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首页> 外文期刊>Chemistry: A European journal >Novel ascorbic acid based ionic liquids for the in situ synthesis of quasi-spherical and anisotropic gold nanostructures in aqueous medium
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Novel ascorbic acid based ionic liquids for the in situ synthesis of quasi-spherical and anisotropic gold nanostructures in aqueous medium

机译：新型抗坏血酸基离子液体，用于在水性介质中原位合成准球形和各向异性金纳米结构

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A series of newly designed ascorbic acid based room temperature ionic liquids were successfully used to prepare quasi-spherical and anisotropic gold nanostructures in an aqueous medium at ambient temperature. The synthesis of these room temperature ionic liquids involves, first, the preparation of a 1-alkyl (such as methyl, ethyl, butyl, hexyl, octyl, and decyl) derivative of 3-methylimidazolium hydroxide followed by the neutralization of the derivatised product with ascorbic acid. These ionic liquids show significantly better thermal stability and their glass transition temperature (T-g) decreases with increasing alkyl chain length. The ascorbate counter anion of these ionic liquids acts as a reducing agent for HAuCl4 to produce metallic gold and the alkylated imidazolium counter cation acts as a capping/shape-directing agent. It has been found that the nature of the ionic liquids and the mole ratio of ionic liquid to HAuCl4 has a significant effect on the morphology of the formed gold nanostructures. If an equimolar mixture of ionic liquid and HAuCl4 is used, predominantly anisotropic gold nanostructures are formed and by varying the alkyl chain length attached to imidazolium cation of the ionic liquids, various particle morphologies can formed, such as quasi-spherical, raspberry-like, flakes or dendritic. A probable formation mechanism for such anisotropic gold nanostructures has been proposed, which is based on the results of some control experiments.
机译：一系列新设计的基于抗坏血酸的室温离子液体已成功用于在室温下在水性介质中制备准球形和各向异性金纳米结构。这些室温离子液体的合成首先涉及到3-甲基咪唑鎓氢氧化物的1-烷基（例如甲基，乙基，丁基，己基，辛基和癸基）衍生物的制备，然后用抗坏血酸。这些离子液体显示出明显更好的热稳定性，并且它们的玻璃化转变温度（T-g）随着烷基链长度的增加而降低。这些离子液体的抗坏血酸抗衡阴离子充当HAuCl4产生金属金的还原剂，而烷基化的咪唑鎓抗衡阳离子充当封盖/形状导向剂。已经发现，离子液体的性质和离子液体与HAuCl 4的摩尔比对所形成的金纳米结构的形态具有显着影响。如果使用离子液体和HAuCl4的等摩尔混合物，则主要形成各向异性的金纳米结构，并且通过改变离子液体的咪唑阳离子上附着的烷基链长，可以形成各种颗粒形态，例如准球形，覆盆子形，片状或树枝状。基于一些控制实验的结果，提出了一种各向异性金纳米结构的可能形成机理。

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