Fabrication of CuS-MoO3 nanocomposite for high-performance photocatalysis and biosensing

• Published in: Journal of molecular structure 2025-03, Vol.1324, p.140823, Article 140823
• Main Authors: Kumar, E. Vinay, Soundarya, T.L., Kumara Swamy, B.E., Anitha, Nagaraju, G.
• Format: Article
• Language: English
• Subjects: Biosensing; Dopamine; Green combstion synthesis; Photocatalysis; Rose Bengal
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2024.140823

•Fabrication of CuS-MoO₃ nanocomposite using a wet impregnation process.•Superior photocatalytic activity for the degradation of hazardous dyes and Rangoli colorants.•Enhanced electrochemical sensing performance for dopamine detection with an LOD of 6.61 µM.•Demonstration of improved charge separation and reduced recombination rates, leading to high-performance photocatalysis and biosensing. The design and development of highly efficient nanostructure materials for photocatalytic and electrochemical applications is very necessary. In this study, CuS-MoO3 nanocomposite (NCs) was fabricated using a simple wet impregnation process and the photodegradation potential for 8 major hazardous dyes and electrochemical sensing of Dopamine was investigated. X-ray diffraction (XRD), Fourier transform - Infrared spectroscopy (FTIR), UV-Vis spectroscopy (UV-Vis), Photoluminescence spectroscopy (PL), Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX) and Transmission Electron Microscopy (TEM) were employed for characterization. Fabricated NCs are made up of CuS in the hexagonal phase and MoO3 in the orthorhombic phase, both of which react to UV light. Optical and electrochemical impedance spectroscopy (EIS) results show that improved photocatalytic performance is related to increased UV light spectrum sensitivity, inhibited charge carrier recombination, and decreased band gap energy in the NCs. Experimental findings showed that CuS-MoO3 (CMS) NCs had substantially more photocatalytic degradation activity than pure MoO3 and CuS nanoparticles (NPs). The prepared CMS NCs were then used for electrochemical analysis of Dopamine (DA). Electroanalytical results showed that the CMS NCs had enhanced electrochemical activity towards DA. The constructed sensor has a limit of detection of (6.61 µM) and proved that it is capable of being a sensor. [Display omitted]