A versatile platform of catechol-functionalized polysiloxanes for hybrid nanoassembly and in situ surface enhanced Raman scattering applications
A versatile platform of catechol-functionalized polysiloxanes for hybrid nanoassembly and in situ surface enhanced Raman scattering applications
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DOI：
10.1039/c6tc02963a
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发表时间：
2016-09
影响因子：
6.4
通讯作者：
Yida Liu;A. Demirci;Huie Zhu;Jinguang Cai;Shunsuke Yamamoto;A. Watanabe;T. Miyashita;M. Mitsuishi
中科院分区：
文献类型：
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作者：
Yida Liu;A. Demirci;Huie Zhu;Jinguang Cai;Shunsuke Yamamoto;A. Watanabe;T. Miyashita;M. Mitsuishi
受海洋贻贝在水环境中粘附策略的启发，合成了儿茶酚功能化聚硅氧烷（CFPS）。表面粗糙度为4.6 nm (50 μm × 50 μm)，在各种有机和无机基底上均表现出良好的成膜能力。银纳米粒子（AgNPs）被固定在cfps修饰的基片上，使用浸涂工艺。扫描电镜图像显示AgNPs均匀分布在许多衬底上。此外，通过控制AgNP分散体的浓度，可以很容易地调节AgNP的表面数密度和平均间距。具有高密度AgNPs的衬底具有优异的表面增强拉曼散射（SERS）性能，增强因子高达7.89 × 107，检测限为10−10 M，这可归因于cfps诱导自组装控制的相邻AgNPs之间形成的“热点”。使用CFPS修饰的不同衬底上制备的AgNP结构显示出相似的高强度，表明CFPS薄膜为AgNP组件提供了一个多功能平台。此外，由于CFPS的高表面密度儿茶酚单元提供了强大的氢键相互作用，AgNPs在衬底上锚定非常稳定，这使得衬底具有实际应用前景的SERS传感器。原位SERS检测也证明了苹果皮没有破坏AgNP结构。
Inspired by the marine mussel strategy of adhesion in aqueous environments, catechol-functionalized polysiloxane (CFPS) was synthesized. Facile dip-coating showed good film forming ability on various organic and inorganic substrates with a surface roughness of 4.6 nm (50 μm × 50 μm). Silver nanoparticles (AgNPs) are anchored onto CFPS-modified substrates using a dip coating process. The scanning electron microscopy images revealed that AgNPs were distributed homogeneously on numerous substrates. Moreover, the surface number density and average interspace of the AgNPs were tuned easily by controlling the concentration of AgNP dispersions. A substrate with high-density AgNPs exhibited excellent surface enhanced Raman scattering (SERS) performance with an enhancement factor as high as 7.89 × 107 and an ultra-low detection limitation of 10−10 M, which can be ascribed to the “hotspots” formed between the adjacent AgNPs controlled by CFPS-induced self-assembly. The AgNP structures prepared on different substrates modified using CFPS show a similar high intensity, suggesting a versatile platform of the CFPS film for AgNP assemblies. In addition, AgNPs were anchored to be extremely stable on substrates because of strong hydrogen bonding interactions provided by the high surface-density catechol units of CFPS, which made the substrate a promising SERS sensor for practical applications. In situ SERS detection was also demonstrated on apple peel with no damage to AgNP structures.