Scanning force microscopic study of surface structure and properties of (alkylsilane/fluoroalkylsilane) mixed monolayers

Tisato Kajiyama, Shouren Ge, Ken Kojio, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

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(Alkylsilane/fluoroalkylsilane) mixed monolayers were immobilized covalently on a silicon wafer surface with stable surface structure. Atomic force microscopic observation of the n-octadecyltrichlorosilane(OTS)/[2-(perfluorooctyl)ethyl]trichlorosila ne (FOETS) mixed monolayer revealed that the crystalline OTS circular domains of ca. 1-2 μm in diameter were surrounded by a sea-like amorphous FOETS matrix, even though the molar fraction of OTS was above 75%. Also, the phase-separated monolayer can be prepared from FOETS, and a non-polymerizable and crystallizable amphiphile such as lignoceric acid (LA). The phase separation of the (alkylsilane/fluoroalkylsilane) mixed monolayer might be attributed to both faster spreading of FOETS molecules on the water surface and the crystallizable characteristics of alkylsilane molecules. The mixed monolayer of crystalline alkylsilane (OTS) and amorphous alkylsilane (n-dodecyltrichlorosilane, DDTS) formed a phase-separated structure on the water surface because of the crystallizable characteristics of OTS. Lateral force microscopic (LFM) observation revealed that the order of the magnitude of lateral force generated against the silicon nitride tip was: n-triacontyltrichlorosilane (TATS) domain with longer alkyl chain>amorphous FOETS matrix>crystalline OTS domain. On the other hand, scanning viscoelasticity microscopic observation revealed that the order of the magnitude of modulus was: Si substrate>crystalline OTS domain>amorphous FOETS matrix.

元の言語英語
ページ(範囲)123-130
ページ数8
ジャーナルSupramolecular Science
3
発行部数1-3
DOI
出版物ステータス出版済み - 1 1 1996

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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