Fig. 2
From: Chemically modified graphene films with tunable negative Poisson’s ratios
Typical mechanical response of chemically modified graphene films. a The transverse strain εX plotted as a function of the longitudinal strain εY of e-GO0 films under a tensile loading in the Y direction. The red line is the linear fitting line. b The instantaneous Poisson’s ratios of e-GO0 films averaged from three samples in Fig. S4b. c Poisson’s ratios of e-GO35 films (prepared by evaporation of GO solution synthesized at 35 °C), f-GO35 (prepared by filtration of GO solution synthesized at 35 °C), f-GO0 (prepared by filtration of GO solution synthesized at 0 °C), f-rGO0 (reduced f-GO0 films), e-GO0 and e-rGO0 (reduced e-GO0 films). d Poisson’s ratios of e-GO0 films under cyclic uniaxial tensile loading with a peak strain of 1.5%. The error bars in panels (b, c) indicate the standard errors (three samples were measured). Source data are provided as a Source Data file
