Electron field emission from the carbon-doped TiO2 nanotube arrays
Electron field emission from the carbon-doped TiO2 nanotube arrays
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DOI：
10.1016/j.tsf.2011.05.073
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发表时间：
2011-09
期刊：
影响因子：
2.1
通讯作者：
Lin-Qing Wang;Chengwei Wang;Jianbiao Chen;Ruisheng Guo;F. Zhou;Wei-min Liu
中科院分区：
文献类型：
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作者：
Lin-Qing Wang;Chengwei Wang;Jianbiao Chen;Ruisheng Guo;F. Zhou;Wei-min Liu
研究了碳掺杂二氧化钛纳米管阵列(TNAS)的场发射特性，该纳米管阵列是通过在连续的Ar和乙炔流量下进行热处理而得到的。用场发射扫描电子显微镜(FE-SEM)、X射线衍射仪(X射线衍射仪)和X射线光电子能谱(XPS)对样品的形貌、晶体结构和成分进行了表征。结果表明，碳掺杂后，样品的开启电场从21.9V/μm降至5.0V/μm，场发射电流密度在11.8V/cm2时迅速达到9.0 mA/cm~2。场发射特性的显著改善主要归因于TnAs中的碳掺杂降低了功函数和提高了电导率。
The field-emission characteristics of the carbon-doped TiO2 nanotube arrays (TNAs), which can be obtained by a heat treatment of the as-fabricated TNAs under a continuous argon and acetylene flux, were investigated. The morphology, crystalline structure, and composition of the as-grown specimens were characterized by the use of field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. It was found that the samples' turn-on electric field is reduced from 21.9 to 5.0 V/μm and the field-emission current density rapidly reaches about 9.0 mA/cm2 at 11.8 V/μm after carbon doping. The dramatically improved field-emission characteristics would be mainly attributed to the reduced work function and the enhanced conductivity due to the carbon doping into TNAs.