Electrochemical sensing of glucose and ascorbic acid via POM-based CNTs fiber electrode

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2023-07, Vol.293, p.116446, Article 116446
• Main Authors: Muqaddas, Sheza, Aslam, Hira, Ul Hassan, Sadaf, Raza Ashraf, Ahmad, Adeel Asghar, Muhammad, Ahmad, Muhammad, Nazir, Arif, Shoukat, Rizwan, Kaleli, Murat, Mostafa Ibrahim, Sobhy, kyürekli, Salih, Haider, Ali, Ali, Abid
• Format: Article
• Language: English
• Subjects: Ascorbic acid; Biosensors; CNTs fibers; Glucose; Polyoxometalates
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2023.116446

Wells-Dawson type cobalt-based POM (Co-POM) has been deposited over flexible fiber-shaped carbon nanotube (CNTs fiber) via drop-casting method followed by thermal treatment and employed as an electrochemical sensor for the detection of glucose and ascorbic acid in basic media. SEM images verified the homogenous covering of Co-POM over the surface of CNTs fiber, with crystalline structure. Electrochemical response of fabricated electrode was investigated via cyclic voltammetry and chronoamperometry in 0.1 M KOH solution. Electro-oxidation of glucose showed high sensitivity of 1000 µAmM-1cm−2, lower limit of detection 0.42 µM and broad linear range of up to 23 mM with shorter response time of about 4 s. The Co-POM/CNTs fiber was also evaluated for the estimation of ascorbic acid and results showed the boosted sensors performance with a 300 µAmM-1cm−2 of sensitivity, 0.10 µM limit of detection and 10 mM linear range with a response time of 5 s. [Display omitted] •A facile fabrication of Wells-Dawson based POM over CNTs fiber has been reported.•Fabricated electrocatalyst has been employed electrochemical sensor.•It demonstrated high sensitivity, lower LOD and better linear range. Wells-Dawson type cobalt-based Polyoxometalate(Co-POM) was deposited over carbon nanotube (CNTs) fiber and employed as an electrochemical sensor for the detection of glucose and ascorbic acid in basic media. Surface morphology and elemental composition of the developed electrodewas studied by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). SEM images verified the homogenous covering of Co-POM over the surface of CNTs fiber. Electrochemical response of fabricated electrode was investigated via cyclic voltammetry and chronoamperometry in 0.1 M KOH solution. Electro-oxidation of glucose showed high sensitivity of 1000 µAmM-1cm−2, low limit of detection 0.42 µM and broad linear range of up to 23 mM with short response time of about 4 s. Furthermore,the fabricated electrode showed boosted sensingperformance forascorbic acidwith a sensitivity of 300 µAmM-1cm−2, detection limit of0.10 µMand 10 mM linear range with a response time of 5 s.