Aggregation structure and surface properties of 18-nonadecenyltrichlorosilane monolayer and multilayer films prepared by the Langmuir method

Ken Kojio, Atsushi Takahara, Tisato Kajiyama

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The 18-nonadecyltrichlorosilane (NTS) monolayer with a vinyl end group was prepared by the Langmuir method. The monolayer with a hydrophilic carboxylated surface was subsequently obtained by oxidation of the vinyl end group. For the multilayer preparation, the NTS monolayer was immobilized onto the hydrophilic carboxylated NTS (NTSCOOH) monolayer. The NTS multilayer film was obtained by repetitions of depositions and oxidations. Aggregation structure of the NTS multilayer film was evaluated on the basis of X-ray reflectivity (XR), Brewster angle infrared (IR) spectroscopic measurements, electron diffraction (ED) and atomic force microscopic (AFM) observations. It was revealed that the NTS multilayer film with a well-ordered structure could be prepared by the Langmuir method. The local height control was performed by utilizing the phase-separated mixed monolayer being composed of the NTS and [2-(perfluorooctyl)ethyl]trichlorosilane (FOETS) molecule. The (NTS/FOETS) mixed monolayer showed phase-separated structure like sea-island, whose domain and matrix phases were composed of crystalline NTS and amorphous FOETS molecules, respectively. The (NTSCooH/FOETS) mixed monolayer with the hydrophilic domain and the hydrophobic matrix was obtained by selective oxidization of the NTS phase in the (NTS/FOETS) mixed monolayer. Furthermore, the local height control on the NTSCOOH phase of the (NTSCOOH/FOETS) mixed monolayer was performed by chemisorption of NTS from the solution. The height increase in the NTSCOOH phase was confirmed by AFM and lateral force microscopy (LFM).

Original languageEnglish
Pages (from-to)332-352
Number of pages21
JournalACS Symposium Series
Volume729
Publication statusPublished - Dec 1 1999

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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