Two-dimensional Molecular Aggregation Structure and Thermal Molecular Motion of Polyalkylsiloxane Ultrathin Films

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  • KOGA Tomoyuki
    Institute for Materials Chemistry and Engineering (Ito Campus), Kyushu University
  • HONDA Koji
    Institute for Materials Chemistry and Engineering (Ito Campus), Kyushu University
  • SASAKI Sono
    Japan Synchrotron Radiation Research Institute
  • SAKATA Osami
    Japan Synchrotron Radiation Research Institute
  • TAKAHARA Atsushi
    Institute for Materials Chemistry and Engineering (Ito Campus), Kyushu University

Bibliographic Information

Other Title
  • ポリアルキルシロキサン超薄膜の二次元凝集構造と分子運動特性
  • ポリアルキルシロキサン チョウハクマク ノ 2ジゲン ギョウシュウ コウゾウ ト ブンシ ウンドウ トクセイ

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Description

Two-dimensional molecular aggregation states of polyalkylsiloxane ultrathin films on silicon wafer substrates surface were investigated by various techniques. The in-plane grazing incidence X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and scanning force microscopy revealed that the alkyl chains in the octadecyltrimethoxysilane (OTMS) ultrathin films prepared by the CVA method (OTMS-CVA) are in an amorphous state at room temperature. On the other hand, octadecyltrichlorosilane (OTS) ultrathin films prepared by the solution chemisorption method and water-cast method are in a hexagonal crystalline state. According to lateral force microscopic measurements, the transition temperature from the hexagonal crystalline phase to the amorphous phase was found to be ca 333 K for the OTS ultrathin film prepared by the chemisorption method. However, the phase transition was not clearly observed in the OTMS-CVA ultrathin film. These results indicated that organosilane compounds in the ultrathin film prepared by the CVA method were immobilized on the silicon wafer substrate surface in an amorphous state, which was quite different from the hexagonal crystalline state obtained by the solution chemisorption and water-cast methods.<br>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 64 (5), 269-279, 2007

    The Society of Polymer Science, Japan

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