Study of field emission of multiwalled C nanotubes synthesized by arc discharge
Study of field emission of multiwalled C nanotubes synthesized by arc discharge
复制标题
DOI：
10.1088/0953-8984/19/39/395014
复制
发表时间：
2007-08
期刊：
影响因子：
--
通讯作者：
S. Bellucci;C. Balasubramanian;F. Micciulla;A. Tiberia
中科院分区：
文献类型：
--
作者：
S. Bellucci;C. Balasubramanian;F. Micciulla;A. Tiberia
采用直流热等离子体法合成了碳纳米管。通过优化合成工艺参数，如压力、电流等，对合成产物，特别是阳极存款进行了扫描电镜和透射电镜表征。产物的形貌被确定为多壁碳纳米管在大比例。这些纳米管的直径约为30-50 nm，长度可达1微米，有时甚至为2或3 µm。然后研究了这些纳米管的场发射性能。碳纳米管沉积在作为阴极的金属短柱上。注意确保短柱的完全覆盖，以消除金属短柱本身发射的任何可能性。发射研究是在10 - 8 Torr范围内的动态真空下在不锈钢室中进行的。使用磷涂覆的氧化铟锡（ITO）玻璃检测场发射电流。磷涂层也有助于纳米管尖端的成像。这对准确估计发射面积和场增强因子至关重要。记录了不同电极间距下的场发射I-V曲线。结果如下所示。
Carbon nanotubes (CNTs) were synthesized by a DC thermal plasma method. After optimizing the synthesis parameters such as the pressure, current etc, the synthesized products, and the anodic deposit in particular, were characterized by scanning electron and transmission electron microscopy. The morphology of the product was ascertained to be multiwalled carbon nanotubes in a large ratio. The diameters of these nanotubes were of the order of 30–50 nm with lengths extending up to a micron and sometimes even 2 or 3 µm. The field emission properties of these nanotubes were then studied. The CNTs were deposited on a metal stub which acted as the cathode. Care was taken to ensure complete coverage of the stub to remove any possibility of emission from the metallic stub itself. The emission studies were performed in a stainless steel chamber under a dynamic vacuum in the range of 10−8 Torr. The field emitted current was detected using a phosphorus coated indium tin oxide (ITO) glass. The phosphorus coating also helped in imaging the tips of the nanotubes. This was crucial in estimating accurately the emitting area and thus the field enhancement factor. The I–V curves for the field emission were recorded for various distances between the electrodes. The results are shown here.