高等学校化学学报2024，Vol.45Issue(6)：103-110,8.DOI:10.7503/cjcu20240022
Au纳米粒子二聚体-Au片耦合体系"热点"的尺寸效应
Size Effect on"Hot Spot"of Au Nanoparticle Dimer-Au Plate Coupling System
摘要
Abstract
The"hot spot"effect has attracted considerable attention in surface enhanced spectroscopy and relevant fields,especially for the controllable fabrication of the dynamic"hot spot"by using the size and excitation wavelength dependent transfer effect.Herein,the coupling system of spherical dimer of gold nanoparticles and gold plate is theoretically simulated by finite element method(FEM),and the effects of excitation wavelengths and nanoparticle sizes on the electromagnetic field enhancement at different gaps of the system are systematically investigated.The results demonstrated that the two modes of surface plasmon resonance were observed.As the size of nanoparticle is 30 nm and the excitation wavelength is 450-535 nm and 670-950 nm,the two plasmon resonance modes were mainly dominated by a cooperative effect,and"hot spot"mainly located in the particle-particle gap.As the size of nanoparticles was increased to 85 nm or even 105 nm,a competition effect between the two plasmon resonance modes was occurred for the excitation wavelengths of 670-695 nm and 725-755 nm.It resulted in the transformation of"hot spot"from particle-particle gap to particles-gold plate gap successfully.It was anticipated that the theoretical simulation provided an alternative approach for control and transfer on the"hot spot"and it was beneficial to design and fabricate the substrate with high performance of surface enhanced optical effect.关键词
"热点"/表面等离极化激元/金纳米粒子二聚体/竞争效应/转移效应Key words
"Hot spots"/Surface plasmon polariton/Au nanoparticle dimer/Competition effect/Transfer effect分类
化学化工引用本文复制引用
曾自强,张晨杰,徐敏敏,姚建林..Au纳米粒子二聚体-Au片耦合体系"热点"的尺寸效应[J].高等学校化学学报,2024,45(6):103-110,8.基金项目
国家自然科学基金(批准号:22172109,211773166)资助. Supported by the National Natural Science Foundation of China(Nos.22172109,211773166). （批准号:22172109,211773166）
