Molecular Grafting to Silicon Surfaces in Air Using Organic Triazenes as Stable Diazonium Sources and HF as a Constant Hydride-Passivation Source
Molecular Grafting to Silicon Surfaces in Air Using Organic Triazenes as Stable Diazonium Sources and HF as a Constant Hydride-Passivation Source
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DOI：
10.1021/cm051104h
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发表时间：
2005-08
影响因子：
8.6
通讯作者：
Bo Chen;Austen K. Flatt;Huahua Jian;Jared L. Hudson;J. Tour
中科院分区：
文献类型：
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作者：
Bo Chen;Austen K. Flatt;Huahua Jian;Jared L. Hudson;J. Tour
在氢化物钝化的Si(10 0)表面(Si−H)上，用2%HF将芳基二乙基三氮烯原位转化为芳基重氮盐，然后将芳基物种自发地接枝到硅表面，从而实现了芳基分子的共价接枝。主要进展如下：第一，活性重氮物种不需要分离，第二，通过使用氢氟酸作为三氮烯到重氮离子的转化促进剂，整个过程可以在空气中进行，因为任何硅氧化物都可以连续转化为Si−H物种。根据所使用的反应条件，可以形成从单分子层到200纳米厚的分子层。在一种情况下，分子带有α-三氮烯和ω-苯胺(6)，在分子层通过三氮烯接枝到硅−H上后，剩余的苯胺部分在NOBF4的作用下原位转化为重氮盐，然后允许与功能化的单壁碳纳米管(SWNTs)反应，从而通过共价将纳米管连接到硅表面。
Aryl molecules were covalently grafted to hydride-passivated Si(100) surfaces (Si−H) by the in situ conversion of aryldiethyltriazenes into aryldiazonium salts using 2% HF, followed by spontaneous surface grafting of the aryl species to the silicon surface. Major advances are as follows: first, reactive diazonium species need not be isolated, and second, by using aqueous HF as the triazene-to-diazonium conversion promoter, the entire process can be carried out in air since any Si-oxide is continuously converted to the Si−H species. Molecular layers from a monolayer to 200 nm thick could be formed depending on the reaction conditions used. In one case where the molecule bore an α-triazene and ω-aniline (6), after grafting of the molecular layer onto Si−H via the triazene, the remaining aniline moiety was converted into a diazonium salt in situ with NOBF4 and then permitted to react with functionalized single-walled carbon nanotubes (SWNTs), thereby covalently attaching nanotubes to the silicon surface usi...