Au/CeO2/g-C3N4 heterostructures: Designing a self-powered aptasensor for ultrasensitive detection of Microcystin-LR by density functional theory

Research progress on photoelectrochemical sensors for contamination analysis in agricultural fields

“…In addition, the properties of the PEC sensors for MC-LR detection are presented in Table 4. 11,40,[165][166][167][168][169][170][171][172][173][174] As early as 2017, Liu et al developed a PEC aptasensor for MC-LR detection by using Z-scheme CdTe-Bi2S3 heterojunction as the photoelectrode materials. 165 When the MC-LR is captured by the aptamer on the surface of the photoelectrode, the photocurrent of the sensor decreases within the linear range of 1  10 -14 to 1  10 -10 mol/L, with a detection limit of 5  10 -15 mol/L (Fig.…”

“…165 Ouyang et al used Au/CeO2/g-C3N4 heterostructures to design a self-powered aptasensor for MC-LR detection. 11 Once the MC-LR is captured by the aptamer and immobilized on the Au NPs, it is directly oxidized by the photo-generated holes and ⋅OH because the oxidation potential of MC-LR (0.2 V) is lower than the VB energy (1.59 V) of g-CN. The as-obtained PEC aptasensor has been demonstrated…”

“…In addition to mycotoxins, microcystin-leucine arginine is another considerable toxin that causes many accidents and threatens human health. 11 Thus, sensitive and reliable analytical methods are required to monitor heavy metals, antibiotics, pesticides, and toxins in agricultural fields.…”

Novel Anti-Interference Strategy for a Self-Powered Sensor: Mediator-Free and Biospecific Photocathode Interface

“…3−5 The self-powered sensors based on the photocatalytic fuel cell (PFC) could work without any external energy to achieve the self-powered monitoring of the target. 6 Until now, most of the designed self-powered sensors relied on a single-photoelectrode system, which used a photosensitive semiconductor as a photoanode or photocathode, while the other electrode used the precious metal Pt and inevitably used some mediators and a proton membrane. 7,8 Generally, the photoanode self-powered sensor based on n-type semiconductors with electrons as the major charge carriers has high response ability and detection sensitivity.…”

“…As a new electrochemical sensing concept, the self-powered sensor has inherited the advantages of the traditional electrochemical analysis technology, such as high sensitivity, fast response, simple equipment, and low cost. , In recent years, it has shown a good application prospect in the fields of life analysis, environmental monitoring, and food safety detection. − The self-powered sensors based on the photocatalytic fuel cell (PFC) could work without any external energy to achieve the self-powered monitoring of the target . Until now, most of the designed self-powered sensors relied on a single-photoelectrode system, which used a photosensitive semiconductor as a photoanode or photocathode, while the other electrode used the precious metal Pt and inevitably used some mediators and a proton membrane. , Generally, the photoanode self-powered sensor based on n-type semiconductors with electrons as the major charge carriers has high response ability and detection sensitivity.…”