Substrate effects in poly(ethylene glycol) self-assembled monolayers on granular and flame-annealed gold
2006 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 301, no 1, 337-341 p.Article in journal (Refereed) Published
Poly(ethylene glycol) (PEG) self-assembled monolayers (SAMs) are surface coatings that efficiently prevent nonspecific adhesion of biomolecules to surfaces. Here, we report on SAM formation of the PEG thiol CH3O(CH2CH2O)(17)NHCO(CH2)(2)SH (PEG(17)) on three types of Au films: thermally evaporated granular An and two types of Au films from hydrogen flame annealing of granular Au, Au(111), and An silicide. The different Au surfaces clearly affects the morphology and mechanical properties of the PEG(17) SAM, which is shown by AFM topographs and force distance curves. The two types of SAMs found on flame-annealed Au were denoted soft and hard due to their difference in stiffness and resistance to scratching by the AFM probe. With the aim of nanometer scale patterning of the PEG(17), the SAMs were exposed by low energy (1 kV) electron beam lithography (EBL). Two distinctly different types of behaviour were observed on the different types of SAM; the soft PEG(17) SAM was destroyed in a self-developing process while material deposition was dominant for the hard PEG(17) SAM.
Place, publisher, year, edition, pages
2006. Vol. 301, no 1, 337-341 p.
self-assembled monolayer, SAM, poly(ethylene glycol), PEG, surface effects, flame-annealing, atomic force microscopy, AFM, electron beam lithography, EBL, silicide, protein surface interactions, polyethylene oxide, in-situ, microscopy, adsorption, silicide, systems, au
IdentifiersURN: urn:nbn:se:kth:diva-15899DOI: 10.1016/j.jcis.2006.05.012ISI: 000239538300041ScopusID: 2-s2.0-33746189791OAI: oai:DiVA.org:kth-15899DiVA: diva2:333941
QC 201005252010-08-052010-08-05Bibliographically approved