Rapid synthesis of monodispersed Au-Ag alloy nanosponges using selective laser melting and dealloying for sensitive near-infrared surface-enhanced Raman scattering

Wen Hua; Hang Lifeng; Liang LianbaoLi WumingJiang Guihua

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Rapid synthesis of monodispersed Au-Ag alloy nanosponges using selective laser melting and dealloying for sensitive near-infrared surface-enhanced Raman scattering

机译：Rapid synthesis of monodispersed Au-Ag alloy nanosponges using selective laser melting and dealloying for sensitive near-infrared surface-enhanced Raman scattering

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摘要

We developed a rapid synthesis method for monodispersed Au-Ag alloy nanosponges (NSs) with high density of 'hotspots' for near-infrared surface enhanced Raman scattering (NIR-SERS) by a selective laser-irradiation melting and chemical dealloying process. Au@Ag core-shell nanocubes were first in situ converted into solid alloyed Au-Ag nanospheres by a rapid laser irradiation igniting quick fusion and quenching process within two minutes. The alloyed Au-Ag nanospheres transformed into Au-Ag alloy NSs after treated by a chemical dealloying process. Different from traditional thermal annealing, it thus can effectively avoid the heat fusion between nanoparticles, and maintain the alloyed Au-Ag nanospheres and NSs in high monodispersity. Importantly, due to the strong plasmonic coupling in nanopores (pore size less than 10 nm), the obtained Au-Ag alloy NSs show a broad and intense localized surface plasmon resonances absorption ranging from visible to near-Infrared region (500-1200 nm). The accessibly open structures for absorbing targets and high-density of 'NIR-hotspots' endow the Au-Ag alloy NSs substrate with superior sensitivity in NIR-SERS detection of 4-aminothiophenol with an enhancement factor of similar to 10(7). This work not only provides a simple pathway for rapid preparation of NIR-SERS substrate for biosensing, but also might open up a new horizon for fabricating spongy nanostructures with other elements.

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来源
《Nanotechnology》 |2022年第2期|共7页
作者
Wen Hua; Hang Lifeng; Liang LianbaoLi WumingJiang Guihua;
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作者单位

Guangdong Second Prov Gen Hosp;

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原文格式 PDF
正文语种英语
中图分类特种结构材料;
关键词
rapid synthesis; monodispersed; Au-Ag alloy nanosponges; hotspots; near-infrared surface enhanced Raman scattering; GOLD NANOPARTICLES; SPHERICAL-PARTICLES; PLASMON RESONANCES; HIGH-DENSITY; SERS; NIR; SIZE; IRRADIATION; NANORODS; NANOSPHERES;

Rapid synthesis of monodispersed Au-Ag alloy nanosponges using selective laser melting and dealloying for sensitive near-infrared surface-enhanced Raman scattering

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