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. Author manuscript; available in PMC: 2020 Nov 15.
Published in final edited form as: Anal Chim Acta. 2019 Jul 9;1082:98–105. doi: 10.1016/j.aca.2019.07.015

Figure 1.

Figure 1.

A) SEM image of untreated cotton thread and schematic of silane functionalization for hydrophobic surface modification. B) Hydrophobic thread spray setup, a single piece of thread with pre-deposited sample is placed in a glass capillary and a suitable solvent applied. The inset shows Taylor cone formation, after application of onset voltage (3 kV).