Fig. 2 Temperature-sensing properties of the flexible rGO/PVDF nanocomposite film. Temperature-sensing properties of the flexible rGO/PVDF nanocomposite.

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Fig. 2 Temperature-sensing properties of the flexible rGO/PVDF nanocomposite film. Temperature-sensing properties of the flexible rGO/PVDF nanocomposite film. (A) Cross-sectional SEM image of the rGO/PVDF composite film with stacked GO sheets. Scale bar, 1 μm. The inset shows a photograph of a flexible and large-scale (20 × 15 cm2) rGO/PVDF composite film. (B) Current-voltage curves of 1 wt % rGO/PVDF composite films at various temperatures. (C) Relative resistance change of rGO/PVDF composite film as a function of temperature for various concentrations of rGO. (D) Detection of temperature distribution on the human palm. (Top) Schematic diagram of a sensor array, where the rGO/PVDF composite film is sandwiched between gold electrode arrays (18 × 12 pixels). (Middle) Photograph of a human hand on top of the sensor array. (Bottom) Contour mapping of electrical resistance variations for the local temperature distribution on the human palm. (E) A representative photograph and infrared (IR) camera images of water droplets with different droplet temperatures (64° to −2°C) on the e-skins. (F and H) Relative resistance (R/R0) and temperature (T) variations of the e-skins after contact with water droplets (F) above room temperature (25° to 64°C) and (H) below room temperature (−2° to 21°C). Temperature (T) change is measured by an IR camera. (G and I) Initial stages of time-domain signals in (F) and (H) showing the variation of relative resistance immediately after contact between e-skins and water droplets. The solid lines represent a fit derived from Eq. 1. Jonghwa Park et al. Sci Adv 2015;1:e1500661 Copyright © 2015, The Authors