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. Author manuscript; available in PMC: 2020 Oct 15.
Published in final edited form as: Sens Actuators B Chem. 2019 Jul 2;297:126765. doi: 10.1016/j.snb.2019.126765

Figure 1.

Figure 1.

Overview of VF-SERS system. (a) Nanopaper synthesis, with SEM images of nanopaper morphology (scale bars = 3 μm); (b) Nanopaper is used as a filter to collect particulates from the air; (c) simple and rapid on-filter separation enables identification of filtered chemical species.