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Citation: He Hui-Xin, Li Chun-Zeng, Wang Jun-Mei, Zhang Hao-Li, Xu Xiao-Jie, Liu Zhong-Fan. Force Titration of Self-Assembled Monolayer Using Chemical Force Microscopy[J]. Acta Physico-Chimica Sinica, ;1997, 13(04): 293-296. doi: 10.3866/PKU.WHXB19970402 shu

Force Titration of Self-Assembled Monolayer Using Chemical Force Microscopy

1.
Center for Institute Materials Research(CIMR),College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China

Received Date: 27 December 1996
Available Online: 15 April 1997

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 w-mercaptoundecanoic acid monolayer on ld 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.
- Chemical force microscopy(CFM),
- Adhesion force,
- Force titration,
- Self-assembled monolayer(SAM)
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