Field emission properties from multi-walled carbon nanotubes grown on silicon nanoporous pillar array
Multi-walled carbon nanotubes (CNTs) were grown on a silicon nanoporous pillar array (Si-NPA) by thermal chemical vapor deposition (CVD). Surface morphologies and microstructure of the resultant have been studied by a field emission scanning electron microscope (FE-SEM), Raman spectrum, transmission electron microscope (TEM) and high-resolution transmission electron microscopy (HRTEM). The composition of samples was determined by energy dispersive X-ray spectroscopy (EDS). The results showed that a great deal of CNTs, with diameter in the range of 20-70 nm, incorporated with Si-NPA and a large scale nest array of CNTs/Si-NPA (NACNT/Si-NPA) is formed. EDS analyse showed that the composition of carbon nanotubes was carbon. Field emission measurements showed that a current density of 5 mA/cm2 was obtained at an electric field of 4.26 V/μm, with a turn-on field of 1.3 V/μm. The enhancement factor calculated according to the Fowler-Nordheim theory was ～11000. This excellent field emission performance is attributed to the unique structure and morphology of NACNT/Si-NPA, especially the formation of a nest-shaped carbon nanotube array. A schematic drawing that illustrate the experimental configuration is given. These results indicate that NACNT/Si-NPA might be an ideal candidate cathode for potential applications in flat panel displays.
Electron field emission Carbon nanotube Silicon nanoporous pillar array Chemical vapor deposition
姜卫粉 李隆玉 肖顺华 杨晓辉 贾敏 李新建
北水利水电学院数学与信息科学学院 郑州大学物理工程学院材料物理实验室
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）