Structure and Electrochemical Properties of Nitrogen Containing Nanocarbon Films and Their Electroanalytical Application

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  • OHTA Saki
    Saitama Institute of Technology
  • SHIBA Shunsuke
    Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
  • KAMATA Tomoyuki
    Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology
  • KATO Dai
    Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology
  • YAJIMA Tatsuhiko
    Saitama Institute of Technology
  • NIWA Osamu
    Saitama Institute of Technology

Bibliographic Information

Other Title
  • 窒素化ナノカーボン薄膜の構造，電気化学特性と分析への応用
  • チッソカ ナノカーボン ハクマク ノ コウゾウ,デンキ カガク トクセイ ト ブンセキ エ ノ オウヨウ

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Abstract

<p>Nanocarbon films fabricated by using unbalanced magnetron (UBM) or electron cyclotron resonance (ECR) sputtering show a wide potential window and high stability. We fabricated nitrogen-doped nanocarbon film electrodes by using sputtering in the presence of N2 gas, a heat treatment in the presence of ammonia (NH3), and a plasma treatment using NH3 vapor. The nitrogen concentration, sp2/sp3 ratio and the structure of nitrogen-containing surface functional groups of the carbon films were dependent on the fabrication methods and plasma treatment conditions, such as the nitrogen or ammonia gas concentrations, which caused a positive shift of the oxygen reduction reaction (ORR) potential. For detecting biomolecules, the oxidation peaks of nicotinamide adenine dinucleotide (NADH) and L-ascorbic acid shifted to more negative potentials. Furthermore, the UBM carbon film showed improved biocompatibility after a NH3 plasma treatment since the ΔE of ferrocyanide ([Fe(CN)6]3−) showed excellent redox properties with very small ΔE increase, even in a solution containing a large concentration of bovine serum albumin (BSA). The magnitude of the current for serotonin oxidation (neurotransmitter) was almost unchanged by continuous CV measurements, although the oxidation product of serotonin is adsorptive to the electrode surface. The UBM sputtered nanocarbon film introduced nitrogen-containing functional groups onto the surface, which suggests an anti-fouling property by the adsorption of serotonin oxidized products and proteins.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 70 (9), 511-520, 2021-09-05

    The Japan Society for Analytical Chemistry

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