An insight of light-enhanced electrochemical kinetic behaviors and interfacial charge transfer of CuInS 2 /MoS 2 -based sensing nanoplatform for ultra-sensitive detection of chloramphenicol

• Published in: Analytica chimica acta 2023-08, Vol.1270, p.341475
• Main Authors: Pham, Tuyet Nhung, Van Hoang, Ong, Van Manh, Tien, Trang, Nguyen Le Nhat, Oanh, Vu Thi Kim, Lam, Vu Dinh, Phan, Vu Ngoc, Le, Anh-Tuan
• Format: Article
• Language: English
• ISSN: 1873-4324

Owing to the effective combination between MoS sheets with CuInS nanoparticles (NPs), a direct Z-scheme heterojunction was successfully constructed and proved as a promising structure to modify the working electrode surface with the aim of enhancing overall sensing performance towards CAP detection. Herein, MoS was employed as a high mobility carrier transport channel with a strong photo-response, large specific surface area, and high in-plane electron mobility, while CuInS acted as an efficient light absorber. This not only offered a stable nanocomposite structure but also created impressive synergistic effects of high electron conductivity, large surface area, highlight exposure interface, as well as favorable electron transfer process. Moreover, the possible mechanism and hypothesis of the transfer pathway of photo-induced electron-hole pairs on the CuInS -MoS /SPE as well as their impacts on the redox reaction of K /K probes and CAP were proposed and investigated in detail via a series of calculated kinetic parameters, demonstrating the high practical applicability of light-assisted electrodes. Indeed, the detection concentration range of the proposed electrode was widened from 0.1 to 50 μM, compared with that of 1-50 μM without irradiation. Also, the LOD and sensitivity values were calculated to be approximately 0.06 μM and 0.4623 μA μM , which is better than that of 0.3 μM and 0.095 μA μM without irradiation.