Full Papers

Study on Micro-sensing Chip of Nitrate Based on Three-dimensional Nano-structured Silver Modified Electrode

  • HU Jing-Fang ,
  • SUN Ji-Zhou ,
  • BIAN Chao ,
  • TONG Jian-Hua ,
  • LI Yang ,
  • XIA Shan-Hong
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  • a State Key Laboratory of Transducer Technology, Institute of Electronics/Chinese Academy of Sciences, Beijing 100080;
    b Graduate University of Chinese Academy of Sciences/Beijing 100080

Received date: 2011-10-28

  Revised date: 2011-11-18

  Online published: 2011-11-30

Supported by

National Basic Research Program of China (973 Program) (No. 2009CB320300), National Water Pollution Control and Management Technology Major Projects (No. 2009ZX07527-007) and the National Natural Science Foundation Program of China (No. 60971070).

Abstract

A new type of micro amperometric sensing chip based on gold interdigitated microband array (IDA) electrode for trace nitrate determination was developed in this paper. The IDA as working electrode was fabricated with micro-electro-mechanical systems (MEMS) technology. Three-dimensional (3D) nano-structured dendritic silver was electrochemically deposited on the IDA electrode surface, which showed superior electrocatalytic reduction of nitrate than silver nanoparticle modified IDA and regular silver wire electrode. The experiment results demonstrated that the proposed chip showed high sensitivity (9.5 nA/(μmol/L), within a concentration range of 25~1000 μmol/L (R2=0.9998) and low detection limit (10 μmol/L) using square-wave voltammetry method. Interference analysis with 8 kinds of ions ( NO2-, F-, PO43- , SO42- , CO32- , NH4+ , Na+and K+) commonly found in surface water indicated that the microchips in this paper had good selectivity to NO3- . It was noteworthy that the 3D nano-structured dendritic silver as sensing film modified on IDA electrode could electrochemically reduce nitrate at a pH range of 5.0~9.0 which is important for further study of field and real-time monitoring nitrate ions in natural water.

Cite this article

HU Jing-Fang , SUN Ji-Zhou , BIAN Chao , TONG Jian-Hua , LI Yang , XIA Shan-Hong . Study on Micro-sensing Chip of Nitrate Based on Three-dimensional Nano-structured Silver Modified Electrode[J]. Acta Chimica Sinica, 2012 , 70(03) : 291 -296 . DOI: 10.6023/A1110013

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