Controlling the luminescent intensity of gold quantum dots by the plasmonic effect of silver nanoprisms

摘要

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 luminescent intensity of gold quantum dots (AuQDs) was controlled by the localized surface plasmon resonance of silver nanoprisms (AgNPrs). The quenching was modulated by the degre e of spectral overlap between the photoluminescence band of AuQDs and the dipole plasmon resonance of AgNPrs. Furthermore, an in-situ controlled quenching effect of AuQDs using an oxidative etching reaction of AgNPrs by hydrogen peroxide (H_2O_2) was demonstrated. This technique was further developed for application as a H_2O_2 sensor. This system was capable of detecting 1 nM H_2O_2 in an aqueous solution.