Designing Nanosheet Heterostructures of CuO Grown on Bi₂MoO₆ as a Photoelectrochemical Biosensor for Detecting Alpha‐Fetoprotein

Abstract

Bi 2 MoO 6 (BM) was modified with various amounts of CuO. Photoelectrochemical (PEC) tests of the resulting CuO-doped BM materials showed improved PEC performance. The best PEC performance was obtained for BM containing 5 wt % of CuO. CuO/BM-5 % was then used as an active material for an Alphafetoprotein (AFP) PEC biosensor. A PEC biosensor-based CuO/ BM-5 % detected AFP linearly from 0.01-1200 ng • L À 1 with a detection limit of 0.005 ng • L À 1 . The photoelectron potential of the CuO/BM-5 % heterojunction reduced the electron/hole recombination, which explains the excellent PEC performance of this material.