Synthesis and enhanced field emission of zinc oxide incorporated carbon nanotubes
Synthesis and enhanced field emission of zinc oxide incorporated carbon nanotubes
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DOI：
10.1016/j.diamond.2016.12.007
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发表时间：
2017-01-01
影响因子：
4.1
通讯作者：
Manikandan, E.
中科院分区：
文献类型：
--
作者：
Kennedy, J.;Fang, F.;Manikandan, E.
采用电弧法成功地将氧化锌纳米结构引入到碳纳米管中。对氧化锌复合碳纳米管的形貌研究表明，氧化锌纳米颗粒附着在碳纳米管的表面。X射线衍射、拉曼光谱和阴极发光(CL)光谱证实了氧化锌的存在。拉曼光谱测得碳纳米管和氧化锌碳纳米管的I-D/I-G比值分别为0.44和0.51，表明加入氧化锌后碳纳米管壁的无序度增加。在747 nm处的深红色化学发光峰来源于掺入CNT5的氧化锌的缺陷发射。X射线光电子能谱分析表明，在2862 eV处，SPA杂化的C-O键比CNT_5具有更强的C-O键，表明在ZnO-CNTs中存在更多的C-O键。在电流密度为0.1 mA cm(-2)时，获得了接近1.5Vµm(-1)的低开启场，在电流密度为1 mA cm(-2)时，获得了接近2.9Vµm(-1)的低阈值场，获得了高场增强因子(5741)和稳定的发射电流。简单的合成工艺，再加上良好的发射性能，使其成为低成本、致密的碳纳米管冷阴极材料的候选材料。(C)2016爱思唯尔B.V.保留所有权利。
Zinc oxide (ZnO) nanostructures were successfully incorporated into carbon nanotubes (CNTs) using an arc discharge method. Studies of the morphologies of ZnO incorporated CNTs (ZnO-CNTs) revealed that ZnO nanoparticles were attached on the exterior of CNTs. X-ray diffraction, Raman spectra and cathodoluminescence (CL) spectra revealed the existence of ZnO. The I-D/I-G ratios from Raman spectroscopy for the CNTs and ZnO-CNTs were 0.44 and 0.51, respectively, suggesting an increased degree of disorder of the CNT walls after the incorporation of ZnO. The deep red CL emission peak at 747 nm originated from ZnO defect emission in ZnO incorporated CNT5. X-ray photoelectron spectroscopy results revealed that spa-hybridized C-O bonds at 2862 eV in ZnO-CNTs had higher intensities than CNT5, indicating presence of more C-O bonds in ZnO-CNTs. A low turn-on field of similar to 1.5 V mu m(-1) at a current density of 0.1 mu A cm(-2), low threshold field of similar to 2.9 V mu m(-1) at a current density of 1 mA cm(-2), high field enhancement factor (5741), and stable emission current were obtained from ZnO-CNTs. The simplicity of synthesis, coupled with the promising emission results, make ZnO-CNTs a promising candidate for low-cost, compact CNT cold cathode materials. (C) 2016 Elsevier B.V. All rights reserved.