Qin Zhen, Wang Ziwen, Li Dan, Lv Yuhuan, Zhao Biao, Pan Kai
College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Appl Mater Interfaces. 2024 Jun 26;16(25):32554-32565. doi: 10.1021/acsami.3c19462. Epub 2024 Jun 12.
The assembly of two-dimensional (2D) nanomaterials into a three-dimensional (3D) aerogel can effectively prevent the problem of restacking. Here, nanofiber-reinforced MXene/reduced graphene oxide (rGO) conductive aerogel is prepared via the hydrothermal reduction of GO using pyrrole and in situ composite with MXene. Combined with low-content 2D conductive nanosheets (MXene and rGO) as "brick", conductive polypyrrole as "mortar", and one-dimensional (1D) nanofiber as "rebar", a strong interfacial cross-linking of MXene and rGO nanosheets is realized through covalent and noncovalent bonds to synergistically improve its mechanical performance. Based on the prepared MXene/rGO aerogel, a high-performance piezoresistive sensor with a sensitivity of up to 20.80 kPa in a wide pressure range of 15.6 kPa is obtained, and it can withstand more than 5000 cyclic compressions. Besides, the sensor shows a stable output and can be applied to monitor various human motion signals. In addition, an all-solid-state supercapacitor electrode is also fabricated, which shows a high area-specific capacitance of up to 274 mF/cm at a current density of 1 mA/cm.
将二维（2D）纳米材料组装成三维（3D）气凝胶可以有效防止重新堆叠的问题。在此，通过使用吡咯对氧化石墨烯（GO）进行水热还原并与MXene原位复合，制备了纳米纤维增强的MXene/还原氧化石墨烯（rGO）导电气凝胶。以低含量的二维导电纳米片（MXene和rGO）作为“砖块”、导电聚吡咯作为“灰浆”以及一维（1D）纳米纤维作为“钢筋”，通过共价键和非共价键实现了MXene和rGO纳米片之间的强界面交联，从而协同提高其机械性能。基于所制备的MXene/rGO气凝胶，获得了一种高性能压阻式传感器，在15.6 kPa的宽压力范围内灵敏度高达20.80 kPa，并且能够承受超过5000次循环压缩。此外，该传感器输出稳定，可用于监测各种人体运动信号。此外，还制备了一种全固态超级电容器电极，在1 mA/cm的电流密度下，其面积比电容高达274 mF/cm 。
