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  • 09월 03일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of adsorbate electrophilicity and sharp tips on single gold nanobipyramids.

등록일
2018년 8월 22일 13시 39분 38초
접수번호
2513
발표코드
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발표시간
목 09시 : 45분
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
Gold nanoparticles behave as strong absorbers and scatterers because of localized surface plasmon resonance (LSPR) which is coherent oscillation of conduction electrons at the surface of plasmonic nanoparticle stimulated by the electromagnetic field of incident light. The LSPR peak shift is caused by changes in the medium dielectric constant. However, our understanding of the effects of electrophilicity of thiol molecules adsorbed on gold nanoparticle surfaces is still unsatisfied. In this study, we present dark-field (DF) scattering studies on electrophilicity effect of adsorbate molecules with real time measurement at the single particle level. We found that LSPR wavelength of the gold nanobipyradmids (AuBPs) was red-shifted as thiol mulecules were adsorbed onto their surface. The electrophilicity of adsorbate molecules was strongly affected to degree of red-shift. Furthermore, the red shift of LSPR wavelength of single AuBPs were rapidly saturated in real-time measurement. This result indicate that AuBPs are highly sensitive to thiol molecules because of the sharp tips and can be used to develop highly sensitive LSPR biosensors.

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