Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy
Chemical force microscopy (CFM) was used to measure the adhesion force between an Au-coated Si3N4 tip functionalized with OH groups and a silicon substrate functionalized with NH2 groups. The curve of the adhesion force as a function of the solution pH value (force titration curve) was obtained. The...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2012
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| Online Access: | https://hdl.handle.net/10356/95685 http://hdl.handle.net/10220/8325 |
| _version_ | 1826127756991135744 |
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| author | Zhang, Hua He, Hui-Xin Wang, J. Mu, Tao Liu, Zhong-Fan |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhang, Hua He, Hui-Xin Wang, J. Mu, Tao Liu, Zhong-Fan |
| author_sort | Zhang, Hua |
| collection | NTU |
| description | Chemical force microscopy (CFM) was used to measure the adhesion force between an Au-coated Si3N4 tip functionalized with OH groups and a silicon substrate functionalized with NH2 groups. The curve of the adhesion force as a function of the solution pH value (force titration curve) was obtained. The pK1=2 of surface NH2 groups estimated from the force titration curve is 7:4, about 3 pK units lower than the pK value of NH2 functionality in aqueous solution, and in nice agreement with the value of pK1=2 D 7:6 determined by conventional contact angle titration. The surface pK1=2 value that we obtained from the force titration or contact angle titration is the apparent surface pK value, which is expressed as the corresponding bulk solution pH value at which the functional groups at the interface are half-ionized. |
| first_indexed | 2024-10-01T07:14:03Z |
| format | Journal Article |
| id | ntu-10356/95685 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:14:03Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/956852023-07-14T15:44:41Z Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy Zhang, Hua He, Hui-Xin Wang, J. Mu, Tao Liu, Zhong-Fan School of Materials Science & Engineering DRNTU::Science::Chemistry::Biochemistry Chemical force microscopy (CFM) was used to measure the adhesion force between an Au-coated Si3N4 tip functionalized with OH groups and a silicon substrate functionalized with NH2 groups. The curve of the adhesion force as a function of the solution pH value (force titration curve) was obtained. The pK1=2 of surface NH2 groups estimated from the force titration curve is 7:4, about 3 pK units lower than the pK value of NH2 functionality in aqueous solution, and in nice agreement with the value of pK1=2 D 7:6 determined by conventional contact angle titration. The surface pK1=2 value that we obtained from the force titration or contact angle titration is the apparent surface pK value, which is expressed as the corresponding bulk solution pH value at which the functional groups at the interface are half-ionized. Accepted version 2012-07-13T03:58:43Z 2019-12-06T19:19:49Z 2012-07-13T03:58:43Z 2019-12-06T19:19:49Z 1998 1998 Journal Article Zhang, H., He, H.-X., Wang, J., Mu, T., & Liu, Z.-F. (1998). Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy. Applied physics A : materials science & processing, 66, S269-S271. https://hdl.handle.net/10356/95685 http://hdl.handle.net/10220/8325 10.1007/s003390051143 en Applied physics A : materials science & processing © 1998 Springer. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Physics A: Materials Science & Processing, Springer. 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/10.1007/s003390051143]. application/pdf |
| spellingShingle | DRNTU::Science::Chemistry::Biochemistry Zhang, Hua He, Hui-Xin Wang, J. Mu, Tao Liu, Zhong-Fan Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title | Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title_full | Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title_fullStr | Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title_full_unstemmed | Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title_short | Force titration of amino group-terminated self-assembled monolayers using chemical force microscopy |
| title_sort | force titration of amino group terminated self assembled monolayers using chemical force microscopy |
| topic | DRNTU::Science::Chemistry::Biochemistry |
| url | https://hdl.handle.net/10356/95685 http://hdl.handle.net/10220/8325 |
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