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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Plasmonic sensing of biotin-BSA proteins by chemical interface damping of single gold nanorods.

등록일
2018년 8월 22일 11시 14분 33초
접수번호
2606
발표코드
ANAL2.O-19 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 10시 : 50분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
공동저자
SeongWoo Moon, Ji Won Ha*
Department of Chemistry, University of Ulsan, Korea
Chemical interface damping (CID) is one of the main decay processes that result in the broadening of the homogeneous localized surface plasmon resonance (LSPR) linewidth in plasmonic gold nanoparticles. However, it is the most poorly understood damping mechanism in gold nanoparticles. Herein, to better understand CID, we performed scanning electron microscopy (SEM) correlated dark-field (DF) scattering studies of single gold nanorods (AuNRs). First, we examined size-dependent broadening of the homogeneous LSPR linewidth in single AuNRs with three different aspect ratios (ARs) at a fixed diameter of 25 nm. The LSPR linewidth increased with decreasing the AR of single AuNRs because of the reduced average distance of hot electrons to the surface. Second, we examined the effect of adsorbate thiol molecules on the homogeneous LSPR linewidth in single AuNRs. The LSPR linewidth was broadened with increasing the carbon chain length of 1-alkanethiol. Third, we investigated the effect of refractive index variation of the surrounding medium on the LSPR linewidth in single AuNRs of three different sizes. The LSPR linewidth remained almost constant while increasing the dielectric constant of the medium. Last, we confirmed that CID-based biosensors can be used to detect real biological molecules such as bovine serum albumin (BSA) conjugated with biotin.

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