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

• Published in: Electroanalysis (New York, N.Y.) N.Y.), 2021-12, Vol.33 (12), p.2445-2451
• Main Authors: Wang, Yue, Wu, Jinping, Yang, Tian, Wang, Zhong, Hasebe, Yasushi, Lv, Tianhang, Zhang, Zhiqiang
• Format: Article
• Language: English
• Subjects: ascorbic acid; carbon nanotube yarn; ferrocene methanol; flexible electrochemical sensor
• ISSN: 1040-0397; 1521-4109
• DOI: 10.1002/elan.202100322

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.