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Shin, Heungjoo
Micro/Nano Integrated Systems (MNIS) Lab
Research Interests
  • Carbon-MEMS
  • Nanofabrication
  • Gas sensors
  • Biosensors
  • Electrochemical sensors
  • SPM

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Fabrication and application of a stacked carbon electrode set including a suspended mesh made of nanowires and a substrate-bound planar electrode toward for an electrochemical/biosensor platform

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Title
Fabrication and application of a stacked carbon electrode set including a suspended mesh made of nanowires and a substrate-bound planar electrode toward for an electrochemical/biosensor platform
Author
Lim, YeongjinHeo, Jeong-IlShin, Heungjoo
Issue Date
2014-03
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.192, pp.796 - 803
Abstract
Herein, we present a novel electrochemical sensing platform that consists of a set of suspended carbon nanowire-based mesh electrode with deliberately controlled shapes (hexagonal or diamond), and a substrate-bound planar carbon electrode. These electrodes overlapped one another with a pre-defined gap which was precisely controlled by using a polymerization-stop layer. By recycling the redox reactions between the electrodes with a 2.1-μm-gap, the redox current of Fe(CN)6 4-/Fe(CN)6 3- could be amplified approximately 37 times. This high current amplifying capability enabled dopamine detection down to 5 μM using cycling voltammetry. The complex morphology of the stacked carbon structures was obtained by simply using multiple UV-lithography processes and a single pyrolysis process that allowed pre-defined polymer structures to shrink into sub-micrometer-scale carbon structures. The suspended carbon mesh structures confined the mass-transfer near the electrode overlap region, and hence, the electrode set operated as a "sandwich" electrode enclosed within a microchannel. This effect was studied by simulating the mass transfer of the redox species, and confirmed by electrochemical measurements.
URI
https://scholarworks.unist.ac.kr/handle/201301/3967
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84890278562
DOI
10.1016/j.snb.2013.11.065
ISSN
0925-4005
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