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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- 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
- Lim, Yeongjin; Heo, Jeong-Il; Shin, Heungjoo
- C-MEMS; Carbon nanowire-based mesh; Redox cycling; Stacked electrode set; Suspended electrode
- Issue Date
- ELSEVIER SCIENCE SA
- SENSORS AND ACTUATORS B-CHEMICAL, v.192, no., pp.796 - 803
- 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.
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