Surface stress of polyelectrolyte adsorption measured by micromechanical cantilever sensors

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

doi:10.1380/ejssnt.2006.96

Conference -ISSS-4-

Surface stress of polyelectrolyte adsorption measured by micromechanical cantilever sensors

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

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Keywords: Adsorption kinetics, Biological molecules, Biosensing and devices, Nano-films, Surface stress

JOURNAL FREE ACCESS

2006 Volume 4 Pages 96-99

DOI https://doi.org/10.1380/ejssnt.2006.96

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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. [DOI: 10.1380/ejssnt.2006.96]

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