Carbon nanotube modified laser-induced graphene electrode for hydrogen peroxide sensing

•Laser-induced graphene (LIG) electrodes can be engraved on a polymeric substrate in a single step and mask-free.•The proposed MWCNT-modified LIG electrodes demonstrated good electrochemical behavior with enhanced sensitivity.•The fabricated LIG sensors exhibited linear characteristics in the H2O2 concentration ranging up to 12 mM. In this study, laser-induced graphene (LIG) electrode was fabricated and characterized to detect hydrogen peroxide (H2O2). The CO2 laser was used to develop LIG electrodes on a polyimide (PI) film by laser irradiation. This fabrication process allows to engrave conducting electrodes on a polymeric substrate in a single step. In order to increase the detection sensitivity, the LIG electrode surface was modified with multi-walled carbon nanotubes (MWCNT). Cyclic voltammetry and chronoamperometry measurements were performed to analyze the LIG sensor response for different concentrations of H2O2. The LIG sensors exhibited linear characteristics in the H2O2 concentration ranging from 2 mM to 12 mM. The proposed MWCNT-modified LIG sensor exhibited excellent electrochemical performance with high sensitivity. Thus, laser-induced graphene electrode incorporated with MWCNT is highly promising for disposable H2O2 sensing applications.