Nanopatterning of alkynes on hydrogen-terminated silicon surfaces by scanning probe-induced cathodic electrografting.
Nanopatterning of alkynes on hydrogen-terminated silicon surfaces by scanning probe-induced cathodic electrografting.
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DOI：
10.1021/ja035857l
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发表时间：
2003-08
影响因子：
15
通讯作者：
P. Hurley;A. Ribbe;J. Buriak
中科院分区：
文献类型：
--
作者：
P. Hurley;A. Ribbe;J. Buriak
先前在体硅表面上证明的电化学阴极电接枝反应可以利用导电探针原子力显微镜（CP-AFM）在纳米尺度上进行图案化。炔电接枝是一种特别有用的化学技术，因为它导致共轭炔与硅的直接共价连接。此外，在反应期间施加正向偏压使得表面对氧化不太敏感，并且所得单层在空气和碱性水溶液中非常稳定。炔单层线可以绘制到40 nm的分辨率，使用Pt涂层的AFM针尖，和单分子层的规模与炔的分子长度的高度。尖端被偏置（+）并且表面被偏置（-）以在环境条件下驱动阴极电接枝反应。单分子膜的耐氟性，以及摩擦力显微镜，表明炔共价键合到表面，而不是氧化物为基础的，和疏水性。该反应对烯烃不起作用，因此氢化硅烷化不是主要的反应模式。更宽的线（300 nm）可以使用加宽的Pt涂层AFM针尖。该反应对于以空间受控的方式将共轭分子直接与硅接合可能是重要的。
The electrochemical cathodic electrografting reaction, previously demonstrated on bulk silicon surfaces, can be patterned on the nanoscale utilizing conducting probe atomic force microscopy (CP-AFM). Alkyne electrografting is a particularly useful chemical technique since it leads to direct covalent attachment of conjugated alkynes to silicon. In addition, application of a forward bias during the reaction renders the surface less sensitive to oxidation and the resulting monolayers are very stable in air and basic aqueous solution. Alkyne monolayer lines can be drawn down to 40 nm resolution using a Pt-coated AFM tip, and the heights of the monolayers scale with the molecular length of the alkyne. The tip is biased (+) and the surface is biased (-) to drive the cathodic electrografting reaction under ambient conditions. The resistance of the monolayers to fluoride, as well as friction force microscopy, indicate that the alkynes are covalently bonded to the surface, not oxide-based, and hydrophobic. The reaction does not work with alkenes, and therefore hydrosilylation is not the primary mode of reaction. Wider lines (300 nm) can be produced using broadened Pt-coated AFM tips. This reaction could be important for the interfacing of conjugated molecules directly to silicon in a spatially controlled fashion.