Fabrication of non-enzymatic sensor using Co doped ZnO nanoparticles as a marker of H2O2

•Co doped ZnO nanoparticles.•Reusable and selective sensor.•Eco-friendly material.•High sensitivity.•Good candidate for health monitoring.

Co doped ZnO nanoparticles were prepared by a simple thermal method and their functional relationships with H2O2 sensing were investigated. The sensing potential of Co doped ZnO nanoparticles were investigated using cyclic voltammeter. Co doped ZnO nanoparticles were characterized by FESEM, EDS, XRD, FTIR and XPS. The data obtained from the sensing study showed that Co doped ZnO nanoparticles are more sensitive toward H2O2. The results suggested that Co doped ZnO nanoparticles displayed tremendous electro-catalytic property for the reduction of H2O2. The performance of the sensor was further optimized using various pH and different scan rates. The developed sensor displayed high sensitivity (92.4444 μA mM−1 cm−2) and lower limit of detection (14.3 μM). Thus Co doped ZnO nanoparticles could be potential material for the construction of sensitive and efficient hydrogen peroxide sensor.

Graphical abstractCo doped ZnO nanoparticles based efficient hydrogen peroxide sensor was fabricated. Figure optionsDownload full-size imageDownload as PowerPoint slide