Abstract
Scanning tunneling microscopy has been used to demonstrate phase segregation in varied composition, two-component self-assembled monolayers on gold. These monolayer films were assembled using CH3(CH2)15SH and CH3O2C(CH2)15SH, two similar alkanethiol molecules which are non-hydrogen-bonding and have identical alkyl chain lengths. X-ray photoelectron spectroscopy, infrared spectroscopy, and ellipsometry have been used to characterize the average chemical compositions and average molecular structures of these films. Scanning tunneling microscopy of single composition, self-assembled monolayers of each of these molecules shows a preponderance of defects which can be attributed to single missing chains. In mixed composition films, we observe nanometer scale molecular domains with time-dependent shapes. These observations have important implications both for the fundamental understanding of solubilities and phase segregation in quasi-two-dimensional mixtures and for applications of self-assembly in which spatial patterns of adsorbate mixtures are important.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7636-7646 |
| Number of pages | 11 |
| Journal | Journal of Physical Chemistry |
| Volume | 98 |
| Issue number | 31 |
| State | Published - 1994 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
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Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains. / Stranick, S. J.; Parikh, A. N.; Tao, Y. T.; Allara, D. L.; Weiss, P. S.
In: Journal of Physical Chemistry, Vol. 98, No. 31, 1994, p. 7636-7646.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains
AU - Stranick, S. J.
AU - Parikh, A. N.
AU - Tao, Y. T.
AU - Allara, D. L.
AU - Weiss, P. S.
PY - 1994
Y1 - 1994
N2 - Scanning tunneling microscopy has been used to demonstrate phase segregation in varied composition, two-component self-assembled monolayers on gold. These monolayer films were assembled using CH3(CH2)15SH and CH3O2C(CH2)15SH, two similar alkanethiol molecules which are non-hydrogen-bonding and have identical alkyl chain lengths. X-ray photoelectron spectroscopy, infrared spectroscopy, and ellipsometry have been used to characterize the average chemical compositions and average molecular structures of these films. Scanning tunneling microscopy of single composition, self-assembled monolayers of each of these molecules shows a preponderance of defects which can be attributed to single missing chains. In mixed composition films, we observe nanometer scale molecular domains with time-dependent shapes. These observations have important implications both for the fundamental understanding of solubilities and phase segregation in quasi-two-dimensional mixtures and for applications of self-assembly in which spatial patterns of adsorbate mixtures are important.
AB - Scanning tunneling microscopy has been used to demonstrate phase segregation in varied composition, two-component self-assembled monolayers on gold. These monolayer films were assembled using CH3(CH2)15SH and CH3O2C(CH2)15SH, two similar alkanethiol molecules which are non-hydrogen-bonding and have identical alkyl chain lengths. X-ray photoelectron spectroscopy, infrared spectroscopy, and ellipsometry have been used to characterize the average chemical compositions and average molecular structures of these films. Scanning tunneling microscopy of single composition, self-assembled monolayers of each of these molecules shows a preponderance of defects which can be attributed to single missing chains. In mixed composition films, we observe nanometer scale molecular domains with time-dependent shapes. These observations have important implications both for the fundamental understanding of solubilities and phase segregation in quasi-two-dimensional mixtures and for applications of self-assembly in which spatial patterns of adsorbate mixtures are important.
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M3 - Article
AN - SCOPUS:5844372499
VL - 98
SP - 7636
EP - 7646
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
SN - 0022-3654
IS - 31
ER -