有机材料NPB纳米点阵列的制备及其场发射性能  

Field emission properties of NPB nanodot arrays

作　　者：徐春龙[1] 王真[1] 左亚路[2] 席力[2] 石国杰 

机构地区：[1]长安大学理学院,陕西西安710064 [2]兰州大学磁学与磁性材料教育部重点实验室,甘肃兰州730000

出　　处：《陕西师范大学学报（自然科学版）》2016年第4期56-59,共4页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(51171076;51101079);中央高校基本科研业务费专项资金(310812151002)

摘　　要：通过真空热蒸发法制备了N,N′-二苯基-N,N′-(1-萘基)-1,1′-联苯-4,4′-二胺(N,N′-Di-[(1-naphthalenyl)-N,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine;NPB)纳米点阵列。通过AFM和SEM对其形貌进行了表征。在高真空下,利用循环测试法测量了样品的场发射性能,其开启电场和阈值电场值分别为4.5和15V/μm,最大电流密度可达1.68mA/cm2。同时,随着测试电场循环升高降低,相应的电流密度曲线出现了明显的滞后,这主要是由于在高真空下样品表面小分子气体的吸附/去吸附效应导致样品的功函数发生变化。长时间测试结果表明,NPB纳米点阵列的场发射性能表现出了良好的稳定性。A thermal evaporation method in high vacuum has been developed to synthesize N,N′-Di-[（1-naphthalenyl）-N,N′-diphenyl]-1,1′-biphenyl）-4,4′-diamine（NPB）nanodot arrays.The morphology of the sample was investigated with SEM and AFM.A cycle-testing of field emission behavior was carried out for NPB nanoarrays.The field-emission characteristics of the nanodot arrays exhibit that turn-on field is 4.5 V/μm,the threshold field is 15 V/μm and a maximum current density is 1.68mA/cm2.A obvious hysteresis in the cycle testing with continuous rising and falling current density was observed in the case of the considered samples,which can be attributed to microstructure and adsorption/desorption effect.It is shown that the NPB nanodot arrays showed good current stability in a long time test.

关 键 词：NPB 热蒸发法 纳米点阵列 场发射 

分 类 号：N27[自然科学总论] O462.4[理学—电子物理学]