Hydrogen peroxide sensor based on carbon nanowalls grown by plasma-enhanced chemical vapor deposition

Fabrication of an electrochemical sensor for hydrogen peroxide (H 2 O 2 ) detection was demonstrated. H 2 O 2 is a major messenger molecule in various redox-dependent cellular signaling transductions. Therefore, sensitive detection of H 2 O 2 is greatly important in health inspection and environmental protection. Carbon nanowalls (CNWs) are composed of few-layer graphenes standing almost vertically on a substrate forming a three-dimensional structure. In this work, CNWs were used as a platform for H 2 O 2 sensing, which is based on the large surface area of conducting carbon and surface decoration with platinum (Pt) nanoparticles (NPs). CNWs were grown on carbon fiber paper (CFP) by inductively coupled plasma-enhanced chemical vapor deposition to increase the surface area. Then, the CNW surface was decorated with Pt-NPs by the reduction of H 2 PtCl 6 . Cyclic voltammetry results indicate that the Pt-decorated CNW/CFP electrode possesses excellent electrocatalytic activity for the reduction of H 2 O 2 . Amperometric responses indicate the high-sensitivity detection capability of the Pt-decorated CNW/CFP electrode for H 2 O 2 .