Zhao Shanshan, Tong Jianhua, Li Yang, Sun Jizhou, Bian Chao, Xia Shanhong
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Micromachines (Basel). 2019 Mar 29;10(4):223. doi: 10.3390/mi10040223.
An ultramicro interdigital array electrode modified by palladium-gold was developed for nitrate detection in neutral water. The ultramicro interdigital array electrode was fabricated based on silicon substrate by Micro Electro-Mechanical System (MEMS) technique. The nanostructured palladium-gold (Pd-AuNPs) composite sensing film was electrodeposited on the surface of a working electrode by electrochemical method. The synergistic effect of Pd-AuNPs composite was investigated and its enhancement of the catalytic activity and stability was revealed. The Pd-AuNPs modified electrode showed good linearity (R² = 0.99) from 1 mg/L to 15 mg/L (as N) for nitrate determination in a neutral water environment (pH = 7.2), with a sensitivity of 4.7 μA·mg·L. The results showed that the developed Pd-AuNPs-modified ultramicro interdigital array electrode chip can achieve sensitive and environmentally-friendly detection for nitrate in neutral water.
开发了一种钯金修饰的超微叉指阵列电极用于中性水中硝酸盐的检测。该超微叉指阵列电极基于硅基片通过微机电系统（MEMS）技术制备。采用电化学方法在工作电极表面电沉积纳米结构的钯金（Pd-AuNPs）复合传感膜。研究了Pd-AuNPs复合材料的协同效应，揭示了其对催化活性和稳定性的增强作用。在中性水环境（pH = 7.2）中，Pd-AuNPs修饰电极对硝酸盐测定在1 mg/L至15 mg/L（以N计）范围内显示出良好的线性（R² = 0.99），灵敏度为4.7 μA·mg·L。结果表明，所开发的Pd-AuNPs修饰的超微叉指阵列电极芯片能够实现对中性水中硝酸盐的灵敏且环境友好的检测。
