Substrate effects in poly(ethylene glycol) self-assembled monolayers on granular and flame-annealed gold

Jonas Rundqvist, Jan H. Hoh, David B. Haviland

Research output: Contribution to journalArticle

Abstract

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)17NHCO(CH2)2SH (PEG17) on three types of Au films: thermally evaporated granular Au and two types of Au films from hydrogen flame annealing of granular Au, Au(111), and Au silicide. The different Au surfaces clearly affects the morphology and mechanical properties of the PEG17 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 PEG17, 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 PEG17 SAM was destroyed in a self-developing process while material deposition was dominant for the hard PEG17 SAM.

Original languageEnglish (US)
Pages (from-to)337-341
Number of pages5
JournalJournal of Colloid And Interface Science
Volume301
Issue number1
DOIs
StatePublished - Sep 1 2006

Keywords

  • AFM
  • Atomic force microscopy
  • EBL
  • Electron beam lithography
  • Flame-annealing
  • PEG
  • Poly(ethylene glycol)
  • SAM
  • Self-assembled monolayer
  • Silicide
  • Surface effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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