Poly(ethylene glycol) Self-Assembled Monolayer Island Growth
2005 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 21, 2981-2987 p.Article in journal (Refereed) Published
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)(17)NHCO(CH2)(2)SH) on atomically flat Au(111) surfaces. SAM growth from a 20 mu M 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.
Place, publisher, year, edition, pages
2005. Vol. 21, 2981-2987 p.
sum-frequency spectroscopy, size distribution, surface modification, protein adsorption, hydrogen-bonds, in-situ, gold, alkanethiols, microscopy, mechanisms
IdentifiersURN: urn:nbn:se:kth:diva-8845DOI: 10.1021/la0471792ISI: 000228042400052ScopusID: 2-s2.0-16244376824OAI: oai:DiVA.org:kth-8845DiVA: diva2:14309
QC 201010082005-12-022005-12-022010-10-08Bibliographically approved