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제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Label-free Optical Biosensor Based on Chemical Interface Damping Using Gold-nanorods

등록일
2017년 8월 14일 15시 14분 40초
접수번호
3010
발표코드
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발표시간
목 09시 : 38분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
공동저자
SeongWoo Moon, JI WON HA*
Department of Chemistry, University of Ulsan, Korea
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). As the line width increases, sensing becomes possible without being affected by the dielectric constant. We propose a biosensing method based on CID by confirming the change of the optical characteristics according to the aspect ratio and the broadening of the plasmon line width of the rod-shaped gold nanoparticles by using three kinds of gold nanorods having different aspect ratios.

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