Interlayer engineering in 3D graphene skeleton realizing tunable electronic properties at a highly controllable level for piezoresistive sensors  

作　　者：Xunxiang Hu Lingling Tan Xianzhang Wu Jinqing Wang 

机构地区：[1]College of Material Science and Engineering,Hunan Province Key Laboratory of Materials Surface&Interface Science and Technology,Central South University of Forestry and Technology,Changsha 410004,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2023年第7期8512-8521,共10页纳米研究（英文版）

基　　金：This work was funded by the National Natural Science Foundation of China(No.52103247);the Scientific Research Project of Hunan Provincial Department of Education(No.21B0264);the Natural Science Foundation of Hunan Province(No.2022JJ40877).

摘　　要：Three-dimensional(3D)graphene is a promising active component for various engineering fields,but its performance is limited by the hidebound electrical conductivity levels and hindered electrical transport.Here we present a novel approach based on interlayer engineering,in which graphene oxide(GO)nanosheets are covalently functionalized with varied molecular lengths of diamine molecules.This has led to the creation of an unprecedented class of 3D graphene with highly adjustable electronic properties.Theoretical calculations and experimental results demonstrate that ethylenediamine,with its small diameter acting as a molecular bridge for facilitating electron transport,has the potential to significantly improve the electrical conductivity of 3D graphene.In contrast,butylene diamine,with its larger diameter,has a reverse effect due to the enlarged spacing of the graphene interlayers,resulting in conductive degradation.More importantly,the moderate conductive level of 3D graphene can be achieved by combining the interlayer spacing expansion effect and theπ-electronic donor ability of aromatic amines.The resulting 3D graphene exhibits highly tunable electronic properties,which can be easily adjusted in a wide range of 2.56-6.61 S·cm^(-1)compared to pristine GO foam(4.20 S·cm^(-1)).This opens up new possibilities for its use as an active material in a piezoresistive sensor,as it offers remarkable monitoring abilities.

关 键 词：GRAPHENE tunable electronic properties multifunctional composites piezoresistive sensor 

分 类 号：TB383[一般工业技术—材料科学与工程]