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Open AccessArticle

Controlling the Growth Locations of Ag Nanoparticles at Nanoscale by Shifting LSPR Hotspots

1
Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, College of Physics, Jilin Normal University, Changchun 130103, China
2
School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China
3
College of Chemistry, Jilin Normal University, Siping 136000, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1553; https://doi.org/10.3390/nano9111553
Received: 20 September 2019 / Revised: 25 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019
Controlling chemical reactions by plasma is expected to be a new method for improving the structural properties of substrates. An Au nanojar array was prepared when Au was deposited onto a 2D polystyrene (PS) array. The site-selective chemical growth of Ag nanoparticle rings was realized around the Au nanojar necks by a local surface plasmon resonance (LSPR)-assisted chemical reaction. The catalytic hotspots in the nanostructure array could be controlled by both etching the nanojars and Au or TiO2 sputtering onto the nanojars, which were confirmed by the growth sites of the Ag nanoparticle in the LSPR-assisted chemical reaction. The structure of the nanojars and the electric field distributions of the growing nanoparticles were simulated and analyzed using Finite-Difference Time-Domain. FDTD simulations showed that the changes in the nanojar shape led to the changed hotspot distributions. At the same time, tracking the hotspot shifts in the process of structural change was also achieved by the observation of Ag growth. Nanoarray structure prepared by LSPR-assisted chemical reaction is one of the hot fields in current research and is also of great significance for the application of Surface-Enhanced Raman Scattering. View Full-Text
Keywords: site-selective chemical growth; LSPR-assisted chemical reaction; catalytic hotspots; hotspots shift site-selective chemical growth; LSPR-assisted chemical reaction; catalytic hotspots; hotspots shift
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MDPI and ACS Style

Zhu, Q.; Zhang, X.; Wang, Y.; Zhu, A.; Gao, R.; Zhao, X.; Zhang, Y.; Chen, L. Controlling the Growth Locations of Ag Nanoparticles at Nanoscale by Shifting LSPR Hotspots. Nanomaterials 2019, 9, 1553.

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