Microstructure Dictating Performance:Assembly of Graphene-Based Macroscopic Structures  

作　　者：Mingxin Li Jie Lian 

机构地区：[1]Department of Mechanical,Aerospace and Nuclear Engineering,Rensselaer Polytechnic Institute,Troy,New York 12180,United States

出　　处：《Accounts of Materials Research》2021年第1期7-20,共14页材料研究述评（英文）

基　　金：This work was financially supported by the US National Science Foundation under the award of DMR 1742806.

摘　　要：CONSPECTUS:A wide range of groundbreaking advancements in electronics,photonics,nanocomposites,etc.,have been achieved in the past decades due to the favorable attributes of single-layer graphene,including its record-breaking thermal conductivity,charge carrier mobility,fracture strength,and Young’s modulus.However,the realization of the potentials of macroscale graphene assemblies has remained challenging.The difficulties mainly lie within manipulating graphene sheets into an orderly intermolecular orientation and controlling the macroscopic ordering of the graphitic domains.Controlling the formation of graphene macroscopic structures and eliminating defects on both the nano-and microscales meanwhile optimizing performance is no easy feat.To address these microstructural issues in macroscopic graphene assemblies,multiple chemical,thermal,and mechanical approaches have been developed with a goal of overall performance enhancement.Therefore,in this Account we provide a brief review of our contributions in the microstructure engineering of macroscale graphene assemblies with the focus on graphene fibers(GFs),graphene papers(GPs),and other graphene-based assemblies with graphene oxide(GO)colloids as precursors.Building upon the developments in wet chemistry on assembling individual GO sheets into macroscopic structures,we successfully intercalated large GO sheets with small GO sheets,which increased compactness for wet-spun GFs without disturbing the sheet orientation and alignment of the large GO sheets.Increasing GO compactness during wet assembly allows for the increase of thermal and electrical conductivities as well as the mechanical strength of GFs at a single stroke.A high degree of alignment of graphene sheets with abundant sp2 carbon atoms is also necessary for achieving high thermal and electrical conductivities in graphene assemblies.Fine control of GO sheet alignment and orientation during the wet-spinning assembly is demonstrated through the shape and size confinement of fluidic flow channels.Utilizin

关 键 词：CRYSTALLITE SPINNING BREAKING 

分 类 号：TB3[一般工业技术—材料科学与工程]