Here, we report a study of the morphology and growth dynamics of a self-assembled monolayer (SAM) of the amide containing polyethylene glycol) (PEG) thiol (CH 3O(CH 2CH 2O) 17NHCO(CH 2) 2SH) on atomically flat Au(111) surfaces. SAM growth from a 20 μM ethanolic solution reveals island growth through three distinct steps: island nucleation, island growth, and coalescence. The coalescence-step, filling voids in the SAM, is by far slowest. The fine structure study reveals dendritic island formation, an observation which can be explained by attractive intermolecular interactions and surface diffusion-limited aggregation. We have also observed a change in the island height, which peaks during the island growth phase. This height change can be associated with a molecular conformational transition.
|Original language||English (US)|
|Number of pages||7|
|State||Published - Mar 29 2005|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces