A competitive photoelectrochemical sensor based on the in situ formation of BiOBr/Bi2S3 by Cs3Bi2Br9 for the detection of trenbolone

This work for the first time proposed a photoelectrochemical (PEC) sensor based on the in situ generation of BiOBr/Bi2S3 by Cs3Bi2Br9 to detect trenbolone (TB). To be specific, Cs3Bi2Br9/BiOBr/Bi2S3 heterojunction, the chosen photoelectric material, that could produce stable and large photocurrent was obtained through two steps in situ growth method on the basic of Cs3Bi2Br9 perovskite. CdS and Au nanoparticles with outstanding light absorption characteristics were selected as TB antigen (Ag) marker. Under the aid of Au/CdS, the association between TB concentration and output current will be revealed by the competitive combining of TB antibodies (Ab) with TB or Ag-Au/CdS. If the concentration of TB was lower, the more Ag-Au/CdS was connected to the Ab, and the higher photocurrent signal was obtained. Hence, the competitive PEC sensor could realize reliable detection of TB with a lower detection limit of 29.7 fg mL(-1).

Automated summary

This work introduces a photoelectrochemical (PEC) sensor based on the in situ generation of BiOBr/Bi2S3 by Cs3Bi2Br9 for detecting trenbolone (TB). The Cs3Bi2Br9/BiOBr/Bi2S3 heterojunction, a stable and large photocurrent producing material, is obtained through a two-step in situ growth method on the basis of Cs3Bi2Br9 perovskite. CdS and Au nanoparticles are used as TB antigen (Ag) markers, and their competitive combination with TB or Ag-Au/CdS reveals the association between TB concentration and output current. The competitive PEC sensor achieves reliable detection of TB with a low detection limit of 29.7 fg mL(-1).