Bismuth tungstate perovskite has been identified as a promising photoelectric material. Nevertheless, the wide band gap of bismuth tungstate leads to short-wavelength absorption of a single material with an attenuated photocurrent response, hindering its realization in biosensing applications. In this study, F, S co-doped Bi2WO6 was synthesized by heat treatment and combined with SnS2 and CdS to form a ternary heterojunction composite. The resulting composite material, marked as F, S-Bi2WO6@SnS2@CdS, has excellent photoelectric characteristics. F, S co-doping can increase the number of oxygen vacancies, effectively reducing the band gap, and the introduction of narrow band gap metal-sulfur compounds can form ternary heterojunctions with them, further red-shifting the optical absorption wavelength, while greatly improving the photocurrent response through good energy level matching. The excellent level matching between AgInS2 and F,S-Bi2WO6@SnS2@CdS results in photocurrent enhancement. The competition between AgInS2-Ab-TB and AgInS2-Ab for limited binding sites leads to changes in the photocurrent signal, which can sensibly detect TB. The prepared PEC biosensor has excellent photocurrent response in the range of 0.1 pg/mL - 100 ng/mL, and the detection limit is 28.9 fg/mL. This study broadens the application of bismuth tungstate chalcogenide in biosensing and provides new ideas for the modification of other optoelectronic materials.
Keywords: AgInS(2); F; Photoelectrochemical (PEC) biosensor; S-Bi(2)WO(6)@SnS(2)@CdS; Trenbolone.
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