A Novel Flexible Electrochemical Ascorbic Acid Sensor Constructed by Ferrocene Methanol doped Multi‐walled Carbon Nanotube Yarn

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  • Yue Wang
    School of Chemical Engineering University of Science and Technology Liaoning 185 Qianshan Middle Road, High-tech Zone, Anshan Liaoning 114051 China
  • Jinping Wu
    School of Chemical Engineering University of Science and Technology Liaoning 185 Qianshan Middle Road, High-tech Zone, Anshan Liaoning 114051 China
  • Tian Yang
    School of Chemical Engineering University of Science and Technology Liaoning 185 Qianshan Middle Road, High-tech Zone, Anshan Liaoning 114051 China
  • Zhong Wang
    Alan G. MacDiarmid NanoTech Institute University of Texas at Dallas Richardson Texas 75080 United States
  • Yasushi Hasebe
    Department of Life Science and Green Chemistry Saitama Institute of Technology 1690 Fusaiji, Fukaya Saitama 369-0293 Japan
  • Tianhang Lv
    School of Chemical Engineering University of Science and Technology Liaoning 185 Qianshan Middle Road, High-tech Zone, Anshan Liaoning 114051 China
  • Zhiqiang Zhang
    School of Chemical Engineering University of Science and Technology Liaoning 185 Qianshan Middle Road, High-tech Zone, Anshan Liaoning 114051 China

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<jats:title>Abstract</jats:title><jats:p>An ascorbic acid (AA) electrochemical sensor was fabricated by ferrocene methanol (Fc−OH) modified multi‐walled carbon nanotube yarn (CNTY). The prepared sensor (Fc−OH/CNTY) exhibited outstanding flexibility, highly stretchability, excellent bendability and obviously electrocatalytic activity for oxidation of ascorbic acid. The morphology of Fc−OH/CNTY was evaluated by scanning electron microscope. The electrochemical behaviour of Fc−OH/CNTY sensor was studied by cyclic voltammetry and amperometry measurements. Moreover, the influence of Fc−OH concentration, applied potential and electrolyte solution pH were also investigated to obtain the best sensor performance. The prepared sensor exhibited a wide linear range from 3 μM to 3.0 mM toward AA, and a detection limit of 1.32 μM (S/N=3). It also possessed a good lifetime and a fast response speed (2.83 s). In addition, the Fc−OH/CNTY sensor remained 90 % and 60 % of its initial activity after 100 and 500 times bending, respectively, which indicated a potential application on flexible, implantable and/or wearable electrochemical sensors.</jats:p>

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