Abstract

Plasmonic nanostructures can be used to control the photoluminescence properties of various emitting materials. In this work, an efficient plasmon-induced energy transfer (quenching) was investigated. The luminescence intensity of gold quantum dots (AuQDs) was controlled by the localized surface plasmon resonance of silver nanoprisms (AgNPrs). The quenching was modulated by the degree of spectral overlap between the photoluminescence band of AuQDs and the dipole plasmon resonance of AgNPrs. An in-situ controlled quenching effect of AuQDs using an oxidative etching reaction of AgNPrs by hydrogen peroxide (H2O2) was demonstrated. Time-dependence of the luminescence intensity and the absorption intensity at 511 nm of AuQDs solutions mixed with AgNPrs-500 and AgNPrs-560 under oxidative etching of AgNPrs by H2O2 are shown in Figures 1A and 1B, respectively. These results represent that matching energy levels plays an important role in the energy transfer process in the AuQDs and AgNPrs system. This technique was further developed for application as a H2O2 sensor. This system was capable of detecting 1 nM H2O2 in an aqueous solution.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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