119th General Meeting of the KCS

Type Poster Presentation
Area 분석화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code ANAL.P-201
Subject Optical Properties of Urchin-Shaped Gold Nanoparticles under Single Particle Spectroscopy
Authors 김근완, 하지원*
울산대학교 화학과, Korea
Abstract Plasmonic gold nanoparticles have received much attention because of their unique size- and shape-dependent optical properties induced by localized surface plasmon resonance (LSPR) effect. In this study, we investigated the optical properties of urchin-shaped gold nanoparticles with sharp and short tips on their surface under single particle microscopy and spectroscopy. We employed scattering-based dark-field (DF) and differential interference contrast (DIC) microscopy to elucidate the optical properties of gold nanourchins (AuNUs) at the single particle level. First, we found that the LSPR peak is redshifted for single AuNUs with sharp spikes on their surface in comparison to spherical gold nanoparticles with same size. Second, we obtained the defocused images of single AuNUs under DF microscopy, which provided three-dimensional (3D) spatial scattering field distributions. Last, we found polarization-dependent DIC images and intensities of single AuNUs under interference-based DIC microscopy, which was not observed for gold nanospheres without sharp tips. Therefore, the results allow us to have a better understanding of the optical properties of single AuNUs with the spiked surface.
E-mail geunwan2@naver.com