A Surface Modified Carbon Nanotube Fiber as a Microelectrode for the pH-Dependent Electrochemical Detection of Vitamin C
A pH-dependent electrochemical sensor based on nickel-cobalt oxide modified carbon nanotube fiber (NiCo-O@CNTF) has been fabricated via a simple electrochemical approach and utilized in the nonenzymatic detection of ascorbic acid (AA) with varying pH. Scanning electron microscopy (SEM), energy-dispersive electron microscopy (EDX), Raman, and FTIR were utilized to investigate the structural morphologies, elemental mapping, and electronic vibrational modes within the modified fiber (NiCo-O@CNTF) and revealed the successful fabrication of the electrode. Electrochemical characterization, including cyclic voltammetry and chronoamperometry, exhibited an enhanced anodic response in buffer solutions (varying pH), achieving a high sensitivity of 62.39 μA cm<sup>-2</sup> mM<sup>-1</sup>, a low detection limit of 16 μM, and a rapid response time of 5 s at pH 8.0. These results highlight NiCo-O@CNTF as a flexible and disposable microelectrode platform for wearable AA sensing applications.
Authors
- Amel Y. Ahmed
- Rizwan Shoukat (ORCID: https://orcid.org/0000-0002-4071-533X)
- Salih Akyürekli
- Muhammad Ahmad (ORCID: https://orcid.org/0000-0002-3313-0632)
- Murat Kaleli
- Abid Ali (ORCID: https://orcid.org/0000-0002-0452-4827)
- Warda Mansur
Institutions
- University of Lahore (PK)
- University of Cagliari (IT)
- Suleyman Demirel University (KZ)
- Steris (United States) (US)
- Government College University, Lahore (PK)
- King Faisal University (SA)
- University of Education (PK)
Publication Details
- Journal
- ACS Omega
- Published
- 2025-09-01
- DOI
- https://doi.org/10.1021/acsomega.5c05410
- Citations
- 3
- Primary Topic
- Electrochemical sensors and biosensors
- Type
- article
- Field-Weighted Citation Impact
- 2.19
Funders
- King Faisal University