4.7 Article

Rational design an oval heterostructure and tight linking interface of ZnS@CdS(3) for sensitively photoelectrochemical bioanalysis of PSA

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JOURNAL OF ALLOYS AND COMPOUNDS
卷 972, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.172797

关键词

Photoelectrochemical; Type II heterojunction; Oval ZnS@CdS(3); Contact combining interface; PSA detection

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Photoactive materials with heterostructures can enhance the photoelectrochemical (PEC) property and are successfully applied in biosensor preparations.
Photoactive material with heterostructures could be effectively employed to promote the photoelectrochemical (PEC) property. Herein, two species heterostructured ZnS@CdS(1-2) composites derived from ZIF-8-S MOFs via a sulfofication reaction in situ using Cd(NO3)(2), CdC1(2) cadmium reagents, and further gained the oval ZnS@CdS(3) after annealing the ZnS@CdS(2). Under irradiation, the PEC results showed that the photocurrent response of ZnS@CdS(3) signally enhanced compared to disordered heterostructures of ZnS@CdS(1), ZnS@CdS(2) and pure ZnS or CdS. It was ascribed to the staggered levels based on matching band-gap to form type II heterojunction of ZnS@CdS(3) could facilitate photo-induced electron/hole (e(-)/h(+)) separation and transfer. The obtained photoelectric material with a tight connecting interface also could reduce the carriers transport distance. Besides, the structured and well-distributed ZnS@CdS(3) was beneficial to improve synergistic effect on every component, which resulting in violently photocurrent output. This ZnS@CdS(3) modified ITO electrode to create the PEC biosensor (BSA/anti-PSA/ZnS@CdS(3)/ITO) had been successfully applied for the PSA detection with a wide linear range of 0.001 similar to 150 ng mL(-1) and ultralow detection limit of 0.27 pg mL(-1). This research innovatively designed a close contact heterojunction interface with superior PEC nature for biosensor preparations.

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