Beijing National Laboratory for Molecular Sciences, College of Chemistry, Peking University, Beijing 100871, People's Republic of China.
Langmuir. 2010 May 18;26(10):7582-9. doi: 10.1021/la904393n.
Controlled synthesis of well-defined planar Au nanodendrites with a symmetric single-crystalline structure consisting of trunks and side branches grown along the 211 directions was realized by reducing chloroauric acid in aqueous mixed solutions of dodecyltrimethylammonium bromide (DTAB) and beta-cyclodextrin (beta-CD). It has been revealed that the formation of the supramolecular complexes of DTAB with beta-CD due to host-guest interaction is indispensable for the fabrication of these unique planar Au nanodendrites, and a proper CD-to-DTAB molar ratio is essential to their exclusive formation. A variety of Au nanostructures, such as branched particles consisting of rodlike branches and flowerlike particles consisting of platelike petals, could be readily obtained by simply changing the CD-to-DTAB molar ratio. Moreover, the obtained Au nanodendrites exhibited both a good electrocatalytic activity toward the oxidation of methanol and a good surface-enhanced Raman scattering (SERS) sensitivity for detecting p-aminothiophenol (PATP) molecules, indicating their potential applications including catalysis, biosensing, and nanodevices.
通过在十二烷基三甲基溴化铵（DTAB）和β-环糊精（β-CD）混合水溶液中还原氯金酸，实现了具有由沿 211 方向生长的主干和侧枝组成的对称单晶结构的高度规则的平面金纳米枝晶的可控合成。已经揭示，由于主客体相互作用形成的 DTAB 与β-CD 的超分子配合物对于制造这些独特的平面金纳米枝晶是必不可少的，并且适当的 CD-DTAB 摩尔比对于它们的独特形成是必不可少的。通过简单地改变 CD-DTAB 摩尔比，可以很容易地获得各种金纳米结构，例如由棒状分支组成的分支颗粒和由片状花瓣组成的花状颗粒。此外，所获得的金纳米枝晶对甲醇氧化表现出良好的电催化活性，并且对检测对氨基苯硫酚（PATP）分子具有良好的表面增强拉曼散射（SERS）灵敏度，表明其在催化、生物传感和纳米器件等方面的潜在应用。
