Facile Preparation of Hierarchical Structures Using Crystallization-Kinetics Driven Self-Assembly
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- Jinguang Cai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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- Chao Lv
- China Academy of Engineering Physics, P.O. Box 919-71, Mianyang 621900, Sichuan, People’s Republic of China
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- Akira Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
書誌事項
- 公開日
- 2015-08-14
- 資源種別
- journal article
- DOI
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- 10.1021/acsami.5b05177
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
Hierarchical structures (HSs) constructed by nanoparticle-based building blocks possess not only the properties of the primary building blocks but also collective properties of the assemblies. Here we report the facile preparation of hierarchical Ag nanoparticles/polyhedral oligomeric silsequioxane molecule (POSS) hybrid branched structures within tens of seconds by using spin-coating and doctor-blade methods. An assembly mechanism mainly controlled by POSS-crystallization kinetics and space resistance of Ag nanoparticles toward the diffusion of POSS molecules was tentatively proposed. It was demonstrated as a universal method for the preparation of hierarchical hybrid branched structures on arbitrary substrates, as well as by using other different POSS and inorganic nanoparticles. As a demonstration, Ag hierarchical structures obtained by heat treatment exhibit excellent SERS performance with enhancement factors as high as on the order of 10(7), making them promising sensors for the detection of trace amount of analyte adsorbed on the surface. Two-dimensional SERS mapping was also demonstrated by using a direct imaging system with high mapping speed and high resolution. Moreover, the substrates with Ag hierarchical structures were used as a SERS sensor for in situ detection due to the excellent SERS performance and stability of the structures.
収録刊行物
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- ACS Applied Materials & Interfaces
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ACS Applied Materials & Interfaces 7 (33), 18697-18706, 2015-08-14
American Chemical Society (ACS)