Covalent assembly and micropatterning of functionalized multiwalled carbon nanotubes to monolayer-modified Si(111) surfaces
Covalent assembly and micropatterning of functionalized multiwalled carbon nanotubes to monolayer-modified Si(111) surfaces
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DOI：
10.1021/la800358w
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发表时间：
2008-07-01
期刊：
影响因子：
3.9
通讯作者：
Vaccari, Lisa
中科院分区：
文献类型：
--
作者：
Fabre, Bruno;Hauquier, Fanny;Vaccari, Lisa
通过使用碳二亚胺偶联将可溶性胺官能化 MWNT 连接到预组装的十一烷酸单层上，制备了共价结合到单晶 p 型 Si(I 11) 表面的多壁碳纳米管 (MWNT)。这些功能化表面的 SEM 分析表明，结合的 MWNT 与表面平行而不是垂直。伏安法和电化学阻抗谱测量表明，MWNT 修饰表面的电子转移比在无 MWNT 的烷基单层上观察到的电子转移更快。我们还证明，可以使用这种表面酰胺化反应和“无试剂”紫外光刻技术来制备 MWNT 微图案。采用这种方法，产生了被正十二烷基区域包围的 MWNT 图案，并通过扫描电化学显微镜检查了这些微图案表面的局部电化学特性。特别是，事实证明，MWNT 图案可以实现更快的电荷转移，这与均匀改性表面获得的结果一致。
Multiwalled carbon nanotubes (MWNTs) covalently bound to monocrystalline p-type Si(I 11) surfaces have been prepared by attaching soluble amine-functionalized MWNTs onto a preassembled undecanoic acid monolayer using carbodiimide coupling. SEM analysis of these functionalized surfaces shows that the bound MWNTs are parallel to the surface rather than perpendicular. The voltammetric and electrochemical impedance spectroscopy measurements reveal that the electron transfer at the MWNT-modified surface is faster than that observed at a MWNT-free alkyl monolayer. We have also demonstrated that it is possible to prepare MWNT micropatterns using this surface amidation reaction and a "reagentless" UV photolithography technique. Following this approach, MWNT patterns surrounded by n-dodecyl areas have been produced and the local electrochemical properties of these micropatterned surfaces have been examined by scanning electrochemical microscopy. In particular, it is demonstrated that the MWNT patterns allow a faster charge transfer which is consistent with the results obtained for the uniformly modified surfaces.