Laser tuned field emission of the carbon nanotube arrays grown on an optical fiber  

作　　者：WEI XianQi LI Xin LIU WeiHua WANG XiaoLi 

机构地区：[1]School of Science, Xi'an Jiaotong University [2]Department of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University

出　　处：《Science China(Technological Sciences)》2014年第10期1936-1940,共5页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.91123018,61172041,61172040,50975226,and 60801022);the National Hi-Tech Research and Development Program of China("863"Project)(Grant No.2008AA03A314);the Fundamental Research Funds for the Central Universities

摘　　要：Laser was coupled into an optical fiber,on which covered a layer of well-aligned carbon nanotubes(CNTs)serving as cathode,to tune the field emission of the cathode.CNT arrays as field emission cathode were synthesized by chemical vapor deposition(CVD)on a naked fiber core.When the laser was coupled into the fiber,the turn-on voltage(Vto at a current density of 1 mA cm?2)decreased from 1.0 to 0.9 kV and the emission current density increased from 0.83 mA cm?2(at a 1 kV bias voltage)to3.04 mA cm?2 on 40μm diameter fiber.A photon absorption mechanism is attributed to the field emission improvement.The estimated effective work function of CNT arrays on the optical fiber decrease from 4.89 to 4.29 eV.The results show the possibility of constructing a waveguide type laser modulated field emission cathode.

关 键 词：LASER field emission carbon nanotubes optical fiber 

分 类 号：TB383.1[一般工业技术—材料科学与工程]