机构地区: 深圳大学光电子学研究所广东省光电子器件与系统重点实验室
出 处: 《光子学报》 2003年第12期1442-1445,共4页
摘 要: 从Fowler Nordheims理论出发 ,对实验中测得的碳管场发射中ln(I/V2 )~ 1/V并不是严格的线性关系进行了分析 ,认为主要是碳管吸附态 (主要是水蒸气 )的改变引起有效功函数改变 ,同时随着发射电流的增大 ,个别较长碳管表面的突起在残余气体离子轰击下变得平滑甚至缩短 ,热熔化也可能造成碳管缩短 .另一方面 ,随着电场强度的增大 ,较短碳管的场发射对总发射电流的贡献也相对提升 这些因素都会造成场发射中F Based on Fowler-Nordheims theory, the reasons that the F-N curve is not linear, according to experiment, can be explained as follows: the disappearance of adsorbate(mainly H_2O)changes the effect work function of carbon nanotubes.The tube cap is flattened and its length is shortened when it is bombarded by the remained gas particles.The emission contribution of short nanotubes to total currents enhances with the increase of electric field intensity.
领 域: [电子电信]