Fig. 2

Various flexible temperature sensors based on carbon materials. a SEM images of a graphite-PDMS composite [67]. b The entire surface micrographs of PEO1500/PVDF/Gr [68]. c Schematic diagrams and scanning electron microscopy (SEM) images of cyberwood [76]. d SEM images of the CNT/PEDOT:PSS composite fibers with CNT contents of 40 wt% [75]. e SEM images of CrGO100 [54]. f The cross-section SEM image of GNWs on PDMS [86]