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Light Intensity Field Enhancement (LIFE) Induced Localized Edge Abrasion of Silica-Coated Silver Nanoprisms

Abstract

Silver nanoprisms (AgNPrs) exhibit localized surface plasmon resonance (LSPR) in the near infrared (NIR) region of electromagnetic spectra. LSPR driven electric field enhancement around AgNPr edges have been subjected to various studies. A coating of dielectric materials such as silica on the surface of AgNPrs is employed to extend the application of these nanoparticles in biocompatible conditions and to increase the thermal stability. Upon interaction with optical excitations (pulsed laser excitation), AgNPrs undergo light intensity field enhancement (LIFE) at the corners. In the case of a hybrid hetero-structure of AgNPr with silica coating (AgNPr@SiO2), LIFE leads to a nano-structural deformation. In this study, we demonstrate that depending on the intensity of light excitation, medium properties and geometrical sharpness of corners of the prisms, LIFE could induce localized damage or abrasion at the edges of immediate dielectric contact, here silica coating. A theoretical study was conducted to establish the influence of finite radius of curvature (ROC) of corners upon plasmonic interactions to generate a LIFE during appropriate optical excitations. Experiments were performed in AgNPr@SiO2 using nanosecond pulsed laser excitation at 900 nm and electron microscopic analysis of nanostructures revealed a localized edge abrasion of silica at the prism corners. Further to study the effect of direct plasmonic excitation during LIFE, pulsed laser excitation on ultra-thin graphene oxide (GO) wrapped AgNPr@SiO2 (GO-AgNPr@SiO2) was conducted. Due to GO wrapping and subsequent change in light absorption, the extent of LIFE at corners diminishes which leads to structural stability and preserving hetero-structure morphology.

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Publication details

The article was received on 04 May 2017, accepted on 10 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03171H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Light Intensity Field Enhancement (LIFE) Induced Localized Edge Abrasion of Silica-Coated Silver Nanoprisms

    R. Thomas, S. Z. F. Phua, S. Sreejith, Y. Zhao and C. B. Soh, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03171H

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