Enhanced field emission characteristics of zinc oxide mixed carbon nano-tubes films

Pan, Jinyan; Chen, Zhu; Gao, Yu

doi:10.1016/j.apsusc.2007.12.002

Cited by 28 publications

(18 citation statements)

References 23 publications

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“…Many researches have performed field emissions using CNTs [2,3] because of their special properties such as high aspect ratio, low work function, good electrical conductivity and stable thermal properties [4]. To improve the CNT field emission property some metal-oxides, such as ZnO [5,6], MgO [7,8], and iron oxide [9], have been attached or doped into CNTs to enhance the emission sites and/or change the work function. The synthesized metal-oxide/CNTs have lower turn-on voltages compared with the original CNTs.…”

Section: Introductionmentioning

confidence: 99%

Growth of needle-like RuO2 nanocrystals on carbon nanotubes and their field emission characteristics

Lian¹,

Lee²,

Chen³

et al. 2009

Diamond and Related Materials

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Section: Introductionmentioning

confidence: 99%

Growth of needle-like RuO2 nanocrystals on carbon nanotubes and their field emission characteristics

Lian¹,

Lee²,

Chen³

et al. 2009

Diamond and Related Materials

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“…In our previous work, ZnO nanoparticles have been successfully synthesized using plants [12,13]. Recently, ZnO nanocomposites grown onto MWNTs could reduce the threshold electric field because ZnO has smaller electron affinity than the MWNTs, and the MWNTs/ZnO nanocomposites junction is similar to a ZnO/metal junction allowing electrons to be easily emitted into a vacuum [14,15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Multi-walled Carbon Nanotubes/ZnO Nanocomposites using Absorbent Cotton

Luo

Qin

2011

Nano-Micro Lett.

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This letter focuses on the synthesis of multi-walled carbon nanotubes (MWNTs) and MWNTs/ZnO nanocomposites using absorbent cotton. The MWNTs have been synthesized by a rapid heating of absorbent cotton at different temperature (400℃, 550℃, 600℃). The MWNTs/ZnO nanocomposites have been synthesized by heating mixtures of Zn(OH)2/H2O/absorbent cotton at different temperature (at about 550℃ and 600℃). The X-ray diffraction (XRD) pattern and energy dispersive spectrum (EDS) clearly show that the pure MWNTs and ZnO nanocomposites (with a mean size of 35.9 nm) were synthesized. The scanning electron microscopy (SEM) images demonstrate that the structure of synthesized MWNTs was middle-hollow, with inner and outer diameter of around 10 and 80 nm. The ZnO nanocomposites that had grown on the walls of MWNTs were nonuniform and agglomerated, with an outer diameter of around 110 nm. The selected area diffraction (SAD) patterns and Raman spectrum indicate that the MWNTs were well-crystallised, and there are a few defects in the walls. Infrared absorption spectroscopy (IR) spectra suggest that the surface of MWNTs has been covered by ZnO.

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“…As a result, many pre-and post-treatment methods are developed to improve the emission characteristics of CNT films. For example, to improve emission uniformity of cathode film, mechanical rubbing and adhesive tapping have been applied to increase effective CNT emitters [8]. However, even under the best control using current technology, the dispersion of emitter electrodes and the surface morphology inherited from the screen printing process show some variations from pixel to pixel.…”

Section: Cnt-blu Luminance Uniformitymentioning

confidence: 99%

The development of luminance uniformity measurement for CNT-BLU based on human visual perception

Tang

Lee

2011

Journal of the Chinese Institute of Industrial Engineers

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Carbon nanotube backlight units (CNT-BLUs) offer advantages (including light weight and superior color performance) that cold cathode fluorescent lamp backlight units (CCFL-BLUs) cannot deliver. If these advantages find favor with liquid crystal display manufacturers, CNT-BLUs could possibly replace CCFL-BLUs. CNT-BLU light-emitting arrays are made by a thick-film screen printing process, which can leave dark obstructions within and between pixel areas. Thus, when the pixels light up, CNT-BLU arrays can display dark blotches within one or more pixels. Existing luminance uniformity measurements, such as Video Electronics Standards Association (VESA) or International Organization for Standardization (ISO) standards, are not designed to deal with this problem. These standards are based on the luminance of multiple non-adjacent points on a display; they cannot reflect the luminance change of adjacent pixels, which is important for measuring the uniformity of CNT-BLU. This situation is aggravated since CNT-BLU is still under development and the current luminance uniformity of CNT-BLU still cannot compete with that of CCFL. This study presents a new luminance uniformity measurement, line non-uniformity, for CNT-BLU. This method was compared with VESA and U Formula with respect to human perception. A set of CNT-BLU images with different levels of mottling was presented to 18 participants. The subjective acceptance thresholds for these images were then calculated. The uniformities using VESA, U Formula, and line non-uniformity approaches for these images were also calculated and fitted to the subjective acceptance threshold. The results showed that line non-uniformity was the best to fit the acceptance threshold; its R 2 ranged from 0.80 to 0.92 whereas the R 2 values of VESA and U Formula ranged from 0.00 to 0.49.

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Enhanced field emission characteristics of zinc oxide mixed carbon nano-tubes films

Cited by 28 publications

References 23 publications

Growth of needle-like RuO2 nanocrystals on carbon nanotubes and their field emission characteristics

Growth of needle-like RuO2 nanocrystals on carbon nanotubes and their field emission characteristics

Synthesis of Multi-walled Carbon Nanotubes/ZnO Nanocomposites using Absorbent Cotton

The development of luminance uniformity measurement for CNT-BLU based on human visual perception

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