Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains

S. J. Stranick, A. N. Parikh, Y. T. Tao, D. L. Allara, P. S. Weiss

Research output: Contribution to journalArticle

337 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)7636-7646
Number of pages11
JournalJournal of Physical Chemistry
Volume98
Issue number31
StatePublished - 1994
Externally publishedYes

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Self assembled monolayers
Phase separation
scanning tunneling microscopy
Scanning tunneling microscopy
Chemical analysis
Molecules
ellipsometry
self assembly
molecules
Ellipsometry
chemical composition
molecular structure
Adsorbates
solubility
infrared spectroscopy
Chain length
photoelectron spectroscopy
Gold
Self assembly
gold

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Stranick, S. J., Parikh, A. N., Tao, Y. T., Allara, D. L., & Weiss, P. S. (1994). Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains. Journal of Physical Chemistry, 98(31), 7636-7646.

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 journalArticle

Stranick, SJ, Parikh, AN, Tao, YT, Allara, DL & Weiss, PS 1994, 'Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains', Journal of Physical Chemistry, vol. 98, no. 31, pp. 7636-7646.
Stranick, S. J. ; Parikh, A. N. ; Tao, Y. T. ; Allara, D. L. ; Weiss, P. S. / Phase separation of mixed-composition self-assembled monolayers into nanometer scale molecular domains. In: Journal of Physical Chemistry. 1994 ; Vol. 98, No. 31. pp. 7636-7646.
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