尖锐端头碳纳米管的制备与场发射特性(英文)  

Synthesis and field emission property of carbon nanotubes with sharp tips

作　　者：张艳丽[1] 张莉莉[1] 侯鹏翔[1] 蒋华 刘畅[1] 成会明[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家联合实验室,沈阳110016 [2]阿尔托大学应用物理系及新材料中心,芬兰赫尔辛基FIN-02150 Espoo

出　　处：《新型炭材料》2011年第1期52-56,共5页New Carbon Materials

基　　金：National Natural Science Foundation of China(50921004,50872137);National Basic Research Program of China(2011CB932601);International Scientific Joint Research Program(2008DFA51400)~~

摘　　要：采用氢电弧法制备了尖锐端头的碳纳米管,获得了具有三种特殊形貌的尖端,即锥形、颈缩形和铅笔状尖端。该特殊形貌的形成可归因于在原料中加入硅粉进而形成的结构缺陷。研究了所得碳纳米管的场发射特性,发现其阈值电场较低,仅为3.75V/mm;场发射电流密度可高达～1.6×105A/cm2;且场发射稳定性好。以上优异的场发射性能归结于该碳纳米管具有良好的结构完整性和独特的尖端结构特征。Carbon nanotubes（CNTs）with sharp tips were synthesized by a hydrogen arc discharge method.Three unusual morphologies,i.e.,a cone-shaped tip,a suddenly-shrinking tip,and a pencil point-like tip were observed.These novel tip structures are considered to be related to the addition of a small amount of silicon powder in the raw material,which may introduce structural defects in the CNTs.The field emission property of the sharp-tip CNTs was investigated,and a low threshold electric field of 3.75 V/m,a high field emission current density of ~1.6×105 A/cm2,and a good emission stability were demonstrated.The superior field emission performance of the CNTs can be attributed to their good crystallinity and unique tip structures.

关 键 词：碳纳米管 尖锐端头 场发射 

分 类 号：TB383.1[一般工业技术—材料科学与工程]