Field emission from gallium-doped zinc oxide nanofiber array
Field emission from gallium-doped zinc oxide nanofiber array
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DOI：
10.1063/1.1651328
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发表时间：
2004-03-01
影响因子：
4
通讯作者：
Chen, BJ
中科院分区：
文献类型：
--
作者：
Xu, CX;Sun, XW;Chen, BJ
采用气相传输法将氧化锌、氧化镓和石墨粉末混合在空气中加热，制备了掺镓氧化锌纳米纤维。氧化锌纤维沿着[002]方向生长，形成主要垂直于基底表面的垂直排列阵列。其中镓掺杂浓度为0.73at. %，相应的载流子浓度和电阻率分别为3.77 × 10（20）cm（-3）和8.9 × 10（-4）Ω cm。这些垂直排列的ZnO纤维阵列的场发射显示出低的场发射阈值（在0.1 μ A/cm（2）的电流密度下为2.4V/μ m）、高的电流密度和高的场增强因子（2317）。发射电流密度随电场的变化符合Fowler-Nordheim关系。增强的场发射归因于镓掺杂导致的纳米纤维的对准结构、良好的晶体质量，特别是改进的电性能（增加的导电性和降低的功函数）。(C)2004年，美国物理学会。
Gallium-doped nanostructural zinc oxide fibers have been fabricated by vapor-phase transport method of heating the mixture of zinc oxide, gallium oxide, and graphite powders in air. The zinc oxide fibers grew along [002] direction, forming a vertically aligned array that is predominantly perpendicular to the substrate surface. With a gallium doping concentration of 0.73 at. %, the corresponding carrier concentration and resistivity were 3.77x10(20) cm(-3) and 8.9x10(-4) Omega cm, respectively. The field emission of these vertically aligned ZnO fiber arrays showed a low field emission threshold (2.4 V/mum at a current density of 0.1 muA/cm(2)), high current density, and high field enhancement factor (2317). The dependence of emission current density on the electric field followed Fowler-Nordheim relationship. The enhanced field emission is attributed to the aligned structure, good crystal quality, and especially, the improved electrical properties (increased conductivity and reduced work function) of the nanofibers due to gallium doping. (C) 2004 American Institute of Physics.