Apart from national security and military purposes, it is also of great importance to detect Picric Acid (PA) in aqueous solution for pollution control. Herein, we report for the first time a viable and inexpensive gold nanoparticle (GNP)-based sensor for rapid detection of PA in aqueous condition based on plasmon enhanced fluorescence of Polyallylamine Hydrochloride (PAH). The enhanced emission is observed when PAH is incubated with ~ 40 nm Au@SiO<sub>2</sub> nanoparticle, where silica shell controls the crucial distance between gold core and PAH. We witness, that the enhancement in fluorescence is accompanied with large reduction in lifetime, signifying the mechanism to be predominantly derived from the enhancement of intrinsic radiative decay rate of PAH. The sensor shows excellent selectivity for detection of PA in water, among the set of twelve congeners via remarkable fluorescence quenching. The quenching phenomena is believed to occur due to the efficient charge transfer process from the sensor to the PA. The detection limit of the sensor in the linear range is calculated to be 0.3 µM.

Gold nanoparticle-based plasmon enhanced fluorescence of polyallylamine hydrochloride: An efficient and selective sensor for picric acid in aqueous media

2019 Fall National Meeting

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