Water and Organic Solvent Dispersible Gold Nanorods that are pH Responsive
Water and Organic Solvent Dispersible Gold Nanorods that are pH Responsive
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DOI：
10.1002/slct.201601248
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发表时间：
2016-10-16
期刊：
影响因子：
2.1
通讯作者：
Kawai, Takeshi
中科院分区：
文献类型：
--
作者：
Imura, Yoshiro;Fukuda, Kunihiro;Kawai, Takeshi
形状控制的金纳米棒是在盖层剂十六烷基三甲基溴化铵（CTAB）的存在下制备的，该盖层剂控制其形态和在水中的分散性。为了控制它们在水和另一种有机溶剂之间的分散性，在金纳米棒上引入了一种ph响应性的两亲化合物C18AA代替CTAB。包覆c18aa的金纳米棒分散在水和氯仿中。这些金纳米棒对pH值的反应取决于观察到的C18AA去质子化的程度：pH值高于9.5的末端胺去质子化增加了纳米棒的疏水性，导致它们在氯仿中比在水中更容易溶解。当pH值为9.0 ~ 12.5时，c18aa包覆的金纳米棒可以从水相转移到有机相。由于C18AA盖层分子的稳定作用，纳米棒的形态不会因为配体交换或相转移而改变。c18aa覆盖的金纳米棒也可以通过蒸发氯仿转移到水相。
Shape-controlled gold nanorods are prepared in the presence of a capping agent, cetyltrimethylammonium bromide (CTAB), which controls their morphology and dispersibility in water. To control their dispersibility between water and another organic solvent, a pH-responsive amphiphile C18AA was introduced on gold nanorods instead of CTAB. The C18AA-capped gold nanorods were dispersed in both water and chloroform. These gold nanorods were pH-responsive depending on the extent of C18AA deprotonation observed: deprotonation of the terminal amine above pH 9.5 increases the hydrophobicity of the nanorods, resulting in them being more soluble in chloroform than in water. C18AA-capped gold nanorods can transfer from the water phase to the organic phase by changing the pH from 9.0 to 12.5. The morphology of the nanorods did not change as a result of ligand-exchange, or phase transfer, due to the stabilizing effect of the C18AA capping molecule. C18AA-capped gold nanorods can also be transferred to the water phase by evaporating the chloroform.