| Abstract
| - Monolayers attached to a Si(111) surface through Si−C−C or Si−O−C covalent bonds were prepared by thethermally activated reaction (150 °C) of vinylferrocene (VFC) or ferrocenecarboxaldehyde (FCA) molecules withhydrogen-terminated Si(111) substrate in order to compare their reactivities. The resulting monolayers gave a coupleof redox waves on voltammograms due to ferrocenyl moieties tethered at the surface. The voltammetric quantificationrevealed that the growth of electrochemically active layers was terminated within 5 h and the final surface coveragesof the active ferrocenyl moieties were 58% and 16% for VFC- and FCA-based monolayers, respectively, indicatingthat the aldehyde molecule is less reactive. X-ray photoelectron spectroscopy and ellipsometry, however, gave anindication that the growth of the VFC layer did not self-terminate and proceeded beyond a monolayer, while thisovergrown part of the layer was not electrochemically active.
|
