SERS Titration of 4-Mercaptopyridine Self-Assembled Monolayers at Aqueous Buffer/Gold Interfaces
- Creators
- Yu, Hua-Zhong
- Xia, Nan
- Liu, Zhong-Fan
Abstract
Determination of the surface pK_a of self-assembled monolayers (SAMs) at aqueous buffer/gold interfaces using surface-enhanced Raman scattering (SERS) measurements, namely, SERS titration, is reported for the first time. From the analysis of pH-dependent SERS spectra of 4-mercaptopyridine monolayers on gold, the pK_(1/2) (3.9 ± 0.2) was determined. By further correlating the surface pH value with the bulk pH value in terms of the Gouy−Chapmann model, the surface pK_a (5.3 ± 0.3) was evaluated accordingly. Compared to the conventional contact angle titration, SERS titration has the advantage of giving further insight into the microscopic and dynamic information of the surface-confined functional groups. In addition, such a technique has high sensitivity, micrometer spatial resolution, and chemical selectivity.
Additional Information
© 1999 American Chemical Society. Publication Date (Web): February 24, 1999. We acknowledge the generous support of the National Committee of Science and Technology, the Educational Committee, and the National Natural Science Foundation of China. Dr. T. Zhu is thanked for his valuable discussion and help in some experiments. H.-Z.Y. thanks Drs. J. S. Baskin and C. N. Shi for their help in the preparation of this manuscript.Additional details
- Eprint ID
- 83686
- Resolver ID
- CaltechAUTHORS:20171205-083216566
- National Committee of Science and Technology (China)
- Educational Committee (china)
- National Natural Science Foundation of China
- Created
-
2017-12-08Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field