Poly(ethylene glycol) self-assembled monolayer island growth.
Here, we report a study of the morphology and growth dynamics of a self-assembled monolayer (SAM) of the amide containing poly(ethylene glycol) (PEG) thiol (CH3O(CH2CH2O)17NHCO(CH2)2SH) on atomically flat Au(111) surfaces. SAM growth from a 20 muM 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.
Rundqvist
Jonas
J
Nanostructure Physics, AlbaNova University Center, Royal Institute of Technology, Roslagsvägen 30 B, SE-106 91 Stockholm, Sweden.
Hoh
Jan H
JH
Haviland
David B
DB
D018625:Microscopy, Atomic Force; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry*
D011092:Polyethylene Glycols