纳米金刚石的变温场发射

Temperature dependence of field emission of nano-diamond

研究了温度变化对沉积在钛基底上的纳米金刚石的场发射特性的影响,发现纳米金刚石场发射电流随温度和电场的升高而增大,场发射特性偏离了传统的Fowler-Nordheim理论,场发射电流的稳定性基本没有变化.分析了场发射电流增大的机理,表明是由于纳米金刚石的尺度效应以及外电场下金刚石产生了大量的热载流子共同作用的结果.研究还表明基底钛在温度升高到一定程度后,在外加电场下会有较大的电流产生,对场发射造成较大的影响,表明基底钛具有一定的温度敏感性和电压敏感性.

The field emission characteristics of nano-diamond deposited on titanium substrate at various temperatures are studied.It was found that the emission current increases with increase of temperature and electric field,while the stability of the emission current basically does not change.The field emission characteristic deviates from classic Fowler-Nordheim theory.The mechanism of the emission current at different temperatures is analyzed.It may be due to the combined action of scale effect of the nano-diamond and masses of hot carrier produced by nano-diamonds in external electric field.In addition,the research indicates that larger current can be generated after titanium substrates being heated up to a certain degree in external electric field,which can have large effect on field emission,showing that the titanium substrate has a certain degree of temperature sensitivity and voltage sensitivity.