[8p-N204-1~18] 3.11 Nanoscale optical science and near-field optics

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8p-N204-7] Localized surface plasmon resonance properties of intermetallic nanoparticles with B8₁-type anisotropic crystal structure

〇HYUNJI LEE¹, Takekuma Haruka^1,2, Sato Ryota², Iida Kenji³, Teranishi Toshiharu^1,2 (1.Kyoto Univ., 2.ICR, Kyoto Univ., 3.ICAT, Hokkaido Univ.)

Keywords:

Localized surface plasmon resonance,Anisotropic crystal structure,Intermetallic nanoparticle

Localized surface plasmon resonance (LSPR) has been extensively studied and applied across various fields, including photocatalysis and biosensors. Spherical nanoparticles (NPs) composed of group 11 elements (Au, Ag, and Cu) are commonly employed as plasmonic materials in the visible region. Traditional research on plasmonic materials has primarily focused on NPs with isotropic crystal structures, such as face-centered cubic and C1 (CaF₂-type) structures. In this study, we explored plasmonic NPs with anisotropic crystal structures. Specifically, we synthesized intermetallic NPs with the anisotropic B8₁ (NiAs-type) structure, namely, PtSn NPs, and investigated their LSPR properties. The spherical PtSn NPs exhibited two distinct peaks at approximately 380 nm (visible region) and 850 nm (NIR region), indicating unique plasmonic behavior. To further validate the LSPR characteristics of NPS with anisotropic crystal structures, we also synthesized bulk PtSn intermetallic compound and examined its optical and physical properties. Additionally, we confirmed the dual LSPR peaks of B8₁-PtSn NPs through quantitative chemical calculations.