Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8754-8763. doi: 10.1021/acsami.0c21392. Epub 2021 Feb 16.
For sustainability and environmental friendliness, the renewable biomaterials including cellulose have been widely used in flexible electronics, such as pressure sensors. Herein, the carbonized bacterial nanocellulose with excellent conductivity and wood-derived cellulose nanofibrils are combined to prepare the aerogel through directional ice-templating and freeze-drying. The obtained composite aerogel, which has a porous structure and aligned channels, is further employed as an active layer to prepare the resistive-type pressure sensor on a paper substrate. This pressure sensor exhibits remarkable flexibility, fast response, reliability, and especially adjustable sensitivity in a wide pressure range (0-100 kPa). In addition, the sensor's working mechanism and potential applications, such as motion detection, footstep recognition, and communication with smartphones via Bluetooth, are also well demonstrated. Moreover, this work provides novel insights into the development of green pressure sensors and the utilization of sustainable natural biomaterials in high-tech fields.
为了实现可持续发展和环境友好，包括纤维素在内的可再生生物材料已被广泛应用于柔性电子领域，例如压力传感器。在此，我们将具有优异导电性的碳化细菌纳米纤维素与木质素衍生的纤维素纳米纤维结合，通过定向冰模板和冷冻干燥制备气凝胶。所得到的复合气凝胶具有多孔结构和定向通道，进一步被用作活性层，在纸基底上制备电阻式压力传感器。这种压力传感器具有出色的柔韧性、快速响应、可靠性，特别是在较宽的压力范围内（0-100kPa）可调节的灵敏度。此外，我们还展示了传感器的工作机制以及其在运动检测、脚步识别和通过蓝牙与智能手机通信等潜在应用。此外，这项工作为绿色压力传感器的发展以及可持续天然生物材料在高科技领域的应用提供了新的思路。
