Fabrication of a three-dimensional micro/nanocarbon structure with sub-10 nm carbon fiber arrays based on the nanoforming and pyrolysis of polyacrylonitrile-based jet fibers  

作　　者：Jufeng Deng Chong Liu Dian Song Marc Madou 

机构地区：[1]Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education,Guizhou University,Guiyang,China [2]School of Mechanical Engineering,Dalian University of Technology,Dalian,China [3]Chemical and Biomolecular Engineering,University of California,Irvine,USA [4]Mechanical and Aerospace Engineering,University of California,Irvine,USA [5]School of Engineering and Science,Tecnologico de Monterrey,Monterrey,Mexico

出　　处：《Microsystems & Nanoengineering》2023年第5期333-343,共11页微系统与纳米工程（英文）

基　　金：supported by the Natural Science Special(Special Post)Research Foundation of Guizhou University[Grant No.2023-038];Guizhou Provincial Science and Technology Projects(No.PTRC[2020]6007-2).

摘　　要：To produce a three-dimensional micro/nanocarbon structure,a manufacturing design technique for sub-10 nm carbon fiber arrays on three-dimensional carbon micropillars has been developed;the method involves initiating electrostatic jetting,forming submicron-to-nanoscale PAN-based fibers,and maximizing the shrinkage from polyacrylonitrile(PAN)-based fibers to carbon fibers.Nanoforming and nanodepositing methods for polyacrylonitrilebased jet fibers as precursors of carbon fibers are proposed for the processing design of electrostatic jet initiation and for the forming design of submicron-to-nanoscale PAN-based fibers by establishing and analyzing mathematical models that include the diameter and tensile stress values of jet fibers and the electric field intensity values on the surfaces of carbon micropillars.In accordance with these methods,an array of jet fibers with diameters of~80 nm is experimentally formed based on the thinning of the electrospinning fluid on top of a dispensing needle,the poking of drum into an electrospinning droplet,and the controlling of the needle–drum distance.When converting thin PANbased jet fibers to carbon fibers,a pyrolysis method consisting of the suspension of jet nanofibers between carbon micropillars,the bond between the fibers and the surface of the carbon micropillar,and the control of micropillar spacing,stabilization temperature,and carbonation rate is presented to maximize the shrinkage from PAN-based fibers to carbon fibers and to form sub-10 nm carbon fiber arrays between three-dimensional carbon micropillars.The manufacturing design of a three-dimensional micro/nanocarbon structure can produce thin PAN-based jet nanofibers and nanofiber arrays aligned on micropillar surfaces,obtain shrinkage levels reaching 96%and incorporate sub-10 nm carbon fibers into three-dimensional carbon micropillars;these actions provide new research opportunities for correlated three-dimensional micro/nanocarbon structures that have not previously been technically possible.

关 键 词：fibers fiber carbon 

分 类 号：TB383[一般工业技术—材料科学与工程]