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Interdigitated electrode with dense carbon nanotube forests on conductive supports for electrochemical biosensors

Abstract

Highly-sensitive interdigitated electrode (IDE) with vertically-aligned dense carbon nanotube forests directly grown on conductive supports was demonstrated by combining UV lithography and low temperature chemical vapor deposition process (470 °C). The cyclic voltammetry (CV) measurements of K4[Fe(CN)6] showed the redox current of IDE with CNT forests (CNTF-IDE) reached the steady state much more quickly compared to that of conventional gold IDE (Au-IDE). The performance of the CNTF-IDE largely depended on the geometry of the electrodes (e.g. width and gap). With the optimum three-dimensional electrode structure, the anodic current was amplified by a factor of ~18 and ~67 in the CV and the chronoamperometry measurements, respectively. The collection efficiency, defined as the ratio of the cathodic current to the anodic current at steady state, was improved up to 97.3%. The selective detection of dopamine (DA) under coexistence of L-ascorbic acid with high concentration (100 µM) was achieved with the linear range of 100 nM – 100 µM, the sensitivity of 14.3 mA mol-1 L, and the limit of detection (LOD, S/N = 3) of 42 nM. Compared to the conventional carbon electrodes, the CNTF-IDE showed superior anti-fouling property, which is of significant importance for practical applications, with a negligible shift of half-wave potential (ΔE1/2< 1.4 mV) for repeated CV measurement of DA at high concentration (100 µM).

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Publication details

The article was received on 22 Mar 2018, accepted on 05 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8AN00528A
Citation: Analyst, 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Interdigitated electrode with dense carbon nanotube forests on conductive supports for electrochemical biosensors

    H. Sugime, T. Ushiyama, Y. Ohno, K. Nishimura and S. Noda, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00528A

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