CAJ | 학술논문

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.该特殊彤貌的彤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.
채용경전호법제비료첨예단두적탄납미관,획득료구유삼충특수형모적첨단,즉추형、경축형화연필상첨단.해특수동모적동성가귀인우재원료중가입규분진이형성적결구결함.연구료소득탄납미관적장발사특성,발현기역치전장교저,부위3.75V/mm;장발사전류밀도가고체～1.6×105A/cm2;차장발사은정성호.이상우이적장발사성능귀결우해탄납미관구유량호적결구완정성화독특적첨단결구특정.
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 properly 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.