Fig. 2: Properties and micromorphology of the MW-CNT and PDMS films.

a The \({\boldsymbol{S}}\) curve of sensors for different weight ratios in the MW-CNT/PDMS films; b the microscopic morphologies of sensing films MW-CNT and PDMS with weight ratios of 0.05:1, 0.2:1, and 0.3:1; all the scales of SEM images are set to 5 μm; c the schematic microscopic morphologies corresponding to the current variations of sensing films with and without applied pressure; d the comparison results of the \({\boldsymbol{S}}\) curve and pressure sensing range of the reported flexible microstructure piezoresistive sensors^{35,44,45,46,47,48}