衬底电极对丝网印刷CNT阴极场发射性能的影响

The effect of field emission properties of carbon nanotube cathodes on different substrates

通过丝网印刷技术,将碳纳米管(carbon nanotube,CNT)浆料直接转移到CrCuCr薄膜衬底电极、掺Sn的In2O3(indium tin oxides,ITO)透明导电薄膜衬底电极和Ag浆导电厚膜衬底电极上,高温烧结后得到CNT阴极,并对CNT阴极进行表面形貌和场发射性能的研究。结果表明,不同衬底电极对CNT阴极场发射性能的影响不一样,CrCuCr薄膜衬底电极CNT阴极、ITO透明导电薄膜衬底电极CNT阴极及Ag浆厚膜导电衬底电极CNT阴极场发射的开启电场分别为0.99、2.05和2.46V/μm;当电场为3.0V/μm时,它们的亮度分别为2472、1889、587cd/m2。CrCuCr薄膜衬底电极CNT阴极的场发射性能最优,ITO透明导电薄膜衬底电极CNT阴极次之,Ag浆厚膜导电衬底电极CNT阴极最差,并根据金属-半导体理论模型分析了原因。

The effect of field emission properties of carbon nanotube （CNT） cathodes on CrCuCr thin-film, indium tin oxides （ITO） transparent-film and silver （Ag） paste thick-film were investigated, which prepared by screen-printing, sintered with high temperature. The morphologies of CNT cathodes on different electrode sub- strates were observed by scanning electron mircroscope （SEM）, and the field emission properties were characterized in the same condition of 1.33×10^-5Pa. The results showed that three kinds of CNT cathodes have different field emission properties. The field emission tests indicate that the turn on electric field of the CNT cathode on CrCuCr thin-film is 0.99V/ram, the one on ITO thin-film＇s 2.05V/mm, the one on Ag paste thick-film＇ s 2.46V/mm. When the electric field is 3.0V/μm, the brightness luminosities of CrCuCr-cathode, ITO-cathode and Ag paste-cathode were 2472, 1889, 587cd/m2, respectively. It can be speculated that the field emission property of the CNT cathode on CrCuCr thin-film takes precedence over the others, and the one on Ag paste thick-film is lousiest.