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. 2022 May 9;12(5):504. doi: 10.3390/membranes12050504

Figure 7.

Figure 7

(A) The fabrication of a microfluidic pH-sensing chip. Reprinted with permission from [47], Copyright (2014) Royal Society of Chemistry. (B) A CCD–based flexible pH sensor integrated with a temperature sensor. Reprinted with permission from [115], Copyright (2018) Spring Nature. (C–G) Graphene–tannin supramolecule–based wearable potentiometric pH sensors. (C) Molecular structure of tannin (TA). (D) A schematic of TA–RGO supramolecular aggregates based on their π-π conjugation interaction. (E) Photographs of TA–RGO on the skin to test adhesion. (F) The wearable pH device was fabricated by directly printing TA–RGO on a flexible substrate. (G) Real–time sweat test of the flexible pH sensor. Reprinted with permission from [116], Copyright (2022) Elsevier.