Abstract
Three-dimensional (3D) graphene oxide/MXene (GO/MX) composite aerogels with characters of lightweight, porous structure, and superior elasticity have attracted great attention in electromagnetic shielding, oil-water separation, and chemical catalysis, especially smart electronic sensors. However, due to the lack of adequate interaction force between GO and MX nanosheets, it is challenging to construct a high strength and long-range ordered GO/MX aerogel, resulting in inferior mechanical properties and poor conductivity. Here, a facile gelation strategy is developed to form long-range ordered GO/MX aerogel by ethylenediamine (EDA) induced self-assembly of MX and GO liquid crystals (LCs). In this system, EDA plays dual roles of inducing ordered self-assembly of GO LCs nanosheets and strengthening interaction between GO and MX nanosheets. As a result, the obtained GO/MX aemgel with long-range ordered microstructure presents an outstanding mechanical elasticity of 9.5 kPa and a high conductivity of 0.99 S m(-1). Especially, the assembled GO/MX-based sensor has an extremely low detection limit of - 0.2% strain, prominent physiological signal capture capability, and excellent durability over 10,000 compression/release cycles. This work paves the way for the potential applications of GO/MX composite aerogel in real-time human motion monitor, artificial skins, and flexible smart devices.

Keywords Plus：GRAPHENE OXIDENETWORKFIBERS

Published in APPLIED SURFACE SCIENCE，Volume 566；10.1016/j.apsusc.2021.150719，NOV 15 2021