Multifunctional ultralight, recoverable, piezoresistive, and super thermal insulating SiC nanowire sponges
Multifunctional ultralight, recoverable, piezoresistive, and super thermal insulating SiC nanowire sponges
复制标题
多功能超轻、可恢复、压阻、超隔热SiC纳米线海绵
DOI：
10.1111/jace.18823
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Chen Y
近年来，超轻三维（3D）结构碳化硅（SiC）纳米线海绵具有可回收压缩性、出色的高温热稳定性和化学稳定性以及阻燃性等综合性能，受到了人们的积极追捧。然而，有效地构建具有良好控制的SiC纳米线整体形状和分布的SiC纳米线海绵仍然是一个挑战。本文将静电纺丝技术与碳热还原工艺相结合，通过对堆叠的静电纺丝PAN/ sio2纳米纤维膜进行热处理，开发了一种高孔、独立的三维SiC纳米线（SiCNW）海绵的制备新工艺。所得SiCNW海绵具有超低密度（~ 29 mg cm−3）、大压缩变形（高达40%应变）下优异的压缩恢复性和抗疲劳性，使其在各种复杂条件下具有优异的压阻传感能力。此外，海绵表现出极好的隔热性能（导热系数为24 mW m−1K−1）和阻燃性。我们相信，目前的工艺为其他多功能陶瓷海绵的开发提供了技术线索，并且这些超轻多功能陶瓷海绵的进一步开发为在恶劣工程环境中应用的先进部件的设计提供了潜力。
Ultralight three‐dimensional (3D) architectured silicon carbide (SiC) nanowire sponges with integrated properties of recoverable compressibility, outstanding high‐temperature thermal and chemical stability, and fire‐retardance have been actively pursued in recent years. However, efficient construction of SiC nanowire sponges with well‐controlled overall shapes and distribution of SiC nanowires remains challenging. Herein, by coupling the electrospinning technique and carbothermal reduction process, we have developed a new fabrication process for highly porous and free‐standing 3D SiC nanowire (SiCNW) sponges with closely attached nanowires through thermal treatment of stacked electrospun PAN/SiO2nanofiber membranes. The resulting SiCNW sponges possess ultralow density (∼29 mg cm−3), excellent compressive recoverability from large compressive deformation (up to 40% strain), and fatigue resistance, which endow them with excellent piezoresistive sensing capability under a variety of complex conditions. Furthermore, the sponges display superb thermal insulation (thermal conductivity of 24 mW m−1K−1) and fire‐retardance. We believe that the present process provides technical clues for the development of other multifunctional ceramic sponges, and that further development of these ultralight multifunctional ceramic sponges offers potential for the design of advanced components for application in harsh engineering environments.