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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of Adsorbate Molecules on Chemical Interface Damping in Single Gold Bipyramids with Sharp Tips

등록일
2017년 8월 7일 11시 23분 15초
접수번호
3006
발표코드
ANAL1.O-8 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 09시 : 30분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
공동저자
SOYOUNG LEE, JI WON HA*
Department of Chemistry, University of Ulsan, Korea
Single metallic nanoparticles are gaining much attention as an attractive biomolecular sensor. Especially, gold bipyramids (AuBPs) are expected to be a promising material for biosensors to have high detection sensitivity due to its sharper tips compared with spherical gold nanoparticle or rod-shape gold nanoparticle. They have higher sensitivity to refractive index of attached target molecules than spherical gold nanoparticles and gold nanorods. However, the conventional localized surface plasmon resonance (LSPR) sensing mechanism is affected by both the change of dielectric medium constant and the chemical adsorption onto the nanoparticle surface. Herein, we performed single particle spectroscopic study to characterize the effect of the medium dielectric constant and chemical binding of various thiol molecules on the LSPR linewidth in single AuBPs. More specifically, we demonstrate how chemical binding of various adsorbate molecules affects the LSPR linewidth of the longitudinal surface plasmon of single AuBPs. We found that the LSPR linewidth of single AuBPs remains almost constant when varying the refractive index of surrounding medium. However, thiol binding resulted in the redshift and broadening of LSPR spectrum of single AuBPs. Therefore, the results suggest that chemical interface damping of single AuBPs can be used to develop a LSPR biosensor that is only sensitively to the adsorption of biomolecules without interference from the dielectric constant of the surrounding medium.

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