重量轻,薄度,透明度,灵活性,绝缘是柔性电子器件基板的关键指标。常见的柔性基板通常是聚合物材料,但是它们的回收是一个压倒性的挑战。同时,纸基材由于其较差的机械和热稳定性而在实际应用中受到限制。然而,天然生物材料由于其有机-无机多尺度结构而具有优异的机械性能和多功能性,这激发了我们设计有机-无机纳米复合薄膜的灵感。为此,使用具有丰富亲水性官能团的纤维素纳米纤维来开发生物启发的多尺度膜以帮助分散羟基磷灰石纳米线。生物可持续薄膜的厚度仅为40μm,它具有独特的机械性能(强度:52.8MPa;韧性:0.88MJm-3)和优异的光学性能(透光率:80.0%;雾度:71.2%)。因此,这种薄膜作为柔性传感器的基底是最佳的,它可以通过无线蓝牙传输电容和电阻信号,对压力和湿度表现出超敏的反应(例如,以5000%的信号变化响应手指按压和以4000%的信号变化呼出的水蒸气)。因此,仿生多尺度有机-无机复合膜的综合性能在柔性电子器件中具有突出的前景,食品包装,塑料替代。
Light weight, thinness, transparency, flexibility, and insulation are the key indicators for flexible electronic device substrates. The common flexible substrates are usually polymer materials, but their recycling is an overwhelming challenge. Meanwhile, paper substrates are limited in practical applications because of their poor mechanical and thermal stability. However, natural biomaterials have excellent mechanical properties and versatility thanks to their organic-inorganic multiscale structures, which inspired us to design an organic-inorganic nanocomposite film. For this purpose, a bio-inspired multiscale film was developed using cellulose nanofibers with abundant hydrophilic functional groups to assist in dispersing hydroxyapatite nanowires. The thickness of the biosustainable film is only 40 μm, and it incorporates distinctive mechanical properties (strength: 52.8 MPa; toughness: 0.88 MJ m-3) and excellent optical properties (transmittance: 80.0%; haze: 71.2%). Consequently, this film is optimal as a substrate employed for flexible sensors, which can transmit capacitance and resistance signals through wireless Bluetooth, showing an ultrasensitive response to pressure and humidity (for example, responding to finger pressing with 5000% signal change and exhaled water vapor with 4000% signal change). Therefore, the comprehensive performance of the biomimetic multiscale organic-inorganic composite film confers a prominent prospect in flexible electronics devices, food packaging, and plastic substitution.