A novel hydrogen peroxide sensor based on Ag nanoparticles decorated polyaniline/graphene composites

A novel electrochemical sensor based on Ag nanoparticles (AgNPs) decorated polyaniline/graphene composites (PANI/G) is developed, which can be used for sensitive determination of H 2 O 2 . For the construction of the H 2 O 2 sensor, polyaniline (PANI) is first electrodeposited on the surface of graphene (G) to form PANI/G, and then horseradish peroxidase (HRP) loaded on AgNPs (HRP/AgNPs) is immobilized on to the PANI/G. H 2 O 2 can be catalyzed by HRP to generate current response which can be significantly enhanced by AgNPs, and thus the PANI/G based sensor can be utilized for the detection of H 2 O 2 . Under the optimized conditions, the proposed H 2 O 2 sensor exhibits wide linear response to H 2 O 2 concentration ranging from 0.25 to 2.25 m M with a detection limit of 0.03 m M (signal-to-noise ratio of 3), and it also shows high selectivity and reproducibility. The method is simple and cost-effective, and can be a promising candidate as the sensitive sensing platform for H 2 O 2 . © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42409.