pH-dependent surface-enhanced Raman scattering of aromatic molecules on graphene oxide
Article first published online: 21 DEC 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 44, Issue 1, pages 75–80, January 2013
How to Cite
Liu, Z., Li, S., Hu, C., Zhang, W., Zhong, H. and Guo, Z. (2013), pH-dependent surface-enhanced Raman scattering of aromatic molecules on graphene oxide. J. Raman Spectrosc., 44: 75–80. doi: 10.1002/jrs.4142
- Issue published online: 9 JAN 2013
- Article first published online: 21 DEC 2012
- Manuscript Accepted: 1 JUN 2012
- Manuscript Revised: 21 MAY 2012
- Manuscript Received: 30 NOV 2011
- graphene oxide;
- surface-enhanced Raman scattering;
- aromatic molecule;
Graphene has become an ideal substrate for surface-enhanced Raman scattering (SERS) to study the chemical enhancement mechanism. In comparison with mechanically exfoliated graphene, graphene oxide (GO) has been found to be a better substrate due to its highly negatively charged oxygen functional groups. In this work, the pH-dependent SERS effect of aromatic molecules on GO are investigated. The results demonstrate that the Raman enhancement of dyes deposited on GO performs differently over a wide range of pH values (2 to 10). Adsorption experiments show that the pH-dependent SERS effect is closely related to the adsorption of aromatic molecules on GO, which is dominated by the electrostatic interaction. Thus, the influence of pH in GO-mediated SERS should be carefully considered, especially in its biomedical application. Copyright © 2012 John Wiley & Sons, Ltd.