Development of a flexible and highly sensitive pressure sensor based on an aramid nanofiber-reinforced bacterial cellulose nanocomposite membrane
Development of a flexible and highly sensitive pressure sensor based on an aramid nanofiber-reinforced bacterial cellulose nanocomposite membrane
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DOI：
10.1016/j.cej.2021.131980
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发表时间：
2021-12-15
影响因子：
15.1
通讯作者：
Chen, Lei
中科院分区：
文献类型：
--
作者：
Chen, Shiqiang;Wang, Yidi;Chen, Lei
可穿戴式电子传感器，特别是压阻式压力传感器，由于其便携性、灵活性和对压力的微小变化的高灵敏度而引起了极大的关注。然而，这些传感器受到制造过程以及差的机械性能、压力敏感性的影响。采用真空过滤自组装法制备了芳纶纤维素（ANF）增强细菌纤维素（BC）纳米复合膜（ANFs@BC）。与未处理的BC相比，所得ANFs@BC的拉伸强度从36.3 MPa增加到58.3 MPa，对应于60.6%的增加，这表明ANFs增强了BC膜的结构。采用银纳米线（Ag NW）对柔韧、坚固的ANF @ BC进行进一步修饰，制备了Ag/ANF @BC，并将其用作压力传感器。所制备的压力传感器具有良好的抑菌性能、较高的压力灵敏度和良好的长期稳定性，在5 kPa恒压6000 s后，传感器的灵敏度没有明显下降。当应用于人体时，压力传感器能够准确地识别不同的机械刺激，这突出了传感器用于人体运动监测的前景。本工作为制备具有较强力学性能的ANFs@BC提供了一条新的有效途径。此外，Ag/ANFs@BC作为压力传感器在可穿戴电子产品中具有很大的应用价值。
Wearable electronic sensors, especially piezoresistive pressure sensors, have attracted tremendous attention due to their portability, flexibility, and high sensitivity to slight changes in pressure. However, these sensors suffer from fabrication procedures as well as poor mechanical properties, pressure sensitivity. Herein, an aramid nanofiber (ANF)-reinforced bacterial cellulose (BC) nanocomposite membrane (ANFs@BC) was prepared by a simple vacuum-filtration self-assembly process. Compared to the untreated BC, the tensile strength of the resulting ANFs@BC increased from 36.3 to 58.3 MPa, corresponding to a 60.6% increase, which indicated that the ANFs reinforced the structure of the BC membrane. The flexible and strong ANFs@BC was further modified by silver nanowires (Ag NWs) to prepare the Ag/ANFs@BC, which was used as the pressure sensor. The prepared pressure sensor exhibited suitable antibacterial properties, high pressure sensitivity and remarkable long-term stability without any distinct decline in sensitivity, after a constant applied pressure of 5 kPa for 6000s. When being applied to the human body, the pressure sensor was capable of accurately recognizing different mechanical stimuli, which highlighted the promising potential of the sensor for use in human motion monitoring. This work provided a novel and efficient pathway to prepare the ANFs@BC with powerful mechanical properties. Besides, the Ag/ANFs@BC as the pressure sensor exhibited great value for use in wearable electronics.