Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto, Japan.
J Colloid Interface Sci. 2011 Sep 1;361(1):259-69. doi: 10.1016/j.jcis.2011.05.071. Epub 2011 Jun 2.
Electrochemically active self-assembled monolayers (SAM) have been successfully fabricated with atomic-scale uniformity on a silicon (Si)(111) surface by immobilizing vinylferrocene (VFC) molecules through Si-C covalent bonds. The reaction of VFC with the hydrogen-terminated Si (H-Si)(111) surface was photochemically promoted by irradiation of visible light on a H-Si(111) substrate immersed in n-decane solution of VFC. We found that aggregation and polymerization of VFC was avoided when n-decane was used as a solvent. Voltammetric quantification revealed that the surface density of ferrocenyl groups was 1.4×10(-10) mol cm(-2), i.e., 11% in substitution rate of Si-H bond. VFC-SAMs were then formed by the optimized preparation method on n-type and p-type Si wafers. VFC-SAM on n-type Si showed positive photo-responsivity, while VFC-SAM on p-type Si showed negative photo-responsivity.
电化学活性自组装单层（SAM）通过通过 Si-C 共价键将乙烯基二茂铁（VFC）分子固定在硅（Si）（111）表面上，成功地以原子级均匀性制备。VFC 与氢终止的 Si（H-Si）（111）表面的反应通过将 H-Si（111）基底浸入 VFC 的正十一烷溶液中并照射可见光来光化学促进。我们发现，当使用正十一烷作为溶剂时，VFC 避免了聚集和聚合。通过伏安定量法发现，二茂铁基的表面密度为 1.4×10(-10) mol cm(-2)，即 Si-H 键的取代率为 11%。然后通过优化的制备方法在 n 型和 p 型 Si 晶片上形成 VFC-SAM。n 型 Si 上的 VFC-SAM 表现出正光响应性，而 p 型 Si 上的 VFC-SAM 表现出负光响应性。
