Growth of carbon nanofibers on aligned zinc oxide nanorods and their field emission properties
Growth of carbon nanofibers on aligned zinc oxide nanorods and their field emission properties
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DOI：
10.1016/j.apsusc.2010.03.136
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发表时间：
2010-08
影响因子：
6.7
通讯作者：
R. Gayen;A. Pal
中科院分区：
文献类型：
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作者：
R. Gayen;A. Pal
采用混合湿化学法在玻璃衬底上制备了氧化锌纳米棒，并通过电沉积技术在氧化锌纳米棒上生长了碳纳米纤维。X-射线衍射曲线表明ZnO的（002）面有很强的反射峰。拉曼光谱主要由在约1597 cm-1处的G带和在约1350 cm-1处的D带所支配，G带对应于具有sp2杂化的有序石墨结构的E2 g切向伸缩模式，D带源自无序碳。傅里叶变换红外光谱研究表明，在Zn-O伸缩模的λ 511 cm-1处存在明显的特征吸收峰。光致发光谱表明ZnO的带边发光在3.146eV处，沿着有一个低强度的峰在0.877eV处，由碳纳米纤维产生。这些薄膜的场发射性能和它们对ZnO纳米棒上的CNF覆盖的依赖性在这里报道。从FN曲线的斜率确定的平均场增强因子在1× 103和3×103之间变化。CNF/ZnO纳米棒的开启电场和阈值电场均低于纯ZnO纳米棒。
Carbon nanofibers were grown by electrodeposition technique onto aligned zinc oxide (ZnO) nanorods deposited by hybrid wet chemical route on glass substrates. X-ray diffraction traces indicated very strong peak for reflections from (002) planes of ZnO. The Raman spectra were dominated by the presence of G band at about 1597cm−1corresponding to the E2gtangential stretching mode of an ordered graphitic structure with sp2hybridization and a D band at about 1350cm−1originating from disordered carbon. Fourier transformed infrared studies indicated the presence of a distinct characteristic absorption peak at ∼511cm−1for Zn–O stretching mode. Photoluminescence spectra indicated band edge luminescence of ZnO at ∼3.146eV along with a low intensity peak at ∼0.877eV arising out of carbon nanofibers. Field emission properties of these films and their dependence on the CNF coverage on ZnO nanorods are reported here. The average field enhancement factor as determined from the slope of the FN plot was found to vary between 1×103and 3×103. Both the values of turn-on field and threshold field for CNF/ZnO were lower than pure ZnO nanorods.