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a–d SEM image of top view (a) and side view (b) of unstructured PDMS film, SEM image of top view (c), and side view (d) of microstructured PDMS film. e Comparison of the relative responses of the sensors with different structures. f Sensitivity testing of the two structured sensors. g The response of the two structured sensors under 1 Pa pressure. Adapted with permission from ref. 18. Copyright 2017 Elsevier
