From engineered photoactive materials to detection signal amplification strategies in photoelectrochemical biosensing of pathogens: New horizons and perspectives

Recent Advances in Photoelectrochemical Sensing for Food Safety

“…Since the initial signal generated by the PEC reaction is extremely weak and the concentration of the target is very low in practical applications, the resulting photocurrent is of insufficient signal strength to accurately measure and distinguish background noise. Therefore, signal amplification strategies are needed to greatly increase the sensitivity of the sensor, thereby reducing the detection limit and enabling the detection of low-concentration samples. − Currently, the sensing process can be realized by signal amplification using enzyme-catalyzed reaction, , nucleic acid cycle amplification , and redox cascade reaction. , …”

Photoelectrochemical analysis of Pb2+ based on Au@PTCA Schottky junction with Pb2+-G quadruplex structure

“…19 Specifically, the Schottky junction is an interface between a metal and a semiconductor, and its construction process is particularly simple and convenient without the consideration of energy level matching or photoactive material screening. 20 More importantly, owing to its noticeable unidirectional conductive characteristic, the Schottky junction can effectively suppress the recombination of electron–hole pairs and promote the separation of carriers, which can readily achieve enhanced photoelectric conversion efficiency in the PEC sensing system. 21 Inspired by these merits, the renowned Schottky junction is used in this work to boost the photoelectric performance for achieving sensitive PEC analysis of Pb 2+ .…”