Fig. 3: Schematic preparation of cellulose-based CNT/TOCNFs conductive ink and the TWF flexible electronics.
From: Programmable and flexible wood-based origami electronics
a Schematic illustration of CNT/TOCNFs conductive ink and direct ink writing on the TWF surface. b Digital images of conductive ink printed on the surface of TWF. c, d Surface profile AFM images of TWF with and without printed with ink, respectively. e SEM morphologies of conduction ink on flexible electronic circuit observed from surface and cross-section, respectively. f Normalized sheet resistance variation of the TWF flexible circuit versus the number of folding−unfolding (180°) cycles. An inserted photograph of the TWF flexible circuit powering a LED. g Normalized relative resistance variation as a function of the number of foldings (90°). h The conductivity of the TWF electronics was measured at different relative humidity (RH) conditions. i The thermal infrared images of TWF and PET substrates heated at different temperatures (a range of 35−115 °C).
