A molecularly imprinting photoelectrochemical sensor based on Bi₂O₂S-sensitized perovskite Cs₂AgBiBr₆ for sarcosine...

An original molecular imprinting photoelectrochemical (PEC) sensor for sarcosine detection based on stable lead-free inorganic halide double perovskite Cs₂AgBiBr₆ is proposed. Cs₂AgBiBr₆ as a lead-free halide perovskite material possesses several positive optoelectronic properties for PEC analysis, such as long-lived component to the charge-carrier lifetime, and strong absorption of visible light. At the same time, two-dimensional materials also offer excellent electronic and mechanical properties; thus, Bi₂O₂S was used and combined with Cs₂AgBiBr₆ to provide a stable and large photocurrent, which also benefits from the  stability of perovskite Cs₂AgBiBr₆. Based on this novel PEC assay, the detection range for sarcosine was between 0.005 and 5000 ng/mL with a low detection limit of 0.002 ng/mL. This work also improved the adhibition of metal halide perovskite in analytical chemistry field, providing a novel way for other small molecule detection.