Among the three main methods for the s ynthesis of carbon nanotubes(CNTs ),chemical vapor deposition(CVD)has received a great deal of attentio n since CNTs can be synthesized at sig nificantly low temperature.Plasma c...Among the three main methods for the s ynthesis of carbon nanotubes(CNTs ),chemical vapor deposition(CVD)has received a great deal of attentio n since CNTs can be synthesized at sig nificantly low temperature.Plasma chemical vapor deposition me thods can synthesize CNTs at lower te mperature than thermal CVD.But in th e usual catalytic growth of CNTs by CVD,CNTs are often tangled together and have some defects.These will limit t he property research and potential applications.How to synthesize the str aight CNTs at low temperature become s a challenging issue.In this letter,s traight carbon nanotube(CNT)films were achieved by microwave pla sma chemical vapor deposition(MWPCVD)catalyzed by round Fe-Co-Ni alloy particles on Ni substrate at 610℃.It wa s found that,in our experimental condition,the uniform growth rate along the circumference of round alloy particles plays a very important role in the gro wth of straight CNT films.And because the substrate is conducting,the straight CNT films grown at low temperature ma y have the benefit for property research and offer the possibility to use t hem in the future applications.展开更多
使用新型多模MPCVD装置,通过耦合改变微波功率和沉积气压进行大面积金刚石膜均匀沉积研究。结果表明:微波功率一定时,电子密度随气压的上升先上升后下降;电子密度随气压和微波功率耦合上升而上升,其中微波功率起主导作用;当微波功率为5 ...使用新型多模MPCVD装置,通过耦合改变微波功率和沉积气压进行大面积金刚石膜均匀沉积研究。结果表明:微波功率一定时,电子密度随气压的上升先上升后下降;电子密度随气压和微波功率耦合上升而上升,其中微波功率起主导作用;当微波功率为5 k W时,等离子体能量中心随着气压上升先靠近后远离沉积基底;当微波功率为5 k W、气压为15 k Pa时,在直径为75 mm的钼基片上实现了大面积金刚石膜的均匀沉积,中心和边缘区域的拉曼光谱FWHM值为4.69cm-1和4.83 cm-1。展开更多
文摘Among the three main methods for the s ynthesis of carbon nanotubes(CNTs ),chemical vapor deposition(CVD)has received a great deal of attentio n since CNTs can be synthesized at sig nificantly low temperature.Plasma chemical vapor deposition me thods can synthesize CNTs at lower te mperature than thermal CVD.But in th e usual catalytic growth of CNTs by CVD,CNTs are often tangled together and have some defects.These will limit t he property research and potential applications.How to synthesize the str aight CNTs at low temperature become s a challenging issue.In this letter,s traight carbon nanotube(CNT)films were achieved by microwave pla sma chemical vapor deposition(MWPCVD)catalyzed by round Fe-Co-Ni alloy particles on Ni substrate at 610℃.It wa s found that,in our experimental condition,the uniform growth rate along the circumference of round alloy particles plays a very important role in the gro wth of straight CNT films.And because the substrate is conducting,the straight CNT films grown at low temperature ma y have the benefit for property research and offer the possibility to use t hem in the future applications.
文摘使用新型多模MPCVD装置,通过耦合改变微波功率和沉积气压进行大面积金刚石膜均匀沉积研究。结果表明:微波功率一定时,电子密度随气压的上升先上升后下降;电子密度随气压和微波功率耦合上升而上升,其中微波功率起主导作用;当微波功率为5 k W时,等离子体能量中心随着气压上升先靠近后远离沉积基底;当微波功率为5 k W、气压为15 k Pa时,在直径为75 mm的钼基片上实现了大面积金刚石膜的均匀沉积,中心和边缘区域的拉曼光谱FWHM值为4.69cm-1和4.83 cm-1。
