Spatially-directed oxidation of gold nanoparticles by Au(III)-CTAB complexes
Spatially-directed oxidation of gold nanoparticles by Au(III)-CTAB complexes
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DOI：
10.1021/jp052516g
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发表时间：
2005-08-04
影响因子：
3.3
通讯作者：
Liz-Marzán, LM
中科院分区：
文献类型：
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作者：
Rodríguez-Fernández, J;Pérez-Juste, J;Liz-Marzán, LM
金纳米颗粒在十六烷基三甲基溴化铵（CTAB）存在下容易被Au（III）氧化。氧化优先发生在曲率较高的表面部位。相反，在没有CTAB的情况下，用氰化物离子氧化会导致整个表面均匀氧化。空间定向氧化的例子提供了使用大的，不规则的球体，纳米立方体和纳米棒。我们得出结论，氧化机制取决于氧化剂是否附着在CTAB胶束上。假设CTAB胶束在末端优先接近窄颗粒，导致空间定向氧化。
Gold nanoparticles are readily oxidized by Au(III) in the presence of cetyl-trimethylammonium bromide (CTAB). Oxidation occurs preferentially at surface sites with higher curvature. Conversely, oxidation with cyanide ions in the absence of CTAB leads to uniform oxidation over the whole surface. Examples of the spatially directed oxidation are provided using large, irregular spheres, nanocubes, and nanorods. We conclude that the mechanism of oxidation depends on whether the oxidant is attached to CTAB micelles. It is postulated that the CTAB micelles approach the narroparticles preferentially at the tips, leading to spatially directed oxidation.