Immobilization of Gold Nanoparticles on Aluminum Oxide Nanoporous Structure for Highly Sensitive Plasmonic Sensing
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概要
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In this work, we investigate the optical properties of a nanostructure design with plasmonic gold nanoparticles (AuNPs) and photonic thin-film multilayers of aluminum oxide on an aluminum film. An aluminum oxide nanoporous surface fabricated by the two-step anodizing method is treated with cationic poly(allyl amine) to fix AuNPs on the surface. The porous nanostructure partially trapped two nanoparticles, producing a small number of nanoparticle dimers on the substrate surface. The experimental and simulation results show that the plasmonic spectra of these gold nanoparticle dimers (AuNDs) are enhanced by the interference spectra of the Al2O3/Al multilayer. On the basis of the longitudinal localized surface plasmon resonance (LSPR) band of AuNDs, our nanostructure substrate showed a high sensitivity to various solutions with different refractive indices, thus showing promising potential for the to development of a new nanosensor for the label-free monitoring of biomolecular interactions.
- 2010-06-25
著者
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Yoshikawa Hiroyuki
Department Of Applied Physics And Handai Frontier Research Center Osaka University
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Le Quynh
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Hiep Ha
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Taniyama Shunichi
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Kenji Kondoh
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Masato Saito
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Eiichi Tamiya
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Ha Minh
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Shunichi Taniyama
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Hiroyuki Yoshikawa
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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