1. Highly sensitive PEC immunosensor for CA15–3 detection based on Bi2S3-sensitized hexagonal ZnTiO3 and Au-functionalized ZnS.
- Author
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Shi, Yongxin, Hao, Yong, Dong, Yujia, Wang, Huan, Fan, Dawei, Ma, Hongmin, and Wei, Qin
- Subjects
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CHARGE exchange , *DETECTION limit , *VISIBLE spectra , *EARLY detection of cancer , *IMMUNOASSAY - Abstract
The biomarker CA15–3 plays a significant role in cancer diagnosis and therapeutic monitoring. In this study, a photoelectrochemical (PEC) immunosensor was designed using hexagonal ZnTiO 3 /Bi 2 S 3 heterojunction as the photoactive material, and ZnS@Au as a label for the detection antibody to amplify the signal. The hexagonal ZnTiO 3 serves as the substrate material, providing a stable photocurrent response, while Bi 2 S 3 forms a band-matching heterostructure with ZnTiO 3 , facilitating the transfer of photogenerated electrons. Additionally, the narrow bandgap of Bi 2 S 3 sensitizes the material, broadening its visible light response and further enhancing the photocurrent output. Moreover, square-shaped ZnS functionalized with Au NPs is employed as a quenching signal label, which effectively competed the photogenerated electrons and consumed electron donors in the electrolyte, thereby increasing the detection sensitivity. This sensor offers a broad detection range for CA15–3, from 0.001 U·mL−1 to 1000 U·mL−1, with a detection limit of 0.0003 U·mL−1, illustrating its potential for precise and reliable cancer biomarker detection. • Simple and stable synthesis of hexagonal ZnTiO 3 with application to photoelectrochemical immunoassay. • Bi 2 S 3 sensitizes hexagonal ZnTiO 3 while bandgap matching. • A special morphology of ZnS was used as a marker. • The sensor has high sensitivity and selectivity with a detection limit of 0.0003 U·mL−1. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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