Amplified detection signal at a photoelectrochemical aptasensor with a poly(diphenylbutadiene)-BiOBr heterojunction and Au-modified CeO2 octahedrons

Recent Progress in Photoelectrochemical Sensing of Pesticides in Food and Environmental Samples: Photoactive Materials and Signaling Mechanisms

“…Horseradish peroxidase (HRP) can facilitate the oxidation of 4-chloro-1-naphthol (4-CN) by H 2 O 2 to generate benzo-4-chlorohexadienone (4-CD), an insoluble and insulating precipitate, on photoelectrode surfaces [124]. Based on this principle, some DNAzymes or nanozymes have been designed to simulate the activity of HRP for a BCP reaction [92,[125][126][127]. Zhou and coworkers developed a PEC aptasensor for acetamiprid detection.…”

“…Combining aptasensing and λ exonuclease-assisted recycling amplification, an HRP-mimicking hemin/G-quadruplex DNAzyme formed and biocatalytically oxidized 4-CN to generate 4-CD, inhibiting electron donor diffusion to the surface of the photoanode and reducing the photocurrent response [92]. A PEC aptasensor was constructed by using CeO 2 -Au nanozyme as a signal amplification platform to conduct a BCP reaction and quench the photocurrent signals [127] (Figure 5b). The recognition of target acetamiprid caused the release of CeO 2 -Au from the photoelectrode, thus weakening the quenching effect and recovering the photocurrent signal.…”

Recent developments in bismuth oxyhalide-based functional nanomaterials for biomedical applications

“…16 For instance, nanoflowers are more conducive to the separation, transfer, and effective utilization of charge carriers in chemical reactions than nanosheets and nanospheres. 17 BiOX nanomaterials have many morphologies, mostly including nanosheets, 17–21 nanospheres, 17,22–24 nanoflowers, 17,25–27 cuboid-like structures, 28 lantern-like structures, 29 tremella-like structures, 30 and nanotubes. 31 BiOX nanomaterials are mainly synthesized via solvothermal methods, 17,22,32–37 hydrothermal methods, 23,24,26,38–41 room-temperature hydrolysis and redox methods, 42 chemical vapor deposition methods, 18,19 calcination methods, 27,43 ionic liquid self-combustion methods, 44 etc .…”

“…32 In the electrochemical field, BiOBr nanoflowers with a heterojunction structure promote high visible light absorption and effective photogenerated charge separation, which are the basic characteristics of sensitive photoelectrochemical sensors. 25…”

Potential of nanobiosensor in sustainable agriculture: the state-of-art

“…(2019) AuNPs AuNPs-antibody based immunochromatographic strip test (ICST) Detection of aflatoxin B1 and fumonisins 2 μg⋅kg −1 ; 1000 μg⋅kg −1 respectively Di Nardo et al. (2017) 14 Photoelectrochemical AuNPs Aptamer-Poly (diphenylbutadiene)-BiOBr composite and AuNPs-linked CeO 2 octahedron based photoelectrochemical sensing Detection of acetamiprid 0.05 pM Zheng et al. (2022) 15 Surface enhanced Raman scattering AuNRs AuNRs-nanoporous cellulose paper-based ​sensing platform Detection of thiram, tricyclazole, and carbaryl 6, 60, and 600 ng ​cm −2 respectively Kwon et al.…”