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

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.