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Micromachines
Volume 10
Issue 4
10.3390/mi10040223
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Article

Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water

by
Shanshan Zhao
1,2,
Jianhua Tong
1,
Yang Li
1,
Jizhou Sun
1,
Chao Bian
1,* and
Shanhong Xia
1
1
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(4), 223; https://doi.org/10.3390/mi10040223
Submission received: 26 February 2019 / Revised: 25 March 2019 / Accepted: 26 March 2019 / Published: 29 March 2019
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Abstract

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−1·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.
Keywords: nitrate; ultramicro electrode; Pd-AuNPs; neutral water nitrate; ultramicro electrode; Pd-AuNPs; neutral water

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MDPI and ACS Style

Zhao, S.; Tong, J.; Li, Y.; Sun, J.; Bian, C.; Xia, S. Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water. Micromachines 2019, 10, 223. https://doi.org/10.3390/mi10040223

AMA Style

Zhao S, Tong J, Li Y, Sun J, Bian C, Xia S. Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water. Micromachines. 2019; 10(4):223. https://doi.org/10.3390/mi10040223

Chicago/Turabian Style

Zhao, Shanshan, Jianhua Tong, Yang Li, Jizhou Sun, Chao Bian, and Shanhong Xia. 2019. "Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water" Micromachines 10, no. 4: 223. https://doi.org/10.3390/mi10040223

APA Style

Zhao, S., Tong, J., Li, Y., Sun, J., Bian, C., & Xia, S. (2019). Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water. Micromachines, 10(4), 223. https://doi.org/10.3390/mi10040223

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