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Lookup NU author(s): Professor Yen Nee Tan
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. In this study, a simple method to synthesize right silver bipyramid (AgBP) nanostructures via the seed-mediated growth cum oxidative etching approach in aqueous solution is developed. The key strategy of this method is to control the growth and etching process by careful adjustment of the reactants concentration. Ascorbic acid (AA) is used to reduce silver precursor while cetyltrimethylammonium bromide stabilizer is used to direct the preferential growth of (100) facets. The presence of Cu2+ and AA in the reaction mixture also enable in-situ generation of H2O2, leading to selective etching of (111) facets, which is crucial to the formation of anisotropic AgBPs. The structure-properties of AgBPs is systematically investigated through a series of experiments and theoretical simulations. Transmission electron microscope images and X-ray diffraction patterns of the as-synthesized AgBPs show the formation of single crystalline twined nanostructures with a relatively high yield. These results suggest the important role of the excitation of electric dipole in enhancing the electric field at the six sharp corners of AgBPs, making them especially promising for a wide range of technological applications including surface-enhanced Raman scattering with a significant enhancement factor of 1.50 × 105 as demonstrated herein.
Author(s): Tavakkoli Yaraki M, Daqiqeh Rezaei S, Middha E, Tan YN
Publication type: Article
Publication status: Published
Journal: Particle and Particle Systems Characterization
Year: 2020
Volume: 37
Issue: 5
Print publication date: 01/05/2020
Online publication date: 13/04/2020
Acceptance date: 09/03/2020
Date deposited: 24/05/2021
ISSN (print): 0934-0866
ISSN (electronic): 1521-4117
Publisher: Wiley-VCH Verlag
URL: https://doi.org/10.1002/ppsc.202000027
DOI: 10.1002/ppsc.202000027
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