A highly sensitive hydrogen peroxide amperometric sensor based on MnO_2 nanoparticles and dihexadecyl hydrogen phosphate composite film

摘要

A sensitive sensor for the determination of hydrogen peroxide (H_2O_2)was fabricated with MnO_2 nanoparticles (nano-MnO_2)and dihexadecyl hydrogen phosphate (DHP)composite film.The sensor exhibits high sensitivity, due to the enhanced oxidation of hydrogen peroxide (H_2O_2)at the MnO_2 nanoparticles and its uniform dispersion in DHP film.Amperometry was carried to determine the concentration of H_2O_2 .The dependence of the response current on H_2O_2 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-MnO_2/ DHP sensor has the feature of high sensitivity of 2.66 x 10~5 muAM~(-1)cm~(-2).This sensor has been applied to measure the concentration of H_2O_2 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.