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Atomic force microscopy evidence of citrate displacement by 4-mercaptopyridine on gold in aqueous solution

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Atomic force microscopy evidence of citrate displacement by 4-mercaptopyridine on gold in aqueous solution

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dc.contributor.author Zhang, Hua
dc.contributor.author He, Hui-Xin
dc.contributor.author Wang, Jian
dc.contributor.author Liu, Zhong-Fan
dc.date.accessioned 2012-09-24T07:41:00Z
dc.date.available 2012-09-24T07:41:00Z
dc.date.copyright 2000
dc.date.issued 2012-09-24
dc.identifier.citation Zhang, H., He, H. X., Wang, J., & Liu, Z. F. (2000). Atomic force microscopy evidence of citrate displacement by 4-mercaptopyridine on gold in aqueous solution. Langmuir, 16(10), 4554-4557.
dc.identifier.issn 0743-7463
dc.identifier.uri http://hdl.handle.net/10220/8627
dc.description.abstract The displacement adsorption process of 4-mercaptopyridine (4-MP) on trisodium citrate preadsorbed gold surface in aqueous solution was studied using atomic force microscopy (AFM). The measurement was done by monitoring the interaction force between a gold-coated AFM tip and a gold substrate, both presaturated by trisodium citrate. The addition of 4-MP was found to result in a remarkable change of tip−substrate adhesion force, which showed a gradual increase and finally reached a maximum. Using the chemical force titration technique, we estimated the surface pK1/2 of thus-formed 4-MP displacement film and compared with pure 4-MP self-assembled monolayer (SAM) formed on gold in ethanol solution. Our results indicate that the 4-MP molecules are more strongly adsorbed on gold than citrate anions, mostly via Au−S bonding, forming a less dense and mixed displacement film. The displacement adsorption kinetics seems very fast and it takes only ca. 2 min to establish more than 50% surface coverage of 4-MP molecules.
dc.language.iso en
dc.relation.ispartofseries Langmuir
dc.rights © 2000 American Chemical Society.
dc.subject DRNTU::Engineering::Materials.
dc.title Atomic force microscopy evidence of citrate displacement by 4-mercaptopyridine on gold in aqueous solution
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1021/la9904657

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