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| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 20일 (금요일) 13:00~14:30 |
| Code |
PHYS.P-114 |
| Subject |
Surface Adsorption of Hydroxyanthraquinones on CTAB-modified Gold Nanosurfaces |
| Authors |
Juhyun Yeo, YOONSOO PANG1,*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
1Division of Physical Chemistry, Gwangju Institute of Science and Technology, Korea
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| Abstract |
Adsorption of organic molecules onto metal nanosurfaces makes their Raman signal dramatically enhanced. It is called surface enhanced Raman spectroscopy (SERS), and spectral features of SER signal can provide detailed information on the surface adsorption geometry of a molecule on the metal surfaces. In this research, gold nanoparticles were used to obtain SER spectra of hydroxyanthraquinones (HAQs), and cetyl trimethylammonium bromide (CTAB) was used as a cationic co-adsorbate. When concentration of CTAB was optimized, sample color was turned abruptly, and SER signals of HAQs were dramatically enhanced. CTAB seems to make HAQs aggregated with gold nanoparticles, which is in line with an increase of absorption in longer wavelength region upon adding CTAB solution. Signal of alizarin SERS was gradually increased as pH of the sample increases, and this tendency supports that deprotonated alizarin can readily be adsorbed to gold nanoparticles whose surface is modified with CTAB. Two distinguishable SER spectra occurred upon changing pH imply that there are two or more aspects of adsorption geometry of alizarin on the gold surfaces modified with CTAB. |
| E-mail |
yeojh@gist.ac.kr |
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120th General Meeting of the KCS