新型炭材料
新型炭材料
신형탄재료
NEW CARBON MATERIALS
2011年
6期
401-407
,共7页
热化学气相沉积%硅纳米丝%碳纳米管%场发射
熱化學氣相沉積%硅納米絲%碳納米管%場髮射
열화학기상침적%규납미사%탄납미관%장발사
Thermal chemical vapor deposition%Silicon nanowires%Carbon nanotubes%Field emission
利用热化学气相沉积法在负载不同厚度催化剂的硅纳米丝(SiNW)表面生长碳纳米管(CNTs),探讨了生长条件对所合成SiNW-CNT的结构和场发射特性的影响.这种类似树状的三维结构具有较高碳纳米管表面密度及降低的电场筛除效应等潜在优势.使用拉曼光谱( Raman)、电子显微镜(SEM)、透射电子显微镜(TEM)、能量扩散分光仪(EDS)分析了碳纳米管的结构性质,并在高真空下施加电场测得碳纳米管的场发射特性.结果表明:随硅纳米丝上负载催化剂镍膜厚度的变化,所合成碳纳米管的表面特性、结晶结构及功函数改变,导致电子发射难易程度的改变,进一步影响碳纳米管的场发射特性.
利用熱化學氣相沉積法在負載不同厚度催化劑的硅納米絲(SiNW)錶麵生長碳納米管(CNTs),探討瞭生長條件對所閤成SiNW-CNT的結構和場髮射特性的影響.這種類似樹狀的三維結構具有較高碳納米管錶麵密度及降低的電場篩除效應等潛在優勢.使用拉曼光譜( Raman)、電子顯微鏡(SEM)、透射電子顯微鏡(TEM)、能量擴散分光儀(EDS)分析瞭碳納米管的結構性質,併在高真空下施加電場測得碳納米管的場髮射特性.結果錶明:隨硅納米絲上負載催化劑鎳膜厚度的變化,所閤成碳納米管的錶麵特性、結晶結構及功函數改變,導緻電子髮射難易程度的改變,進一步影響碳納米管的場髮射特性.
이용열화학기상침적법재부재불동후도최화제적규납미사(SiNW)표면생장탄납미관(CNTs),탐토료생장조건대소합성SiNW-CNT적결구화장발사특성적영향.저충유사수상적삼유결구구유교고탄납미관표면밀도급강저적전장사제효응등잠재우세.사용랍만광보( Raman)、전자현미경(SEM)、투사전자현미경(TEM)、능량확산분광의(EDS)분석료탄납미관적결구성질,병재고진공하시가전장측득탄납미관적장발사특성.결과표명:수규납미사상부재최화제얼막후도적변화,소합성탄납미관적표면특성、결정결구급공함수개변,도치전자발사난역정도적개변,진일보영향탄납미관적장발사특성.
Carbon nanotubes (CNTs) were grown on a silicon nanowire substrate with Ni-catalyst layers of different thicknesses using thermal chemical vapor deposition.Scanning electron microscopy was used to observe the surface morphology,and Raman spectroscopy was used to investigate the structural changes in relation to the thicknesses of the catalyst deposited on the substrate.Field-emission characteristics of CNTs were also correlated with the catalyst thicknesses.The catalyst thickness was found to effectively change the field-emission characteristics of the CNTs.Obvious changes in the diameters,population density,and morphology of CNTs were found with differences in catalyst thickness.The fieldemission characteristics of CNTs were dependent on their diameter.
