Departamento de Quimica Organica, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
ACS Nano. 2010 Feb 23;4(2):905-12. doi: 10.1021/nn901729d.
In this paper, we report the functionalization of the surface of multiwalled carbon nanotubes (MWNTs) with Au dendrimer encapsulated nanoparticles (DENs). The results show that, when pristine MWNTs having hydrophobic surfaces are exposed to DENs, the dendrimers aggregate on the MWNT surface. However, when the MWNTs are oxidized in acid prior to exposure to DENs, well-dispersed submonolayer coverages of Au nanoparticles are observed on the MWNT surface. This suggests that acid-induced debundling of the nanotubes is an essential prerequisite for attachment of nearly monodisperse DENs. Electron microscopy and NMR spectroscopy confirm that the structures of the DENs and dendrimers are retained after immobilization on the surface of acid-functionalized MWNTs.
在本文中，我们报告了通过金树枝状大分子包裹的纳米粒子（DENs）对多壁碳纳米管（MWNTs）表面进行功能化。结果表明，当具有疏水性表面的原始 MWNTs 暴露于 DENs 时，树枝状大分子会在 MWNT 表面聚集。然而，当 MWNTs 在暴露于 DENs 之前在酸中氧化时，在 MWNT 表面观察到金纳米粒子的良好分散亚单层覆盖。这表明酸诱导的纳米管去缠结是几乎单分散 DENs 附着的必要前提。电子显微镜和 NMR 光谱证实，DENs 和树枝状大分子的结构在固定在酸功能化的 MWNTs 表面后得以保留。
