Force titration of amino group-terminated self-assembled monolayers of 4-aminothiophenol on gold using chemical force microscopy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)778-780
Journal / PublicationThin Solid Films
Publication statusPublished - 31 Aug 1998
Externally publishedYes


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.

Research Area(s)

  • Adhesion force, Chemical force microscopy, Contact angle titration, Force titration, Self-assembled monolayer, Surface pK1/2 value