Localized surface plasmon resonance optical characteristics for hydrogen peroxide using polyvinylpyrrolidone coated silver nanoparticles

In this study, monitoring of localized surface plasmon resonance (LSPR) optical characteristics and dispersion condition change for hydrogen peroxide using polyvinylpyrrolidone (PVP)-coated silver nanoparticles (NPs) was described. PVP-coated silver NPs exhibit the specific light absorption in visible region. Hence, using LSPR optical characteristics, several applications such as optoelectronics, food control and life science can be realized. In addition, by introducing hydrogen peroxide solution into the PVP-coated silver NP dispersion, LSPR optical characteristics were drastically changed. From these LSPR optical characteristic changes of PVP-coated silver NPs for hydrogen peroxide, in this study, observation of dispersion kinetics of PVP-coated silver NPs was carried out. As a result, aggregation which is attributed by the radical polymerization of PVP layer could be observed by introduction of hydrogen peroxide. In addition, silver cluster structure which is included in the PVP layer was stably contained in the aggregated PVP layer. From these optical characteristic change and dispersion kinetics, this PVP-coated silver NPs have great potential for application to biosensing applications as a color indicator.