Novel gallium-based voltammetric sensor for sensitive detection of cysteine


Selcuk K., Caglar A., Aktaş N., DEMİR KIVRAK H.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol.169, 2022 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 169
  • Publication Date: 2022
  • Doi Number: 10.1016/j.jpcs.2022.110836
  • Journal Name: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC, Metadex
  • Keywords: Gallium, Carbon nanotubes, Chemisorption, Cysteine, Sensor, WALLED CARBON NANOTUBES, PEROXIDASE-LIKE ACTIVITY, SPECTROMETRIC DETERMINATION, ELECTROCHEMICAL SENSOR, COLORIMETRIC DETERMINATION, GOLD NANOPARTICLES, ELECTRODE, PERFORMANCE, OXIDATION, CATALYSTS

Abstract

Carbon nanotube-supported gallium (Ga/CNT) was synthesized and characterized with energy dispersive X-ray scanning electron microscopy, temperature-programmed reduction, temperature-programmed oxidation, and temperature-programmed desorption methods. Characterization results revealed successful preparation of Ga/ CNT. Electrochemical measurements were performed by cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The Ga/CNT-based cysteine sensor had a linear response within the range of 0-200 mu M with current sensitivity of 0.0081 mu A/mu M (114 mu A/mM cm(2)), low detection limit of 0.05 mu M, and signal-to-noise ratio of 3. Interference studies revealed that (Ga/CNT)@glassy carbon electrode was not affected by interfering species. Thus, Ga/CNT is a promising cysteine sensor.