高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (8): 20240183.doi: 10.7503/cjcu20240183

• 分析化学 • 上一篇    下一篇

基于p-n异质结CuO/TiO2复合物高效的载流子分离能力构建超灵敏AFP光电化学分析

郑德论(), 张锐龙   

  1. 汕头职业技术学院建设生态学院, 汕头 515041
  • 收稿日期:2024-04-12 出版日期:2024-08-10 发布日期:2024-05-17
  • 通讯作者: 郑德论 E-mail:dlzheng@stpt.edu.cn
  • 基金资助:
    广东省科技创新战略专项资金(pdjh2023b0989);广东省普通高校特色创新项目(自然科学)(2023KTSCX335)

Construction of an Ultrasensitive AFP Photoelectrochemical Analysis Based on the Efficient Carrier Separation Capability of p-n Heterojunction CuO/TiO2 Complexes

ZHENG Delun(), ZHANG Ruilong   

  1. College of Construction and Ecology,Shantou Polytechnic,Shantou 515041,China
  • Received:2024-04-12 Online:2024-08-10 Published:2024-05-17
  • Contact: ZHENG Delun E-mail:dlzheng@stpt.edu.cn
  • Supported by:
    Guangdong Special Fund for Scientific and Technological Innovation Strategy Project, China(pdjh2023b0989);the Characte-ristic Innovative Projects of Guangdong Ordinary Colleges and Universities, China(2023KTSCX335)

摘要:

将TiO2纳米粒子与Cu(pta) MOFs复合, 通过高温煅烧策略制得CuO/TiO2复合物. 在最优实验条件下, 基于复合物对可见光更强的吸收利用效率, CuO/TiO2修饰的ITO电极展现出显著的光电化学(PEC)响应信号, 其光电流值(59.4 µA)分别是单组分TiO2和CuO粒子的15.5和7.4倍. 线性扫描伏安法(LSV)测试结果证实 CuO/TiO2/ITO电极比CuO和TiO2材料具有更大的LSV响应强度. 这可归因于获得的薄片层状CuO粒子及其兼有的多孔隙特征促进了光的多重散射/反射效应, 同时CuO/TiO2复合材料具有的典型p-n异质结构(能级带隙匹配)大幅促进了光生电荷载流子(e-/h+)的分离与转移. 选用戊二醛(GA)作为交联手臂分子, 通过温和的醛胺反应将壳聚糖(CS)和anti-AFP抗体组装于CuO/TiO2/ITO电极表面, 再用牛血清蛋白(BSA)封闭活性位点, 构建出PEC传感平台(BSA/anti-AFP/GA-CS/CuO/TiO2/ITO), 实现了对不同浓度甲胎蛋白(AFP)的高灵敏检测(检出限达到2.63×10-4 ng/mL). 制备的传感电极同时展示出良好的稳定性和选择性.

关键词: 薄片层CuO粒子, CuO/TiO2复合物, p-n异质结, 光电化学传感器, AFP检测

Abstract:

The p-n type composite materials are considered valuable materials to improve their photoelectrochemical(PEC) performance. In this paper, TiO2 nanoparticles were composited with Cu(pta) MOFs, and the CuO/TiO2 complex materials were prepared by the high-temperature calcination strategy. Under the optimal experimental conditions, based on the stronger absorption and utilization efficiency of visible light by the complexes, the CuO/TiO2-modified ITO electrodes exhibited significant enhancement of the PEC response signal, with the photocurrent value(59.4 µA) 15.5 and 7.4 times higher than that of single-component TiO2, and CuO particles, respectively. Linear scanning voltammetry(LSV) result confirmed that the CuO/TiO2/ITO electrode had a greater LSV response intensity than the CuO and TiO2 materials. It was attributed to the obtained lamellar layered CuO particles with porous features promoting the multiple scattering/reflection effect of light, while the typical p-n heterostructure (energy level band gap matching) of CuO/TiO2 composites substantially facilitated the separation and transfer of photo-generated charge carriers(e-/h+). GA was chosen as the crosslinking arm molecule to assemble CS and anti-AFP on the surface of CuO/TiO2/ITO electrodes through a simple aldolamine reaction, and then the active sites were closed with BSA, for which to construct a PEC sensing platform(BSA/anti-AFP/GA-CS/CuO/TiO2/ITO) and had achieved the high sensitivity detection of different concentrations of α-fetoprotein AFP(the detection limit reached to 2.63×10-4 ng/mL). This prepared sensing electrode demonstrated both good stability and satisfactory selectivity.

Key words: Thin-layered CuO particles, CuO/TiO2 composite, p-n Heterojunction, Photoelectrochemical sensor, AFP detection

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