Vertically aligned single-crystalline ultra-thin CuO nanosheets: Low-temperature fabrication, growth mechanism, and excellent field emission

Vertically aligned single-crystalline ultra-thin CuO nanosheets: Low-temperature fabrication, growth mechanism, and excellent field emission
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垂直排列单晶超薄氧化铜纳米片:低温制造、生长机制和优异的场发射

DOI:
10.1016/j.jallcom.2014.04.159
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发表时间:
2014-10
影响因子:
6.2
通讯作者:
Cheng-Wei Wang
Cheng-Wei Wang
中科院分区:
材料科学2区
文献类型:
--
作者:
Wei-Dong Zhu;Jian-Biao Chen;Xu-Qiang Zhang;Cheng-Wei Wang

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采用溶剂热法在90 °C低温下在Cu衬底上制备了具有高质量单晶结构的垂直取向超薄CuO纳米片。所制备的纳米片的厚度和尺寸可以通过改变反应时间和温度来定制。在实验结果的基础上,一个可能的机制,垂直排列的超薄CuO纳米片的形成进行了推测。此外,所制备的超薄CuO纳米片具有良好的场发射性能,在8.23 V/μm时,最佳样品的开启电场为2.19 V/μm,电流密度为4.5 mA/cm 2。更重要的是,优化后的样本还表现出出色的FE稳定性,波动范围在2%以内。基于随温度变化的FE测量,稳定的FE性能可以归因于片状CuO发射体的低局部加热效应,源自其上级散热能力和低焦耳加热。
An effective and one-step solvothermal process is developed to fabricate vertically aligned ultra-thin CuO nanosheets with high-quality single crystalline structure on Cu substrate at low temperature of 90 °C. The thickness and size of the prepared nanosheets can be tailored by changing reaction duration and temperature. On the basis of experimental results, a possible mechanism for the formation of the vertically aligned ultra-thin CuO nanosheets is speculated. Moreover, the prepared ultra-thin CuO nanosheets exhibit excellent field emission (FE) properties, a low turn-on electric field of 2.19 V/μm and a high current density of 4.5 mA/cm2at 8.23 V/μm can be realized from the optimized sample. More importantly, the optimized sample also shows excellent FE stability with fluctuations within 2%. Based on temperature-dependent FE measurement, the stable FE property can be attributed to the low local heating effects of sheet-like CuO emitters, originating from their superior heat dissipation ability and low Joule heating.
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