Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/15138
Title: Three-dimensional nano-structured silver on gold interdigitated microband array electrode for nitrate determination
Authors: Hu, Jingfang
Sun, Jizhou
Bian, Chao
Tong, Jianhua
Zia, Shanhong
Keywords: 3D nano-structured silver
Interdigitated microband array electrode
Micro-electro-mechanical systems
Nitrate determination
Issue Date: Nov-2012
Publisher: NISCAIR-CSIR, India
Abstract: <span style="font-size:9.0pt;mso-ansi-language: EN-US" lang="EN-US">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/μ<span style="font-size:9.0pt; mso-ansi-language:EN-US" lang="EN-US">mol/L, limit of detection of 10 μmol/L, detection dynamic range of 10-1000 μ<span style="font-size:9.0pt;mso-ansi-language:EN-US" lang="EN-US">mol/L , and linear range of 25-1000 μ<span style="font-size:9.0pt;mso-ansi-language:EN-US" lang="EN-US">mol/L nitrate (R<sup>2</sup>=0.9998). Interference analysis with 9 kinds of ions (NO<sub>2</sub><sup><span style="font-size:9.0pt;mso-fareast-font-family:" ms="" mincho";="" mso-ansi-language:en-us"="" lang="EN-US">−</span></sup><span style="font-size:9.0pt; mso-ansi-language:EN-US" lang="EN-US">, F<sup><span style="font-size:9.0pt; mso-fareast-font-family:" ms="" mincho";mso-ansi-language:en-us"="" lang="EN-US">−</span></sup><span style="font-size:9.0pt;mso-ansi-language:EN-US" lang="EN-US">, PO<sub>4</sub><sup>3−</sup>, H<sub>2</sub>PO<sub>4</sub><sup><span style="font-size:9.0pt; mso-fareast-font-family:" ms="" mincho";mso-ansi-language:en-us"="" lang="EN-US">−</span></sup><span style="font-size:9.0pt;mso-ansi-language:EN-US" lang="EN-US">, SO<sub>4</sub><sup>2−</sup>, CO<sub>3</sub><sup>2−</sup>, NH<sub>4</sub><sup>+</sup>, Na<sup>+ </sup>and K<sup>+</sup>) commonly found in surface water indicates that the proposed microchips have good selectivity to NO<sub>3</sub><sup><span style="font-size:9.0pt;mso-fareast-font-family:" ms="" mincho";mso-ansi-language:="" en-us"="" lang="EN-US">−</span></sup><span style="font-size:9.0pt;mso-ansi-language: EN-US" lang="EN-US">. 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. </span></span></span></span></span></span></span></span>
Description: 414-419
URI: http://hdl.handle.net/123456789/15138
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.19(6) [November 2012]

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