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Volumn 13, Issue 19, 1997, Pages 5089-5106

Monolayer damage in XPS measurements as evaluated by independent methods

Author keywords

[No Author keywords available]

Indexed keywords

ANGLE MEASUREMENT; ATOMIC FORCE MICROSCOPY; CARBOXYLIC ACIDS; CONTACT ANGLE; FOURIER TRANSFORM INFRARED SPECTROSCOPY; PARAFFINS; RADIATION DAMAGE; SILANES; SUBSTRATES; SURFACE STRUCTURE; ULTRATHIN FILMS; X RAY PHOTOELECTRON SPECTROSCOPY;

EID: 0031233143     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la962058q     Document Type: Article
Times cited : (165)

References (64)
  • 41
    • 5344223930 scopus 로고    scopus 로고
    • note
    • Values of 200-300 W for the X-ray source power, operated at source-sample distances smaller than that used in the present study, are common. See for example refs 5, 7, 9, 10, 17, 20, 21, 24, 25, and 29.
  • 42
    • 2842607626 scopus 로고
    • Ulman, A., Ed.; Academic: San Diego
    • Maoz, R.; Yam, R.; Bercovic, G.; Sagiv, J. In Thin Films; Ulman, A., Ed.; Academic: San Diego, 1995; Vol. 20, pp 41-68.
    • (1995) Thin Films , vol.20 , pp. 41-68
    • Maoz, R.1    Yam, R.2    Bercovic, G.3    Sagiv, J.4
  • 43
    • 5344251537 scopus 로고    scopus 로고
    • note
    • Assuming that all paraffinic tails of an ordered monolayer are perpendicular to the substrate surface and that the C-H bonds are parallel to it with random in-plane orientation, half of the C-H bonds should be statistically available for interaction with the electric field of the incoming IR beam in the normal incidence geometry. Upon three-dimensional randomization of the paraffinic tails, 1/3 of the C-H bonds will point in the direction of propagation of the IR beam, so that the measured absorbance should decrease by a factor of 2/3 compared to that of a perfectly ordered monolayer.
  • 45
    • 85088542657 scopus 로고    scopus 로고
    • note
    • 34 can interact with the out-of-plane C-H vibrations of disordered paraffinic tails, which is not possible in the case of a perfectly ordered monolayer where all C-H vibrations are parallel to the layer plane.
  • 47
    • 5344233918 scopus 로고    scopus 로고
    • note
    • -1) upon adsorption of a compact monolayer of the latter.
  • 50
    • 85088543377 scopus 로고    scopus 로고
    • note
    • 2+ carboxylate salt (see also refs 42 and 45).
  • 52
    • 5344233275 scopus 로고    scopus 로고
    • note
    • The intensity of the XPS carbon line arising from the carboxylic carbon is lower than its expected stoichiometric contribution (5%, i.e. one out of the 20 carbon atoms of the AA molecule) because of the COOH groups' location at the monolayer-substrate interface and the consequent attenuation of the carboxyl carbon signal by the monolayer hydrocarbon core extending away from this interface. Since the expected decrease in thickness of the depleted monolayer following irradiation should cause a relative enhancement of the XPS signals contributed by bottom-located atoms, the actual loss of carboxylic carbon may be even somewhat larger than that directly deduced from the experimental data.
  • 56
    • 85088544601 scopus 로고    scopus 로고
    • note
    • 34 with the ZnSe surface.
  • 59
    • 5344230555 scopus 로고    scopus 로고
    • note
    • 2 groups, which take place in the film without a net loss of material from the surface or major degradation of its hydrocarbon core.
  • 60
    • 85088541975 scopus 로고    scopus 로고
    • note
    • 7
  • 64
    • 5344231934 scopus 로고    scopus 로고
    • note
    • 9 might also be strongly influenced by surface-charging effects.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.