Surface stress of polyelectrolyte adsorption measured by micromechanical cantilever sensors

Masaya Toda, Akiko Nakamura Itakura, Karsten Büscher, Karlheinz Graf, Rüdiger Berger

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We studied the mechanical stress during the adsorption process of polyallylamine hydrochloride (PAH) and polystyrenesulfonate (PSS) polyelectrolytes using highly sensitive micromechancial cantilever sensors (MCS). Single side adsorption was achieved by functionalizing individual MCS with a 2-mercatoethylamine (2-MEA) self-assembled monolayers. Exposure of the MCS to PAH solution resulted in a constant surface stress change of 1.6±0.2 N/m between the 2-MEA functionalized and silicon sensors. We attribute the surface stress change to the formation of a stable PAH polyelectrolyte layer on top of the silicon surface. We found that a second layer consisting of PSS did not result in a negligible surface stress change.

Original languageEnglish
Pages (from-to)96-99
Number of pages4
Journale-Journal of Surface Science and Nanotechnology
Volume4
DOIs
Publication statusPublished - 2006 Jan 19
Externally publishedYes

Keywords

  • Adsorption kinetics
  • Biological molecules
  • Biosensing and devices
  • Nano-films
  • Surface stress

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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