posted on 2022-06-01, 19:38authored byXueqin Chen, Yan Gao, Jiayin Zhan, Qing Xia, Zixuan Chen, Jun-Jie Zhu
Raman
spectroscopy facilitates the study of reacting molecules
on single nanomaterials. In recent years, the temporal resolution
of Raman spectral measurement has been remarkably reduced to the millisecond
level. However, the classic scan-based imaging mode limits the application
in the dynamical study of reactions at multiple nanostructures. In
this paper, we propose a spatiotemporal-resolved Raman spectroscopy
(STRS) technology to achieve fast (∼40 ms) and high spatial
resolution (∼300 nm) hyperspectral Raman imaging of single
nanostructures. With benefits of the outstanding electromagnetic field
enhancement factor by surface plasmon resonance (∼1012) and the snapshot hyperspectral imaging strategy, we demonstrate
the observation of stepwise Raman signals from single-particle plasmon-assisted
reactions. Results reveal that the reaction kinetics is strongly affected
by not only the surface plasmon-polariton generation but also the
density of Raman molecules. In consideration of the spatiotemporal
resolving capability of STRS, we anticipate that it provides a potential
platform for further extending the application of Raman spectroscopy
methods in the dynamic study of 1D or 2D nanostructures.