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|
| Type |
Poster Presentation |
| Area |
Analytical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 19일 (목요일) 11:00~12:30 |
| Code |
ANAL.P-245 |
| Subject |
Label-free Optical Biosensor Based on Chemical Interface Damping
Using Gold-nanorods
|
| Authors |
SeongWoo Moon, JI WON HA*
Department of Chemistry, University of Ulsan, Korea
|
| Abstract |
We studied the optical properties of gold nanorods using a darkfield microscope(DF) and a scanning electron microscope(SEM). The existing LSPR based biosensor was a method of sensing by the shift of the SPR peak when the target molecule was attached. However, the dielectric constant of the surrounding medium affects this sensing method. So, we propose a label-free plasmon-based biosensor that is sensitive to the adsorption of biomolecules without being disturbed by the dielectric constant of the surrounding medium. When thiol is attached to gold nanorods, wavelength shifts and FWHM (Full Width at Half Maximum) are increase. This is called chemical interface damping(CID). Also, it was confirmed that the size of the line width also changed when the type of thiol was changed. More specifically, we show how the chemical bonding of various adsorbate molecules affects the LSPR linewidth of a single AuNP longitudinal surface plasmon. As a result, as the line width increases, sensing becomes possible without being affected by the permittivity. We propose a biosensing method based on CID by confirming the change of optical characteristics according to the aspect ratio of plasmon nanoparticles and the width of plasmon line width using three types of gold nanorods with different aspect ratios. |
| E-mail |
tjddn806@naver.com |
|
121st General Meeting of the KCS