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Laser-irradiated Inclined Metal Nanocolumns for Selective, Scalable, and Room-temperature Synthesis of Plasmonic Isotropic Nanospheres

Abstract

Plasmonic nanocrystals, which exhibit extraordinary optical properties, are challenging to grow in selective positions with a cost-effective and high-throughput process. We demonstrate that plasmonic isotropic gold nanospheres (AuNSs) can be selectively synthesized on wafer-scale rigid and flexible substrates at room temperature by laser irradiation. First, we prepare a gold nanocolumnar (AuNC) on sapphire and polydimethylsiloxane substrates by glancing angle deposition (GAD). Then, KrF excimer laser is exposed to selected positions with 24 ns pulse duration. Finally, highly isotropic AuNSs as plasmonic nanocrystals are synthesized at the targeted positions. We suggest that the formation of such isotropic AuNSs is caused by reshaping from the top of the AuNC; this is verified by the temperature distribution in the AuNCs during laser irradiation through finite element method simulations. We further investigate the formation of AuNSs by varying the laser energy density and kinds of substrates. By using a simple mask process, we demonstrate patterning of the letters “KIST” via the selectively grown AuNSs on a flexible substrate. The simple laser irradiation process on GAD-grown metal NC thin films is expected to be a promising way for scalable synthesis of plasmonic isotropic NSs at targeted positions at a rapid process and at room temperature.

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Publication details

The article was received on 22 Feb 2018, accepted on 30 Apr 2018 and first published on 30 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC00896E
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Laser-irradiated Inclined Metal Nanocolumns for Selective, Scalable, and Room-temperature Synthesis of Plasmonic Isotropic Nanospheres

    M. Noh, S. D. Han, S. Chae, S. H. Back, S. Kim, S. Baek, S. K. Kim, J. Choi, J. Kim, D. J. Ahn, D. Choi and C. Kang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00896E

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