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首页> 外文期刊>ECS Journal of Solid State Science and Technology >Dual-Functional Magnetic and Field Emission Properties of γ-Fe_2O_3 Coated Carbon Nanotubes Core-Shell Structures
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Dual-Functional Magnetic and Field Emission Properties of γ-Fe_2O_3 Coated Carbon Nanotubes Core-Shell Structures

机译：γ-Fe_2O_3包覆的碳纳米管核-壳结构的双功能磁场和场发射特性

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摘要

A γ-Fe_2O_3 coated carbon nanotube (CNT) core-shell structure with dual magnetic and field emission properties was successfully fabricated by a simple one-step technique. The γ-Fe_2O_3 shell is deposited on vertically aligned multi-walled CNTs by chemical vapor deposition using ferrocene as the precursor at process temperatures of 200, 400 and 600℃. At 400℃, the γ-Fe_2O_3 shell formed a polycrystalline coating of polygonal nanoparticles on the CNTs. Enhanced field emission performance was observed with a threshold field of 4.7 Vμm~(-1) compared to pristine CNTs at 5.6 Vμm~(-1). Magnetic measurements revealed that the γ-Fe_2O_3-CNT composites demonstrated ferrimagnetic behavior with high saturation magnetization of 52.3 emu/g and coercivity of 237 Oe at room temperature.
机译：通过简单的一步法成功地制备了具有双重磁和场发射特性的γ-Fe_2O_3涂层碳纳米管（CNT）核壳结构。以二茂铁为前驱体，在200、400和600℃的工艺温度下，通过化学气相沉积法将γ-Fe_2O_3壳层沉积在垂直排列的多壁CNT上。在400℃时，γ-Fe_2O_3壳在CNTs上形成了多边形纳米颗粒的多晶涂层。与在5.6Vμm〜（-1）的原始CNT相比，在4.7Vμm〜（-1）的阈值场观察到增强的场发射性能。磁性测量表明，γ-Fe_2O_3-CNT复合材料在室温下表现出亚铁磁行为，具有52.3 emu / g的高饱和磁化强度和237 Oe的矫顽力。

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