Publication: AAO-CNTs electrode on microfluidic flow injection system for rapid iodide sensing
Issued Date
2011-06-15
Resource Type
ISSN
00399140
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2-s2.0-79958133658
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Mahidol University
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SCOPUS
Bibliographic Citation
Talanta. Vol.84, No.5 (2011), 1390-1395
Suggested Citation
Ditsayut Phokharatkul, Chanpen Karuwan, Tanom Lomas, Duangjai Nacapricha, Anurat Wisitsoraat, Adisorn Tuantranont AAO-CNTs electrode on microfluidic flow injection system for rapid iodide sensing. Talanta. Vol.84, No.5 (2011), 1390-1395. doi:10.1016/j.talanta.2011.03.071 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11712
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Title
AAO-CNTs electrode on microfluidic flow injection system for rapid iodide sensing
Abstract
In this work, carbon nanotubes (CNTs) nanoarrays in anodized aluminum oxide (AAO-CNTs) nanopore is integrated on a microfluidic flow injection system for in-channel electrochemical detection of iodide. The device was fabricated from PDMS (polydimethylsiloxane) microchannel bonded on glass substrates that contains three-electrode electrochemical system, including AAO-CNTs as a working electrode, silver as a reference electrode and platinum as an auxiliary electrode. Aluminum, stainless steel catalyst, silve r and platinum layers were sputtered on the glass substrate through shadow masks. Aluminum layer was then anodized by two-step anodization process to form nanopore template. CNTs were then grown in AAO template by thermal chemical vapor deposition. The amperometric detection of iodide was performed in 500-μm-wide and 100-μm-deep microchannels on the microfluidic chip. The influences of flow rate, injection volume and detection potential on the current response were optimized. From experimental results, AAO-CNTs electrode on chip offers higher sensitivity and wider dynamic range than CNTs electrode with no AAO template. © 2011 Elsevier B.V. All rights reserved.