Local Melting of Gold Thin Films by Femtosecond Laser-Interference Processing to Generate Nanoparticles on a Source Target.

Yoshiki Nakata,Tatsuya Shoji,Aiko Narazaki,Yasuyuki Tsuboi,Noriaki Miyanaga,Keiichi Murakawa

doi:10.3390/nano8070477

Yoshiki Nakata, Tatsuya Shoji + Show 4 more

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https://doi.org/10.3390/nano8070477

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Shape- and size-controlled metallic nanoparticles are very important due to their wide applicability. Such particles have been fabricated by chemosynthesis, chemical-vapor deposition, and laser processing. Pulsed-laser deposition and laser-induced dot transfer use ejections of molten layers and solid-liquid-solid processes to fabricate nanoparticles with a radius of some tens to hundreds of nm. In these processes, the nanoparticles are collected on an acceptor substrate. In the present experiment, we used laser-interference processing of gold thin films, which deposited nanoparticles directly on the source thin film with a yield ratio. A typical nanoparticle had roundness and circularity , and the radius was controllable between 69 and 188 nm. The smallest radius was 82 nm on average, and the smallest standard deviation was 3 nm. The simplicity, high yield, and ideal features of the nanoparticles produced by this method will broaden the range of applications of nanoparticles in fields such as plasmonics.

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Shape- and size-controlled metallic nanoparticles have a variety of applications in the fields of plasmonics, catalysts, biology, etc
Such nanoparticles have been fabricated by chemosynthesis [1,2], chemical-vapor deposition [3], electron-beam lithography [4], laser processing, etc
Using the SLS process, we successfully fabricated gold nanoparticles with radii of tens to hundreds of nm and good roundness-which were subsequently deposited on the source substrate-using irradiation through the interference pattern of a fs laser

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Shape- and size-controlled metallic nanoparticles have a variety of applications in the fields of plasmonics, catalysts, biology, etc. Such nanoparticles have been fabricated by chemosynthesis [1,2], chemical-vapor deposition [3], electron-beam lithography [4], laser processing, etc. The laser-interference processing technique has been applied to metallic thin films. Motions of the liquid source metal are induced periodically in space by the interference pattern, and nano-sized structures freeze simultaneously after photon and emission of radiation.

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