A highly sensitive hydrogen peroxide amperometric sensor based on MnO2 nanoparticles and dihexadecyl hydrogen phosphate composite film

A sensitive sensor for the determination of hydrogen peroxide (H2O2) was fabricated with MnO2 nanoparticles (nano-MnO2) and dihexadecyl hydrogen phosphate (DHP) composite film. The sensor exhibits high sensitivity, due to the enhanced oxidation of hydrogen peroxide (H2O2) at the MnO2 nanoparticles and its uniform dispersion in DHP film. Amperometry was carried to determine the concentration of H2O2. The dependence of the response current on H2O2 concentration was explored under optimal conditions and an excellent linear concentration range of 1.2 x 10(-7)-2.0 x 10(-3) M with a substantially low detection limit of 8.0 x 10(-8) M was obtained. The proposed nano-MnO2/DHP sensor has the feature of high sensitivity of 2.66 x 10(5) mu A M-1 cm(-2). This sensor has been applied to measure the concentration of H2O2 in tooth paste and hair dye. According to the principle of Sensors with injectable recognition elements (SIRE), trace concentration of glucose in urine samples can also be calculated. (c) 2005 Elsevier B.V. All rights reserved.