In situ growth of CuS decorated graphene oxide-multiwalled carbon nanotubes for ultrasensitive H2O2 detection in alkaline solution

Abstract

In this paper, a CuS/graphene oxide (GO)/multiwalled carbon nanotube (MWCNT) nanocomposite was prepared for the first time for ultrasensitive electrochemical non-enzymatic H₂O₂ detection in the alkaline environment. The morphology and microstructure of the CuS/GO/MWCNT nanocomposite were systematically characterized, in which the novel hybrid architectures of the nanoparticles, nanotubes and nanosheets are determined. As a result, the as-fabricated electrochemical sensor exhibits an excellent H₂O₂ amperometric response with a wide linear range from 0.45 mM to 60 mM, a low detection limit of 0.6 μM and an ultra-high sensitivity of 386 μA mM⁻¹ cm⁻². Besides, the long-term stability and outstanding reproducibility were also evaluated, suggesting the promising potential for the determination of H₂O₂ in practical applications.