Electrostatic interactions for directed assembly of nanostructured materials: composites of titanium dioxide nanotubes with gold nanoparticles
Electrostatic interactions for directed assembly of nanostructured materials: composites of titanium dioxide nanotubes with gold nanoparticles
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纳米结构材料定向组装的静电相互作用：二氧化钛纳米管与金纳米颗粒的复合材料
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Khlobystov
中科院分区：
文献类型：
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作者：
Jingxian Yu;G. Rance;A. Khlobystov
二氧化钛纳米管（TiO 2NTs）与正（AuNP+s）和负（AuNP−s）金纳米粒子的相互作用已经使用紫外可见光谱，紫外线电位和透射电子显微镜分析的组合进行了研究。具有带负电荷的表面，TiO 2 NTs与AuNP−s没有吸引力的相互作用，但很容易与AuNP+s形成纳米结构的复合材料。使用不同比例的TiO 2NT：AuNP+，纳米管-纳米颗粒复合物的总电荷可以从正通过中性到负进行调整，这极大地影响了所得材料在水中的溶解度。纳米复合物的电荷与AuNP+s在TiO 2 NTs表面的吸附密度有关。在较高的密度吸附的纳米粒子相互作用，并表现出其表面等离子体共振的红移，其幅度与AuNP+s的密度增加。这种方法能够精确控制纳米管-纳米颗粒材料的组成、电荷和结构。
Interactions of titanium dioxide nanotubes (TiO2NTs) with positively (AuNP+s) and negatively charged (AuNP−s) gold nanoparticles have been investigated using a combination of UV-Vis spectroscopy, ζ potential and transmission electron microscopy analyses. Possessing a negatively charged surface, TiO2NTs show no attractive interactions with AuNP−s, but readily form nanostructured composites with AuNP+s. Using different ratios of TiO2NT : AuNP+, the overall charge of nanotube–nanoparticle composite can be tuned from positive through neutral to negative, which drastically affects the solubility of the resultant material in water. The charge of the nano-composite is related to the density of AuNP+s adsorbed on the surface of the TiO2NTs. At higher densities adsorbed nanoparticles interact with each other and exhibit a red-shift of their surface plasmon resonance, the magnitude of which increases with the density of AuNP+s. This methodology enables precise control over the composition, charge and structure of nanotube–nanoparticle materials.