MXenes公司
材料科学
石墨烯
导电体
超级电容器
纳米复合材料
多孔性
电磁屏蔽
氧化物
纳米技术
电阻率和电导率
复合材料
电容
电极
工程类
物理化学
化学
冶金
电气工程
作者
Sai Zhao,Haobin Zhang,Jiaqi Luo,Qiwei Wang,Bin Xu,Song Hong,Zhong‐Zhen Yu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-10-19
卷期号:12 (11): 11193-11202
被引量:726
标识
DOI:10.1021/acsnano.8b05739
摘要
Two-dimensional transition-metal carbides/carbonitrides (MXenes) with both superb electrical conductivity and hydrophilicity are promising for fabricating multifunctional nanomaterials and nanocomposites. However, the construction of three-dimensional (3D) and lightweight MXene macroscopic assemblies with excellent electrical conductivity and mechanical performances has not been realized due to the weak gelation capability of MXene sheets. Herein, we demonstrate an efficient approach for constructing highly conductive 3D Ti3C2T x porous architectures by graphene oxide assisted hydrothermal assembly followed by directional freezing and freeze-drying. The resultant hybrid aerogels exhibit aligned cellular microstructure, in which the graphene sheets serve as the inner skeleton, while the compactly attached Ti3C2T x sheets present as shells of the cell walls. The porous and highly conductive architecture (up to 1085 S m-1) is highly efficient in endowing epoxy nanocomposite with a high electrical conductivity of 695.9 S m-1 and an outstanding electromagnetic interference (EMI)-shielding effectiveness of more than 50 dB in the X-band at a low Ti3C2T x content of 0.74 vol %, which are the best results for polymer nanocomposites with similar loadings of MXene so far. The successful assembly methodology of 3D and porous architectures of Ti3C2T x would greatly widen the practical applications of MXenes in the fields of EMI shielding, supercapacitors, and sensors.
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