Division of Physics and Semiconductor Science, Dongguk University, Seoul 04620, Korea.
Sensors (Basel). 2022 Feb 2;22(3):1151. doi: 10.3390/s22031151.
A very simple, as well as sensitive and selective, sensing protocol was developed on a pre-anodized graphite pencil electrode surface coated using poly(thionine) (APGE/PTH). The poly(thionine) coated graphite pencil was then used for simultaneous sensing of 3-nitrophenol (3-NP) and 4-nitrophenol (4-NP). The poly(thionine) coated electrode exhibited an enhanced electrocatalytic property towards nitrophenol (3-NP and 4-NP) reduction. Redox peak potential and current of both nitrophenols were found well resolved and their simultaneous analysis was studied. Under optimized experimental conditions, APGE/PTH showed a long linear concentration range from 20 to 230 nM and 15 nM to 280 nM with a calculated limit of detection (LOD) of 4.5 and 4 nM and a sensitivity of 22.45 µA/nM and 27.12 µA/nM for 3-NP and 4-NP, respectively. Real sample analysis using the prepared sensor was tested with different environmental water samples and the sensors exhibited excellent recovery results in the range from 98.16 to 103.43%. Finally, the sensor exposed an promising selectivity, stability, and reproducibility towards sensing of 3-NP and 4-NP.
在经过预阳极氧化处理的石墨电极表面涂覆聚噻吩（APGE/PTH），开发了一种非常简单、灵敏且选择性高的传感协议。然后，使用涂覆有聚噻吩的石墨电极同时感测 3-硝基苯酚（3-NP）和 4-硝基苯酚（4-NP）。涂覆有聚噻吩的电极对硝基苯酚（3-NP 和 4-NP）还原表现出增强的电催化性能。发现两种硝基酚的氧化还原峰电位和电流都得到了很好的分辨，并研究了它们的同时分析。在优化的实验条件下，APGE/PTH 对 3-NP 和 4-NP 的线性浓度范围分别为 20 至 230 nM 和 15 nM 至 280 nM，计算出的检测限（LOD）分别为 4.5 和 4 nM，灵敏度分别为 22.45 µA/nM 和 27.12 µA/nM。使用制备的传感器对不同环境水样进行了实际样品分析，传感器在 98.16%至 103.43%的范围内表现出出色的回收率。最后，该传感器对 3-NP 和 4-NP 的传感表现出了良好的选择性、稳定性和重现性。
