Force titration of amino group-terminated self-assembled monolayers of 4-aminothiophenol on gold using chemical force microscopy
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....
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/95686 http://hdl.handle.net/10220/8335 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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