Highly sensitive and selective thiourea electrochemical sensor based on novel silver nanoparticles/chitosan nanocomposite

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 644; p. 128879
• Main Authors: Rashed, Md. A., Ahmed, Jahir, Faisal, M., Alsareii, S.A., Jalalah, Mohammed, Harraz, Farid A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.07.2022
• Subjects: Chitosan; Sensor; Silver nanoparticles; Thiourea; Voltammogram; Thiourea; Chitosan; Voltammogram; Silver nanoparticles; Sensor
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2022.128879

Herein, we have proposed a thiourea sensor using a novel silver decorated chitosan (Ag@CTSN) nanocomposite modified glassy carbon electrode (GCE). The catalyst was fabricated using a simple photo-reduction technique. In where, chitosan surface was decorated with silver nanoparticles via the photochemical reduction of silver salt to obtain Ag@CTSN nanocomposite. The morphology and structural properties of fabricated electrocatalyst was successfully characterized using advanced analytical techniques and reviled that silver nanoparticles was nicely dispersed over the host matrix; chitosan. Morphological study shown the non-aggregated form of silver nanoparticles with an average diameter of 20.85 nm. In the electrochemical investigations, the Ag@CTSN/GCE sensor showed good sensitivity of 15.88 µAmM−1 cm−2, a wide detection range (200–3600 µM), and a low limit of detection (LOD ~18 μM). The newly developed thiourea sensor was further used to check the potential chemical interference using several common chemicals, presenting an extreme selectivity in thiourea detection. The Ag@CTSN/GCE sensor also exhibited ⁓100% recovery results from spiked real samples. Excellent reproducibility, repeatability, and operational and storage stability was observed in the newly fabricated sensor. [Display omitted]