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|Title:||Three-dimensional nano-structured silver on gold interdigitated microband array electrode for nitrate determination|
|Keywords:||3D nano-structured silver|
Interdigitated microband array electrode
|Abstract:||A new type of micro amperometric sensing chip based on gold interdigitated microband array (Au-IDA) electrode for trace nitrate determination has been developed. The Au-IDA microelectrode is fabricated with micro-electro-mechanical systems technology. Three-dimensional (3D) nano-structured dendritic silver is electrochemically deposited on the Au-IDA microelectrode surface, which shows superior electrocatalysis property in facilitating nitrate reduction. The results show that the sensing chip has a sensitivity of 9.5 nA/μmol/L, limit of detection of 10 μmol/L, detection dynamic range of 10-1000 μmol/L , and linear range of 25-1000 μmol/L nitrate (R2=0.9998). Interference analysis with 9 kinds of ions (NO2−, F−, PO43−, H2PO4−, SO42−, CO32−, NH4+, Na+ and K+) commonly found in surface water indicates that the proposed microchips have good selectivity to NO3−. It is noteworthy that the proposed 3D nano-structured dendritic silver modified Au-IDA microelectrode could be used for nitrate analysis in neutral media which is important for field and real-time monitoring nitrate ions in natural water.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.19(6) [November 2012]|
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