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|
| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-210 |
| Subject |
Surface Adsorption on Gold Nanoparticles Assisted by CTAB |
| Authors |
Juhyun Yeo, YOONSOO PANG*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
|
| Abstract |
Intrinsically small Raman signals are enormously enhanced when organic molecules are adsorbed on metal nanosurfaces of specific shapes, sizes, or kinds. This is called surface enhanced Raman spectroscopy (SERS), and the surface adsorption of a molecule can be inferred by the spectral features of surface enhanced Raman (SER) spectra of adsorbates. In this research, a simple method of modifying surface properties of citrate-reduced gold nanoparticles (AuNP) using cetyl trimethylammonium bromide (CTAB) has been investigated. Many organic molecules including hydroxyanthraquinone derivatives (HAQs), flavonoids, and many natural and artificial drug molecules which do not have any functional group for efficient surface adsorption on silver or gold nanoparticles may be difficult to be applied to many vibrational sensors using SERS. In this research, the surface of citrate-reduced gold nanoparticles were modified with CTAB for the efficient aggregation which is in many cases the prerequisite of huge SER enhancements. The SERS of HAQs and many other adsorbates were greatly enhanced after the optimization of the CTAB concentration and it seems that CTAB is inevitable in the efficient aggregation of the AuNP and Raman enhancements due to induced surface plasmon of aggregates. In addition, the changes in the surface adsorption geomentry and molecular structure of alizarin (1, 2-dihydroxyanthraquinone) have been investigated by changing the solution pH. |
| E-mail |
yeojh@gist.ac.kr |
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121st General Meeting of the KCS