Key Laboratory of Analytical Chemistry for Consumer Products, Chinese Academy of Inspection and Quarantine, Beijing 100176, P. R. China.
School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, P. R. China.
Anal Chem. 2022 Oct 25;94(42):14635-14641. doi: 10.1021/acs.analchem.2c02691. Epub 2022 Oct 14.
The construction of open hot-spot structures that facilitate the entry of analytes is crucial for surface-enhanced Raman spectroscopy. Here, metallic niobium nitride (NbN) three-dimensional (3D) hierarchical networks with open nanocavity structure are first found to exhibit a strong visible-light localized surface plasmon resonance (LSPR) effect and extraordinary surface-enhanced Raman scattering (SERS) performance. The unique nanocavity structure allows easy entry of molecules, promoting the utilization of electromagnetic hot spots. The NbN substrate has a lowest detection limit of 1.0 × 10 M and a Raman enhancement factor (EF) of 1.4 × 10 for contaminants. Furthermore, the NbN hierarchical networks possess outstanding environmental durability, high signal reproducibility, and detection universality. The remarkable SERS sensitivity of the NbN substrate can be attributed to the joint effect of LSPR and interfacial charge transport (CT).
构建有利于分析物进入的开放热点结构对于表面增强拉曼光谱学至关重要。在这里，首次发现具有开放纳米腔结构的金属氮化铌（NbN）三维（3D）分级网络表现出强烈的可见光局域表面等离子体共振（LSPR）效应和非凡的表面增强拉曼散射（SERS）性能。独特的纳米腔结构允许分子轻松进入，促进了电磁热点的利用。NbN 衬底对污染物的最低检测限为 1.0×10M，拉曼增强因子（EF）为 1.4×10。此外，NbN 分级网络具有出色的环境耐久性、高信号重现性和检测通用性。NbN 衬底的显著 SERS 灵敏度可归因于 LSPR 和界面电荷传输（CT）的共同作用。
