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. 2021 Dec 21;12(1):1. doi: 10.3390/bios12010001

Figure 2.

Figure 2

(A) Schematic illustrations of the fabrication process and images of the stretchable pH sensor with serpentine interconnects: (a) Polyimide (PI) layer fixed on Ecoflex substrate via silanization, (b) laser carbonization of carbon traces, (c) PANI coating of the carbon traces, (d) PI laser treatment, (e) excess PI removal, (f) Ecoflex insulation of the interconnects and Ag/AgCl and solid electrolyte deposition, (g) photograph of various stretchable PANI/C-PI interconnect designs, (h–j) images illustrating pH sensors being stretched. Reprinted (adapted) with permission from Reference [71] Copyright 2021 American Chemical Society. (B) Flexible wireless wound pH monitoring system using NFC communication. Left: The image presenting wireless NFC module. Reprinted (adapted) with permission from Reference [10]. Copyright 2021 Elsevier. (C) The schematic representation of a smart bandage assembly used for pH monitoring. Adapted from Reference [72].