Plasmon-Enhanced Ultrasensitive Surface Analysis Using Ag Nanoantenna.
Chao-Yu LiJin-Hong GaoJun YiXia-Guang ZhangXiao-Dan CaoMeng MengChen WangYa-Ping HuangSan-Jun ZhangDe-Yin WuChuan-Liu WuJian-Hua XuZhong-Qun TianJian-Feng LiPublished in: Analytical chemistry (2018)
Raman scattering and fluorescence spectroscopy permeate analytic science and are featured in the plasmon-enhanced spectroscopy (PES) family. However, the modest enhancement of plasmon-enhanced fluorescence (PEF) significantly limits the sensitivity in surface analysis and material characterization. Herein, we report a Ag nanoantenna platform, which simultaneously fulfills very strong emission (an optimum average enhancement of 105-fold) and an ultrafast emission rate (∼280-fold) in PES. For applications in surface science, this platform has been examined with a diverse array of fluorophores. Meanwhile, we utilized a finite-element method (FEM) and time-dependent density functional theory (TD-DFT) to comprehensively investigate the mechanism of largely enhanced radiative decay. PES with a shell-isolated Ag nanoantenna will open a wealth of advanced scenarios for ultrasensitive surface analysis.
Keyphrases
- raman spectroscopy
- quantum dots
- energy transfer
- density functional theory
- single molecule
- high resolution
- high throughput
- gold nanoparticles
- molecular dynamics
- finite element
- solid state
- climate change
- highly efficient
- mass spectrometry
- molecular docking
- molecularly imprinted
- liquid chromatography
- tandem mass spectrometry