基于石墨相氮化碳纳米片的高灵敏 ROS 和 AA 检测光电化学传感器的简便制备
A facile photoelectrochemical sensor for high sensitive ROS and AA detection based on graphitic carbon nitride nanosheets.
机构信息
State Key Laboratory of Bioelectronics (Chien-Shiung Wu Laboratory), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
State Key Laboratory of Bioelectronics (Chien-Shiung Wu Laboratory), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
出版信息
Biosens Bioelectron. 2018 Jun 1;107:54-61. doi: 10.1016/j.bios.2018.02.008. Epub 2018 Feb 5.
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-CN 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 (HO), hypochlorite (ClO), and ascorbic acid (AA). Our designed PEC sensor exhibits a good linear range to HO 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% (V/V) in a bleach sample. Owing to the good responses towards the traces of HO, AA, and ClO, our designed system may be used as HO ClO, and AA sensor for outdoor applications with high specificity, long-time stability and good reproducibility.
光活性材料是制备敏感和选择性光电化学（PEC）传感器的主要挑战之一。本文构建了一种简便的 PEC 传感器，在 ITO 电极表面涂覆了石墨相氮化碳纳米片（g-CN NSs），利用铁氰化钾和抗坏血酸的电子给体性质来追踪过氧化氢（HO）、次氯酸盐（ClO）和抗坏血酸（AA）。我们设计的 PEC 传感器在 pH = 7.4 时，HO 浓度在 12.5 至 875 µM 范围内呈现出良好的线性范围，在 pH = 10 时，HO 浓度在 2.5 至 400 µM 范围内呈现出良好的线性范围，而在 pH = 7.4 时，AA 的线性范围为 0.25 至 100 µM。对于 ClO，在漂白样品中，同一 pH 值下，ClO 浓度在 0.5 至 19×10%（V/V）范围内呈现出良好的线性范围。由于对 HO、AA 和 ClO 的痕量具有良好的响应，我们设计的系统可用于户外应用的 HO、ClO 和 AA 传感器，具有高特异性、长时间稳定性和良好的重现性。
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