posted on 2024-02-28, 14:51authored byMyeong
Jin Oh, Sunwoo Kwon, Sungwoo Lee, Insub Jung, Sungho Park
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.