号：TB3[一般工业技术—材料科学与工程]