Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping

Kamalesh Chaudhari; Tripti Ahuja; Vasanthanarayan Murugesan; Vidhya Subramanian; Mohd Azhardin Ganayee; Thomas Thundat; Thalappil Pradeep

doi:10.1039/C8NR06497K

Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping†

Kamalesh Chaudhari,‡^a Tripti Ahuja,‡^a Vasanthanarayan Murugesan,^a Vidhya Subramanian,^a Mohd Azhardin Ganayee,^a Thomas Thundat

*^b and Thalappil Pradeep

*^a

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* Corresponding authors

^a DST Unit of NanoScience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
E-mail: pradeep@iitm.ac.in
Tel: +91044 -2257-4208

^b Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada
E-mail: thundat@ualberta.ca

Abstract

We report simultaneous plasmonic scattering and Raman spectroscopic observations of single citrate capped silver nanoparticles (AgNPs) which exhibit surface enhanced Raman scattering (SERS) upon meeting specific conditions induced by laser (532 nm) exposure. We show that nanoparticles which are not initially SERS active become SERS active by laser-induced reshaping/reorientation. A set-up developed for these observations enabled in situ high speed time-lapse characterization using plasmonic and Raman spectroscopies in conjunction with dark-field microscopy (DFM). Changes in the AgNPs were confirmed by monitoring plasmonic scattering spectra and DFM images. Time-lapse observations have shown that laser-induced changes in the plasmonic properties of AgNPs resulted in the appearance of SERS. Spectral matching between plasmon resonance and downward molecular vibronic transitions for molecules adsorbed on the surface of plasmonic nanomaterials is attributed to the nanoparticle SERS. We have further shown that the release of silver ions by silver nanoparticles can be the probable reason for their plasmonic changes. Gold nanoparticles inert to such mild (850 μW, 532 nm) laser-induced changes do not exhibit the appearance of SERS.

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DOI: https://doi.org/10.1039/C8NR06497K
Article type: Paper
Submitted: 12 Aug 2018
Accepted: 14 Nov 2018
First published: 16 Nov 2018

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Nanoscale, 2019,11, 321-330

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Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping

K. Chaudhari, T. Ahuja, V. Murugesan, V. Subramanian, M. A. Ganayee, T. Thundat and T. Pradeep, Nanoscale, 2019, 11, 321 DOI: 10.1039/C8NR06497K

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Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping†

Abstract

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Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping

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