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Volumn 128, Issue 15, 2006, Pages 5231-5243

Molecular self-assembly at bare semiconductor surfaces: Preparation and characterization of highly organized octadecanethiolate monolayers on GaAs(001)

Author keywords

[No Author keywords available]

Indexed keywords

GOLD; HYDROPHOBICITY; ISOTOPES; LATTICE CONSTANTS; MONOLAYERS; SEMICONDUCTOR MATERIALS;

EID: 33646141401     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja058657d     Document Type: Article
Times cited : (123)

References (117)
  • 1
    • 0345979435 scopus 로고    scopus 로고
    • Ulman, A. Chem. Rev. 1996, 96, 1533-1554.
    • (1996) Chem. Rev. , vol.96 , pp. 1533-1554
    • Ulman, A.1
  • 10
  • 67
    • 33646122164 scopus 로고    scopus 로고
    • note
    • Data given in Supporting Information.
  • 78
  • 101
    • 33646146368 scopus 로고    scopus 로고
    • note
    • Supporting Information.
  • 105
    • 33646152289 scopus 로고    scopus 로고
    • note
    • A small tail on the high binding energy region of both the Ga 3d and As 3d regions could be attributed to either the inelastic collision of photoelectrons or to a trace amount of oxidation remaining on the substrate. Both higher resolution XPS experiments and time-of-flight secondary mass spectrometry measurements are currently underway to further examine the completeness of oxide removal. In addition these experiments will probe more deeply into the nature of the S-(GaAs) interface bonding.
  • 106
    • 33646133608 scopus 로고    scopus 로고
    • note
    • We report only the TPD 1RS spectra with p-polarized light. The s polarized spectra are an order of magnitude weaker and, when combined with thermal instabilities in the baseline during heating, make interpretation somewhat problematic, particularly at the higher temperatures where short scan times are needed to obtain data during rapid changes in the SAMs.
  • 108
    • 33646155717 scopus 로고    scopus 로고
    • note
    • Note that above 413 K precise the values of the peak frequencies show increasing error with increasing temperature since the corresponding intensities are becoming increasingly weaker.
  • 109
    • 0000060512 scopus 로고
    • It has been noted that Ga-S bonds are more thermodynamically favored over As-S bonds and the latter begin to convert to Ga-S bonds at ∼473 K. Scimeca, T.; Muramatsu, Y.; Oshima, M.; Oigawa, H.; Nannichi, Y. Phys. Rev. B 1991, 44, 12927-12932. If ODT monolayers bind predominately through As-S bonds, then the breaking of these bonds at ∼473 K could be one explanation for the irreversible desorption of the ODT monolayers on GaAs.
    • (1991) Phys. Rev. B , vol.44 , pp. 12927-12932
    • Scimeca, T.1    Muramatsu, Y.2    Oshima, M.3    Oigawa, H.4    Nannichi, Y.5
  • 112
    • 0001143320 scopus 로고
    • 2 exhibit high HD contact angles, while IRS data show considerable disorder. These data were interpreted in terms of "tufting" of the alkyl chains near the surface. (Allara, D. L.; Parikh, A. N.; Judge, E. J. Chem. Phys. 1994, 100, 1761-1764).
    • (1994) J. Chem. Phys. , vol.100 , pp. 1761-1764
    • Allara, D.L.1    Parikh, A.N.2    Judge, E.3
  • 115
    • 33646161418 scopus 로고    scopus 로고
    • unpublished results
    • To directly image the tops of the molecules a minimum of 5 nN forces are typically used (e.g., for alkanethiolates/Au{111}). Use of these magnitude-forces consistently resulted in damage to the samples, and reducing normal forces below the damage point did not result in molecular resolution. He scattering is well-known to be extremely sensitive to surface roughness and requires atomically smooth surfaces to produce diffraction peaks. In preliminary experiments only diffuse scattering of the He atoms was observed with no evidence for diffraction peaks. (Danisman, F.; McGuiness, C.; Scoles, G.; Allara, D., unpublished results).
    • Danisman, F.1    McGuiness, C.2    Scoles, G.3    Allara, D.4
  • 117
    • 33646131023 scopus 로고    scopus 로고
    • note
    • Over an extended period working with this system, using many different preparation conditions, we have noticed that the alkanethiolate SAMs on GaAs(001) appear to fall into two classes of either a near vertical chain orientation or a highly tilted structure. This leads us to suspect that the GaAs surface is prone to reconstruction, especially at elevated temperatures, and that the process is somewhat driven by chain packing such that there are two preferred lattices with the lower temperature conditions leading to the spacings associated with near vertical chains.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.