A novel non-enzymatic hydrogen peroxide sensor based on Co:ZnO modified electrodes

There is currently intense interest in the use of nanoparticles for a wide range of biomedical and technological applications. In this paper, the hierarchical Co doped ZnO nanoflowers were synthesized by a facile wet chemical method and explored as biosensing material. The as-modified novel hydrogen peroxide sensor exhibited a wide linear range (0.25–20?mM), highly reproducible response (R.S.D. of 2.7%) and long-term stability. The doping Co²⁺ ions carried out the oxidations rapidly and efficiently for the catalysis of hydrogen peroxide (H₂O₂). A high activity toward H₂O₂ in the presence of ascorbic acid (AA) and NaNO₂, which are only common for natural enzymes, has also been demonstrated. The good analytical performance, low cost and straightforward preparation method makes this doped semiconductor promising for a wide range of potential applications in medicine, biotechnology and environmental chemistry.