A facile photoelectrochemical sensor for high sensitive ROS and AA detection based on graphitic carbon nitride nanosheets

Publication date: 1 June 2018
Source:Biosensors and Bioelectronics, Volume 107
Author(s): Robabeh Motaghed Mazhabi, Liqin Ge, Hui Jiang, Xuemei Wang
Photoactive material is one of the main challenges for fabrication of sensitive and selective photoelectrochemical (PEC) sensor. Herein, a facile PEC sensor is constructed using graphitic carbon nitride nanosheets (g-C3N4 NSs) coated on the surface of ITO electrode, where electron donor properties of potassium ferrocyanide and ascorbic acid is utilized for the tracing of hydrogen peroxide (H2O2), hypochlorite (ClO^-), and ascorbic acid (AA). Our designed PEC sensor exhibits a good linear range to H2O2 concentrations from 12.5 to 875 µM in pH = 7.4 and 2.5–400 µM in pH = 10, while that for AA is in the range from 0.25 to 100 µM in pH = 7.4, and with the same pH for ClO^- concentrations in the range from 0.5 to 19 × 10⁻³% (V/V) in a bleach sample. Owing to the good responses towards the traces of H2O2, AA, and ClO^-, our designed system may be used as H2O2, ClO^-, and AA sensor for outdoor applications with high specificity, long-time stability and good reproducibility.



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