Force titration of self-assembled monolayer using chemical force microscopy

Huixin He, Chunzeng Li, Junmei Wang, Haoli Zhang, Xiaojie Xu, Zhongfan Liu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The concept of force titration was firstly proposed based on the technique of Chemical Force Microscopy (CFM). Self-Assembled Monolayer (SAM) on substrate surface can be titrated with buffer solutions at a nanometer scale by measuring the adhesion force between the SAM-modified substrate and probe tip. The plot of adhesion force vs pH value was termed as force titration curve. As an example, the titration behavior of ω-mercaptoundecanoic acid monolayer on gold has been studied. It was found that there is a big hump around pH 5 ∼ 6 in its force titration curve. Taking the contact angle titration result together, an interaction model for the monolayer was suggested from the chemical hysteresis point of view.

Original languageEnglish (US)
Pages (from-to)293-296
Number of pages4
JournalActa Physico - Chimica Sinica
Volume13
Issue number4
StatePublished - Dec 1 1997

Keywords

  • Adhesion force
  • Chemical force microscopy (CFM)
  • Force titration
  • Self-assembled monolayer (SAM)

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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