Water-stable CsPbBr${}_3$/reduced graphene oxide nanoscrolls for high-performance photoelectrochemical sensing

Perovskite quantum dots (PQDs) have attracted much attention in the field of photoelectrochemical (PEC) sensors owing to their superb optical properties and efficient charge transport, but the inherent poor stability severely hinders their PEC applications. Herein, hydrolysis-resistant CsPbBr${}_3$/reduced graphene oxide nanoscrolls (CsPbBr${}_3$/rGO NSs) are obtained by solvent-assisted self-rolling process toward water-stable PEC sensors. CsPbBr${}_3$ QDs embedded in rGO nanosheets can be prevented from water since the multilayer rGO shell layers, which maintains excellent optical properties. On account of strong interfacial interactions, rGO nanosheets are crimped spontaneously with CsPbBr${}_3$ QDs, which offer access to superb structural and long-term storage stability. Moreover, appropriate band alignment and ultrafast interfacial carrier transfer enable CsPbBr${}_3$/rGO NSs to exhibit greatly enhanced anode photocurrent response for subsequent PEC sensing. As a demonstration, the molecular imprinted PEC sensors for two kinds of mycotoxins (aflatoxin B1 or ochratoxin A) presents an ultra-high sensitivity and good anti-interference ability. Significantly, this work provides an inspirable and convenient route for hydrolysis-resistant PQDs-based optoelectronic and photoelectrocatalytic applications in aqueous ambience. (© 2023 Wiley‐VCH GmbH)