Force titration of amino group-terminated self-assembled monolayers of 4-aminothiophenol on gold using chemical force microscopy
Date of Issue1998
School of Materials Science and Engineering
Chemical force microscopy (CFM) was used to measure the adhesion force between NH2-terminated probe tip and gold substrate modified with self-assembled monolayers (SAMs) of 4-aminothiophenol (4-ATP). The curve of adhesion force as a function of solution pH value (force titration curve) was obtained. The pK1/2 of surface NH2 group of 4-ATP SAMs obtained from the force titration curve is 5.3, comparable with pK1/2=4.9 determined by the conventional contact angle titration.
Thin solid films
© 1998 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Thin Solid Films, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: http://dx.doi.org/10.1016/S0040-6090(98)00785-8.