Figure 1.

Examples of bandages with integrated pH sensors. (a) Schematic view of the fabrication process of highly stretchable potentiometric pH sensors. (b) Photograph of a typical bandage with integrated pH sensor placed on a curved surface demonstrating its stretchability and flexibility. (c) Real-time monitoring of the pH and the sensor response to pH changes under various mechanical strains showing negligible effect of strain on the sensor readout. (d) A colorimetric pH sensor based hydrogels carrying beads loaded with pH-sensitive dye for long-term monitoring of wound. (e) Images demonstrating color changes in of pH sensitive dressings on the pig skin when sprayed with solutions of different pH values. (f) The data extracted from the images taken using a smartphone in comparison to the actual pH values of the sprayed solutions. Figures are reproduced with permission from [39], [40].