3 years ago

Field Emission Properties of SiO2-wrapped CNT Field Emitter.

Liangxing Hu, Sheel Aditya, Beng Kang Tay, Xin Xia, Yu Dian Lim, Shaomeng Wang, Jianmin Miao, Zishan Ali Syed Mohammed
Carbon Nanotubes (CNTs) exhibit unstable field emission (FE) behaviour with low reliability due to uneven heights of as-grown CNTs. It has been reported that mechanically polished SiO2-wrapped CNT field emitter gives consistent FE performance due to its uniform CNT heights. However, there are still lacked of studies on the comparison between the FE properties of freestanding and SiO2-wrapped CNTs. In this study, we have performed a comparative study on the FE properties of freestanding and SiO2-wrapped CNT field emitters. From the FE measurements, freestanding CNT field emitter requires lower applied voltage of 5.5 V/µm to achieve FE current density of 22 mA/cm2; whereas SiO2-wrapped field emitter requires 8.5 V/µm to achieve the same current density. This can be attributed to the lower CNT tip electric field of CNTs embedded in SiO2, as obtained from the electric field simulation. Nevertheless, SiO2-wrapped CNTs show higher consistency in FE current than freestanding CNTs. Under repeated FE measurement, SiO2-wrapped CNT field emitter achieves consistent FE behaviour from the 1st voltage sweep, whereas freestanding field emitter only achieved consistent FE performance after 3rd voltage sweep. At the same time, SiO2-wrapped CNTs exhibit better emission stability than freestanding CNTs over 4000s continuous emission.

Publisher URL: http://doi.org/10.1088/1361-6528/aa96ed

DOI: 10.1088/1361-6528/aa96ed

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