Large-scale synthesis and field emission properties of vertically oriented CuO nanowire films
Large-scale synthesis and field emission properties of vertically oriented CuO nanowire films
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DOI：
10.1088/0957-4484/16/1/018
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发表时间：
2005-01-01
期刊：
影响因子：
3.5
通讯作者：
Sow, CH
中科院分区：
文献类型：
--
作者：
Zhu, YW;Yu, T;Sow, CH
采用一种简单的方法，在空气中直接加热大块铜板，定向CuO纳米线薄膜的大规模合成。纳米线的长度和密度可以通过生长温度和生长时间来控制。CuO纳米线薄膜的场发射（FE）测量表明，它们具有3.5-4.5 V μ m（-1）的低开启场和在约7 V μ m（-1）的外加场下0.45 mA cm（-2）的大电流密度。通过比较两种不同平均长度和密度的样品（分别为30 μ m，10（8）cm（-2）和4 μ m，4 × 10（7）cm（-2））的场发射性能，我们发现大的长径比的CuO纳米线有效地改善了局域场，这有利于场发射。通过有限元计算验证了取向CuO纳米线薄膜的功函数为2.5-2.8 eV。
Using a simple method of direct heating of bulk copper plates in air, oriented CuO nanowire films were synthesized on a large scale. The length and density of nanowires could be controlled by growth temperature and growth time. Field emission (FE) measurements of CuO nanowire films show that they have a low turn-on field of 3.5-4.5 V mum(-1) and a large current density of 0.45 mA cm(-2) under an applied field of about 7 V mum(-1). By comparing the FE properties of two types of samples with different average lengths and densities (30 mum, 10(8) cm(-2) and 4 mum, 4 x 10(7) cm(-2), respectively), we found that the large length-radius ratio of CuO nanowires effectively improved the local field, which was beneficial to field emission. Verified with finite element calculation, the work function of oriented CuO nanowire films was estimated to be 2.5-2.8 eV.