Liu Chao, Chen Daoming, Zhu Chunnan, Liu Xiaojun, Wang Yu, Lu Yuepeng, Zheng Dongyun, Fu Baorong
College of Biomedical Engineering, South-Central Minzu University, Wuhan 430074, China.
Hubei Key Laboratory of Medical Information Analysis & Tumor Diagnosis and Treatment, Wuhan 430074, China.
Micromachines (Basel). 2023 Mar 20;14(3):687. doi: 10.3390/mi14030687.
Silver nanoparticles (AgNPs) were synthesized through an environmentally friendly method with tea extract as a reduction agent. By immobilizing them on the surface of a low-cost pencil graphite electrode (PGE) with the aid of a simple and well-controlled in-situ electropolymerization method, a novel nanosensing interface for nitrite was constructed. The film-modified PGE showed good electrocatalytic effects on the oxidation of nitrite and was characterized through scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical techniques. Characterization results clearly show that the successful modification of AgNPs improved the surface area and conductivity of PGEs, which is beneficial to the high sensitivity and short response time of the nitrite sensor. Under the optimal detection conditions, the oxidation peak current of nitrite had a good linear relationship with its concentration in the range of 0.02-1160 μmol/L with a detection limit of 4 nmol/L and a response time of 2 s. Moreover, the sensor had high sensitivity, a wide linear range, a good anti-interference capability, and stability and reproducibility. Additionally, it can be used for the determination of nitrite in food.
通过一种以茶提取物为还原剂的环保方法合成了银纳米颗粒（AgNPs）。借助简单且可控的原位电聚合方法将其固定在低成本铅笔石墨电极（PGE）表面，构建了一种用于亚硝酸盐检测的新型纳米传感界面。膜修饰的PGE对亚硝酸盐氧化表现出良好的电催化作用，并通过扫描电子显微镜、X射线光电子能谱和电化学技术进行了表征。表征结果清楚地表明，AgNPs的成功修饰提高了PGE的表面积和导电性，这有利于亚硝酸盐传感器的高灵敏度和短响应时间。在最佳检测条件下，亚硝酸盐的氧化峰电流与其浓度在0.02 - 1160 μmol/L范围内具有良好的线性关系，检测限为4 nmol/L，响应时间为2 s。此外，该传感器具有高灵敏度、宽线性范围、良好的抗干扰能力以及稳定性和重现性。此外，它可用于食品中亚硝酸盐的测定。
