With
the increasing emphasis on atmospheric environmental protection,
it is crucial to find an efficient, direct, and accurate method to
identify pollutant species in the atmosphere. To solve this problem,
we designed and prepared the cascade multicavity (CMC) structure composed
with silver nanoparticles (Ag NPs) as a surface-enhanced Raman scattering
(SERS) substrate with favorable light transmittance and flexibility.
The multicavity structure distributed on the surface introducing the
homogeneous connecting holes endows the structure to more fully utilize
the incident light while slowing the gas movement rate. Theoretical
and experimental results have demonstrated that the Ag NPs/cascade
multicavity (Ag–CMC) SERS substrate is a highly sensitive SERS
substrate that can be used for in situ detection
of gases under non-perpendicularly incident laser irradiation or bending
of the substrate. We believe that the SERS substrate can provide a
more efficient and feasible way for in situ detection
of gaseous pollutants.