Organically modified silicas on metal nanowires.
Organically modified silicas on metal nanowires.
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DOI：
10.1021/la102070c
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发表时间：
2010-09-21
期刊：
影响因子：
--
通讯作者：
Keating CD
中科院分区：
文献类型：
--
作者：
Dean SL;Stapleton JJ;Keating CD
使用具有不同官能团（即，羧基、聚环氧乙烷、氰基、二氢咪唑和己基连接基）。通过硅醇盐的水解和缩聚反应，在长6 μ m、宽300 nm的圆柱形金属纳米线表面悬浮沉积了有机改性二氧化硅。合成进行了几个比例的四乙氧基硅烷的有机改性的硅醇盐，将所需的官能团到薄的有机硅壳上的纳米线。这些涂层的特征在于使用透射电子显微镜，X射线光电子能谱，和红外光谱。这里制备的所有有机改性的二氧化硅都是足够多孔的，以允许通过酸蚀刻去除金属纳米线芯以形成有机改性的二氧化硅纳米管。与仅使用四乙氧基硅烷前体制备的未改性二氧化硅相比，向改性二氧化硅提供的额外功能性通过在含咪唑的二氧化硅上的铬酸盐吸附和在含聚环氧乙烷的二氧化硅上对蛋白质吸附的抗性来证明。纳米线和其他纳米和微米颗粒上的有机改性的二氧化硅涂层由于二氧化硅涂层的增强的性质（例如，防止生物污垢）而在诸如生物传感或纳米级治疗学的领域中具有潜在的应用。
Organically modified silica coatings were prepared on metal nanowires using a variety of silicon alkoxides with different functional groups (i.e., carboxyl groups, polyethylene oxide, cyano, dihydroimidazole, and hexyl linkers). Organically modified silicas were deposited onto the surface of 6-μm-long, ∼300-nm-wide, cylindrical metal nanowires in suspension by the hydrolysis and polycondensation of silicon alkoxides. Syntheses were performed at several ratios of tetraethoxysilane to an organically modified silicon alkoxide to incorporate desired functional groups into thin organosilica shells on the nanowires. These coatings were characterized using transmission electron microscopy, X-ray photoelectron spectroscopy, and infrared spectroscopy. All of the organically modified silicas prepared here were sufficiently porous to allow the removal of the metal nanowire cores by acid etching to form organically modified silica nanotubes. Additional functionality provided to the modified silicas as compared to unmodified silica prepared using only tetraethoxysilane precursors was demonstrated by chromate adsorption on imidazole-containing silicas and resistance to protein adsorption on polyethyleneoxide-containing silicas. Organically modified silica coatings on nanowires and other nano- and microparticles have potential application in fields such as biosensing or nanoscale therapeutics due to the enhanced properties of the silica coatings, for example, the prevention of biofouling.
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影响因子：
3.9
作者：
Graf, C;Vossen, DLJ;van Blaaderen, A
通讯作者：
van Blaaderen, A
影响因子：
3.9
作者：
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影响因子：
3.5
作者：
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影响因子：
3.2
作者：
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通讯作者：
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影响因子：
2.7
作者：
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通讯作者：
MOSKOVITS, M