气凝胶
材料科学
MXenes公司
聚酰亚胺
纳米片
复合数
复合材料
热电效应
纳米技术
图层(电子)
热力学
物理
作者
Changcheng Jiang,Jiayun Chen,Xuejun Lai,Hongqiang Li,Xingrong Zeng,Yinan Zhao,Qingtao Zeng,Jiefeng Gao,Zhengzhong Wu,Yunkun Qiu
标识
DOI:10.1016/j.cej.2022.134630
摘要
Multifunctional smart fire-protection aerogels are urgently needed to meet the requirement of the Internet of Everything era. Herein, we fabricated a mechanically robust and high fire-safe polyimide/MXene composite aerogel (denoted as [email protected]) with sensitive temperature-sensing and fire-warning capability. Thanks to the unique thermoelectric effect and high electrical conductivity of the 2D transition metal carbide (MXene) nanosheet, [email protected] exhibited a linear relationship between the thermoelectric voltage and the temperature difference, showing sensitive temperature-sensing capability. When being burned, it could repeatedly trigger the fire-warning system in less than 5 s. More importantly, owing to the lamellar barrier and skeleton supporting effect of the MXene nanosheets, [email protected] exhibited excellent flame retardancy, which self-extinguished within 1 s after exposing to a flame for 60 s and whose peak heat release rate was significantly decreased by 78% compared with PI aerogel. Besides, [email protected] showed impressive thermal insulation, outstanding thermostability and durable piezoresistive sensing. This work provides a novel strategy to fabricate next-generation multifunctional fireproof aerogel, showing promising applications in intelligent robots, aerospace, and railway transportation.
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