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. Author manuscript; available in PMC: 2022 Jun 1.
Published in final edited form as: Adv Mater. 2021 Apr 30;33(23):e2006582. doi: 10.1002/adma.202006582

Figure 3: Thin Hydrogel Films –

Figure 3:

a| Engineered hydrogel films incorporating silver particles for pH sensing. Adapted with permission [116]. Copyright 2008, Wiley. b| Gelatin-based holographic films with swelling-shrinking shifts in wavelength and color. Adapted under the terms of CC BY License [71]. Copyright 2016, the authors. c| Thin-Film holographic sensors with phenylboronic modifications for glucose and another analyte sensing. Reproduced with permission from reference [60]. Copyright 2014, American Chemical Society. d| Block co-polymer hydrogels with varying hydration levels respond to proximity to the human finger as touchless response platforms. Adapted under the terms of CC-BY-NC license [115]. Copyright 2020, the authors.