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|
| Type |
Poster Presentation |
| Area |
Analytical Chemistry |
| Room No. |
Grand Ballroom |
| Time |
10월 19일 (금요일) 11:00~12:30 |
| Code |
ANAL.P-359 |
| Subject |
Effect of adsorbate electrophilicity and sharp tips on single gold nanobipyramids. |
| Authors |
Geunwan Kim, Ji Won Ha*
Department of Chemistry, University of Ulsan, Korea
|
| Abstract |
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. |
| E-mail |
geunwan2@naver.com |
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122nd General Meeting of the KCS