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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 5.

Figure 5.

VF-PC-SERS specificity demonstration. (a) VF-PC-SERS test strip after collection in a chamber loaded with 5 mg R6G mixed with 1 g lactose, scale bar 5 mm; (b) The same VF-PC-SERS test strip after elution by methanol, exhibiting separation of lactose and R6G. The direction of solvent flow during PC, the boundary of the vacuum collection region, and the location of the solvent front are annotated, scale bar 5 mm; (c) Photograph illustrating relative amounts of R6G and diluents used in specificity experiments.