Observation of Phase-Separated Nanometer Scale Molecular Domains in Mixed Self-Assembled Monolayers
Technical rept. 1 Jun 1992-31 May 1993
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
Pagination or Media Count:
We demonstrate the phase separation into nanometer scale domains of two-component monolayers prepared by self-assembly on gold of CH3CH215SH and CH302CCH215SH, two similar, non-hydrogen bonding alkane thiols of identical alkyl chain length. By varying the fractions of the two components, we have learned to distinguish between domains of each molecule by scanning tunneling microscopy. These observations have important implications for both the scientific understanding of phase segregation in quasi-two-dimensional molecular mixtures and for applications of self-assembly in which the formation of spatially resolved mixed functional group surfaces is desired targeted. Further, these observations provide a caveat with regard to the common assumption of complete mixing in multi-component self-assembled monolayers.
- Organic Chemistry
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy