A selective hydrogen peroxide sensor based on chemiresistive polyaniline nanowires modified with silver catalytic nanoparticles
This paper presents a novel method to selectively detect hydrogen peroxide using a chemiresistive polyaniline nanowire network. The polyaniline nanowires modified with silver catalytic nanoparticles were demonstrated to give selective responses to hydrogen peroxide by changing the conductivity of the polyaniline. The proposed mechanism for the selectivity in the H2O2 sensing is based on a catalytic reaction between the silver nanoparticles and the hydrogen peroxide which generates hydroxide ions and water to influence the conductivity of polyaniline. The catalytic effect of the silver nanoparticles was confirmed by characterizing the relationship between the amount of catalysts and the current response. The results indicate that the rate of the catalytic reaction is proportional to the number of silver nanoparticles attached on the surfaces of polyaniline. By observing the conductance change, the developed chemiresistive sensor was able to selectively detect H2O2 while exhibiting minimal response to other chemical species. The objective of this paper is to address the selectivity issue of a chemiresistor by suggesting a catalyst-based selective detection of an analyte for a polyaniline-based chemiresistive sensor. This technology may have potential applications in microscale or microfluidic chemical and biological sensors requiring a selective detection of hydrogen peroxide concentrations. © 2014 IOP Publishing Ltd.
Publication Source (Journal or Book title)
Journal of Micromechanics and Microengineering
Song, E., & Choi, J. (2014). A selective hydrogen peroxide sensor based on chemiresistive polyaniline nanowires modified with silver catalytic nanoparticles. Journal of Micromechanics and Microengineering, 24 (6) https://doi.org/10.1088/0960-1317/24/6/065004