Figure 1

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(A) Picture of a patterned AgNWs layer deposited on a hydrophobic PTFE filter membrane. Six 1.5 mm diameter circular spots are arranged with a radial bicycle spokes-like geometry. The AgNWs linear components have lengths of 2 mm and widths of 0.5 mm, respectively. (B) Schematic representation of a wearable SERS-active chip. The AgNWs@PTFE substrate is “sandwiched” between biocompatible and adhesive TegadermTM and Leukomed® T tapes. Both PTFE membrane and Leukomed® T tape are drilled in the centre in order to obtain an hole with a diameter of 2 mm that allows the direct flow of sweat from the skin to the hydrophilic AgNWs on top of PTFE. The TegadermTM tape instead acts as transparent and protective layer of the entire chip.

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