Fig. 2: Characterization of the porous graphene foam in response to the temperature gradient and tensile strain. | Nature Communications

Fig. 2: Characterization of the porous graphene foam in response to the temperature gradient and tensile strain.

From: Thermoelectric porous laser-induced graphene-based strain-temperature decoupling and self-powered sensing

Fig. 2

a Schematic showing the experimental setup for the measurements (ΔT = T1-T2). b I–V curves of the sensor in response to a thermal gradient ΔT = 0, 1, 3, 6, 9, 12, and 15 °C. c The change in the thermoelectric voltage with ΔT in the range from 1 to 15 °C and its (d) linear fit to determine the Seebeck coefficient. e Output response signal of a device to a biased minimum temperature gradient of 0.5 °C. f I–V curves of the sensor in response to tensile strain from 0 to 45%. Relative resistance variation as a function of (g) time and (h) strain for a tensile strain in the range of 5 to 45%, with the gauge factor (GF) labeled in the plot. The standard deviation (SD) is shown as error bars (n = 3). i Relative resistance variation of the sensor under subtle strain levels of 0.05, 0.1, 0.2, 0.4, and 0.8%.

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