Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (8): 20240183.doi: 10.7503/cjcu20240183

• Analytical Chemistry • Previous Articles     Next Articles

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)

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

CLC Number: 

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