122nd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists II
Room No. Room 321
Time FRI 10:00-:
Code ANAL2.O-9
Subject The Effect of Electrophilicity of Thiol Molecules in Chemical Interface Damping of Single Triangular Gold Nanoplates
Authors Junho Lee, Ji Won Ha*
Department of Chemistry, University of Ulsan, Korea
Abstract Plasmonic nanoparticles have been extensively studied for various applications such as photocatalyst, bio-sensor, orientation probe, photothermal cancer therapy etc. This is because they exhibit unique size and shape dependent optical properties resulted from the localized surface plasmon resonance (LSPR) effect. The LSPR is vibration of free electrons in the conduction band induced by interaction with an electromagnetic field. Recently, two-dimensional (2D) triangular gold nanoplates (AuNPs) are of great interest in many applications such as nanocatalysis and biosensors due to their characteristic LSPR property caused by triangular shape. However, chemical interface damping in single AuNPs at the single particle level has not yet been studied so far. In this study, we characterized the optical properties of single AuNPs and thiolate effect under dark-field (DF) microscopy. The LSPR damping was observed for single thiol-capped AuNPs due to chemical interface damping effect on their surface under single particle scattering spectroscopy. Furthermore, thiol molecules with strong electron withdrawing group (EWG) was compared to strong electron donating group (EDG) on chemical interface damping in single AuNPs. Therefore, we found the potential use of single AuNPs as plasmonic biosensors using this chemical interface damping.
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