The pH-dependent adhesion of nanoparticles to self-assembled monolayers on gold

Bowen, James; Manickam, Mayandithevar; Evans, Stephen D.; Critchley, Kevin; Kendall, Kevin and Preece, Jon A. (2008). The pH-dependent adhesion of nanoparticles to self-assembled monolayers on gold. Thin Solid Films, 516(10) pp. 2987–2999.

DOI: https://doi.org/10.1016/j.tsf.2007.11.002

Abstract

The effect of pH on the adhesion of silica and polystyrene latex nanoparticles, presenting hydroxyl and carboxylic acid surface chemistries respectively, to self-assembled monolayers (SAMs) has been investigated. The SAMs studied were 1-dodecanethiol, 11-mercaptoundecanoic acid and an original pyridine-terminated SAM. Adhesion of nanoparticles to the SAMs was found to decrease with increasing pH due to increased repulsive forces between surfaces, as a result of the deprotonation of surface moieties on the nanoparticles. A range of surface morphologies for the adsorbed nanoparticles was observed for the systems studied.

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