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Volumn 102, Issue 37, 1998, Pages 7190-7197

Formation of self-assembled octadecylsiloxane monolayers on mica and silicon surfaces studied by atomic force microscopy and infrared spectroscopy

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EID: 0000622679     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp981282g     Document Type: Article
Times cited : (164)

References (42)
  • 2
    • 0345979435 scopus 로고    scopus 로고
    • Ulman, A. Chem. Rev. 1996, 96, 1533-1554.
    • (1996) Chem. Rev. , vol.96 , pp. 1533-1554
    • Ulman, A.1
  • 32
    • 11644294692 scopus 로고    scopus 로고
    • note
    • Although the refractive index of the adsorbate film is certainly a function of coverage, it is not directly determinable for submonolayer films and is, therefore, commonly assumed to be constant and equal to the value of a full monolayer, which means that any changes in the ellipsometric angles Δ and Ψ are interpreted as changes in film thickness. The error introduced by this assumption has been shown (see ref 7) to be small (<1 Å) for hydrocarbon films undergoing a transition from a liquidlike structure (n ≈ 1.43) at low coverage to a crystalline, densely packed structure (n ≈ 1.50) at high coverage (continuous film growth). For an island-type growth mechanism, on the other hand, the (macroscopic) film refractive index is expected to change more drastically between n = 1 (uncovered surface in contact with air) and 1.50 (full monolayer), see ref 22. Whereas the true film thickness (i.e., the height of the islands) is independent of coverage in this case, the ellipsometrically measured values for an assumed constant refractive index represent the weighted average of covered and uncovered surface regions and, therefore, reflect the changes in film density rather than changes in film thickness.
  • 36
    • 11644252905 scopus 로고    scopus 로고
    • note
    • Strictly speaking, muscovite mica has biaxial optical properties due to its monoclinic crystal structure and is characterized by three different refractive indices along three mutually perpendicular optical axes. For a certain sample configuration, however, with p-polarized light incident at the Brewster angle, mica exhibits pseudoisotropic optical properties described by a single refractive index, see ref 34.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.