Study on Direct Growth of Carbon Nanotubes Induced by Electric Field
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摘要: 本文将电场诱导与热化学气相沉积（CVD）直接生长技术相结合，在合金基底上得到了垂直排列的多壁碳纳米管（MWNT）薄膜，MWNT直径约50 nm、长度约2～3 μm。施加电场生长的MWNT的晶体性优于未加电场生长的MWNT，它们的拉曼光谱中D峰与G峰强度比值ID/IG平均值分别为0.76和0.87。垂直排列的MWNT与随机排列的MWNT的开启电场分别为3.0 V/μm和3.8 V/μm；在相同的测试电场下，前者有更高的场发射电流密度，低电流发射稳定性良好，但是MWNT相对密集，电场屏蔽效应较强。采取措施进一步调节MWNT的间距，将有助于提升发射电流密度。Abstract: In this paper,the electric field is applied in the direct Chemical Vapor Deposition(CVD)growth of CNTs to obtain vertically arranged multi-walled carbon nanotube(MWNT)films on alloy substrates.The diameter of the MWNT is about 50 nm and the length is about 2~3 μm.The crystallinities of the MWNTs are better than those grown without electric field,and the average ratios of Raman spectrum D peak to G peak intensities ID/IG are 0.76 and 0.87,respectively.Com-pared with randomly arranged carbon nanotubes,the vertically aligned carbon nanotubes obtained in this work exhibit higher field emission current densities under the same electric field,and the turn-on electric fields are 3.0 V/μm and 3.8 V/μm,respectively.The aligned MWNT emitters presented good emission stability in low emission level,but the dense MWNT distribution result in high electric field shielding effect.Therefore,further attempts to adjust the MWNT spaces will be helpful to increase the emission current density.
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