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Volumn 691, Issue 26, 2006, Pages 5809-5824

Modification and chemical transformation of Si(1 1 1) surface

Author keywords

Acrylate esters; Chemical transformation of modified surfaces; Hydrosilylation; Propiolate esters; Silicon surface

Indexed keywords

ESTERIFICATION; HYDROGEN; OLEFINS; SILICON COMPOUNDS; SURFACE REACTIONS; SURFACE TREATMENT; X RAY PHOTOELECTRON SPECTROSCOPY;

EID: 33751346632     PISSN: 0022328X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jorganchem.2006.09.048     Document Type: Article
Times cited : (10)

References (64)
  • 31
    • 33751308061 scopus 로고    scopus 로고
    • note
    • 298 value of A was previously reported as -6.1 kcal/mol [12]. This time, slightly more stable C-O single bond rotamer was obtained.
  • 32
    • 33751309014 scopus 로고    scopus 로고
    • note
    • 2 was used as a solvent, no formation of Si(1 1 1)-Cl was detected by XPS spectra (Cl 2p (200 eV) and Cl 2s (270 eV)) of the surfaces S1d, S1e and S2.
  • 33
    • 33751308783 scopus 로고    scopus 로고
    • note
    • For the reaction of Si(1 1 1)-H with 2b, formation of the surface S1b was assumed from the model reaction result. The reaction of 1 and 2b gave 3b as major product and no O-silylated product was identified. However, because of the reported results of competing reactions of Si(1 1 1)-H with C{double bond, long}C and OH groups [4c] and formation of Si-OR by thermal reaction of Si(1 1 1)-H and alcohols, [41] a close analysis of the surface will be needed to rule out the reaction of the OH groups with the Si-H bonds.
  • 35
    • 33751350778 scopus 로고    scopus 로고
    • note
    • The conflicting intensity of C-C and C{double bond, long}O in C 1s peak of XPS spectra for surface S2 may arise from contaminated carbon. The coverage ratio for S2 was estimated by C 1s (C{double bond, long}O) peak.
  • 37
    • 33751322279 scopus 로고    scopus 로고
    • note
    • x may include silicon oxidation both on the surface and under the surface (formation of silicon oxide layer in partial area).
  • 41
    • 33751310020 scopus 로고    scopus 로고
    • note
    • 3) leading to 14% coverage ratio was reported [8]. The comparable low coverage for S2 may also arise from the surface steric factor.
  • 42
    • 33751345972 scopus 로고    scopus 로고
    • note
    • The surface reaction does not require an explicit radical initiator or high reaction temperature, similar to the reaction of Si(1 1 1) with propiolate esters or tris(trimethylsilyl)silane with propiolate esters [12,8]. According to the proposed mechanism for the reaction of tris(trimethylsilyl)silane with propiolate esters [8] autoxidation of surface Si-H group by contaminated molecular oxygen to generate a silicon radical on the surface may be the speculative initial step of the total radical chain reaction.
  • 43
    • 33751323803 scopus 로고    scopus 로고
    • note
    • In order to examine the role of charge carriers and obtain some insight into the reaction mechanisms, the reaction of p-type Si(1 1 1)-H with trifluoroethyl propiolate was carried out. The reaction gave a 46% coverage ratio by F1s XPS spectra. We believe the value is similar to that of n-Si(1 1 1) within the experimental error and the effect of charge carriers may be small [42].
  • 46
    • 33751339626 scopus 로고    scopus 로고
    • Handbook of X-ray Photoelectron Spectroscopy; J. Chastain, ed.; Perkin-Elmer Corp., Physical Electronics Division: Eden Prairie, MN, 1992.
  • 54
    • 33751326011 scopus 로고    scopus 로고
    • note
    • x = 0.87).
  • 55
    • 33751348170 scopus 로고    scopus 로고
    • note
    • 3 gave the surface with 38% coverage by XPS. Further study on application to various surfaces is planned in due course.
  • 57
    • 33751312152 scopus 로고    scopus 로고
    • note
    • Surface S10 was prepared from reactions of Si(1 1 1)-H surface with octadecyl propiolate at room temperature for 40 h [8].
  • 58
    • 33751327426 scopus 로고    scopus 로고
    • note
    • -4 mol/L was prepared and measured by GC to draw the calibration plots. A linear relationship between the GC intensity (peak integral) and the solution concentration was obtained.
  • 59
    • 33751309762 scopus 로고    scopus 로고
    • note
    • 3) was also prepared from reaction of Si(1 1 1)-H surface with 4-trifluoromethylbenzyl propiolate [8] and subsequent reduction and GC analysis were performed. Coverage of surface S11 was estimated to be 24%, which is quite lower than that of 56% previously reported by XPS [8]. The possible loss of more volatile trifluoromethylbenzyl alcohol (b.p. 78-80 °C/4 mmHg) than 1-octadecanol (b.p. 170-171 °C/2 mmHg) during the concentration of the solution might cause the decrease of the coverage ratio. Investigation of other methods to preconcentrate other than evaporation (e.g. solid phase extraction) is required for volatile alcohols.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.