拉曼散射
材料科学
八面体
拉曼光谱
立方晶系
领域(数学)
光学
纳米技术
分子物理学
结晶学
晶体结构
物理
化学
数学
纯数学
作者
Myeong Jin Oh,Soon Wook Kwon,Sungwoo Lee,Insub Jung,Sungho Park
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-02-28
卷期号:18 (10): 7656-7665
标识
DOI:10.1021/acsnano.4c00734
摘要
Here, we describe the synthesis of a plasmonic particle-in-a-frame architecture in which a solid Au octahedron is enclosed by a Au cubic nanoframe. The octahedra are positioned inside and surrounded by outer Au cubic nanoframes, creating intra-nanogaps within a single entity. Six sharp vertexes in the Au octahedra point toward the open (100) facets of the cubic nanoframes. This allows not only efficient interactions with the surroundings but also tip-enhanced electromagnetic near-field focusing at the sharp tips of the octahedra, combined with intraparticle coupling. The solid core-frame shell structure enhances near-field focusing, giving rise to a heightened concentration of "hot spots". This effect enables highly sensitive detection of 2-naphthalenethiol and thiram, indicating these substrates for use in surface-enhanced Raman spectroscopy-related applications.
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