Humidity response of a capacitive sensor based on auxeticity of carbon nanotube-paper composites

Abstract Auxetic materials showing a negative Poisson’s ratio can offer unusual sensing capabilities due to drastic percolation changes. This study presents the capacitive response of wet-fractured carbon nanotube paper composites in exposure humidity. A strained composite strip is fractured produce numerous cantilevers consisting cellulose fibers coated with nanotubes. During stretching, thin buckles out-of-plane direction, which causes auxetic behavior generate radially structured electrodes. The crossbar junctions forming among electrodes significantly increase capacitance and its humidity as function sensor widths. molecular switch electric characteristics between predominantly resistive- elements. resulting characterized for without need an additional absorption medium. normalized change (ΔC/C 0 ) exhibits sensitivity 0.225 within range 40 ∼ 80% relative novel water-printed paper-based nanocomposite paves way inexpensive sweat sensors.