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

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of Adsorbate Electrophilicity and Spiky Uneven Surfaces on Single Gold Nanourchin-based Localized Surface Plasmon Resonance Sensors

등록일
2017년 8월 17일 13시 18분 34초
접수번호
3011
발표코드
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발표시간
목 09시 : 40분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
공동저자
geunwan kim, JI WON HA*
Department of Chemistry, University of Ulsan, Korea
We present single particle studies on urchin-shaped gold nanoparticles for their use as localized surface plasmon resonance (LSPR) biosensors under dark-field (DF) microscopy. First, the LSPR wavelength of single gold nanourchins (AuNUs) was red-shifted as thiol molecules were attached onto the surface. AuNUs with sharp tips showed higher sensitivity for detecting thiol molecules than gold nanospheres (AuNSs) of similar size. Second, the degree of red shift was strongly affected by the electrophilicity of adsorbate molecules on the nanoparticle surface. Single AuNUs capped with 4-nitrothiophenol (4-NTP) strong electron withdrawing groups (EWG) caused a larger red shift than those coated with 4-aminothiophenol (4-ATP) strong electron donating groups (EDG). Last, real-time monitoring of molecular binding events on single AuNUs was performed. The LSPR peak was red-shifted and saturated after introducing 1 μM of 4-aminothiophenol. Therefore, single AuNUs were highly sensitive to changes in medium dielectric constant as well as the electrophilicity of attached thiol molecules. The results indicate that single AuNUs with sharp tips can be used to develop highly sensitive LSPR biosensors.

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