Synthesis and enhanced field emission of zinc oxide incorporated carbon nanotubes

Kennedy, J.; Fang, F.; Futter, J.; Leveneur, Jérôme; Murmu, Peter P.; Panin, G. N.; Kang, Tae‐Won; Manikandan, E.

doi:10.1016/j.diamond.2016.12.007

Cited by 115 publications

(23 citation statements)

References 45 publications

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“…modified a glassy carbon electrode with CNTs/ZnO composites to act as a gas sensor. More recently, ZnO nanoparticles were supported on the surface of CNTs to improve the field emission characteristics of the CNTs . CNTs and zinc oxide nanocomposites were synthesized by using a plasma‐enhanced chemical vapor deposition method .…”

Section: Introductionmentioning

confidence: 99%

“…CNTs/ZnO composites to act as ag as sensor.M ore recently, ZnO nanoparticles were supported on the surface of CNTst o improvet he field emission characteristics of the CNTs. [18,19] CNTsa nd zinc oxide nanocomposites were synthesized by using ap lasma-enhanced chemical vapor deposition method. [20] Freire et al [21] reported that the electrocatalytic oxidation of phenolic compounds increased after the morphology of ZnO nanoparticles was changed by bonding withC NTs.…”

Section: Introductionmentioning

confidence: 99%

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Accelerating the Photocatalytic Degradation of Green Dye Pollutants by Using a New Coating Technique for Carbon Nanotubes with Nanolayered Structures and Nanocomposites

et al. 2018

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The present study has two aims, first to accelerate the degradation of pollutants by coating carbon nanotubes (CNTs) with nanoplatelets or nanocomposites of aluminum zinc oxides and second to fabricate an advanced photocatalyst. Accordingly, Zn‐Al layered double hydroxides (LDHs) were grown in the presence of functionalized CNTs during urea hydrolysis. The presence of CNTs led to the formation of LDH nanoplatelets, and TEM images showed that the CNTs were coated with nanoplatelets. The nanoplatelets were thermally treated to form nanocomposite‐coated CNTs. Raman spectra demonstrated the successful coating of CNTs with LDHs and nanocomposite. The coated CNTs were very effective in the photocatalytic degradation of industrial pollutants. A kinetics study demonstrated that the rate of photocatalytic degradation of green dye in the presence of CNTs coated with aluminum zinc oxide nanocomposite was five times faster than with the aluminum zinc oxide nanocomposite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accelerating the Photocatalytic Degradation of Green Dye Pollutants by Using a New Coating Technique for Carbon Nanotubes with Nanolayered Structures and Nanocomposites

et al. 2018

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“…The Raman spectrum of synthesized CNT is shown in Figure 3 F. Typically, the first order G band (corresponding to the degree of nanotubes graphitization) and D band (corresponding to the degree of nanotubes structure disorder) for MWCNT are respectively ~1580 and ~1350 cm −1 [ 10 , 28 ]. In this Raman spectrum, obtained G and D bands are respectively 1582.8 and 1357.6 cm −1 , confirming the presence of MWCNTs possessing the intensity ratio ID/IG of 0.81.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

et al. 2018

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In this study, a simple, efficient, and economical process is reported for the direct synthesis of carbon nanotube (CNT) field emitters on metal alloy. Given that CNT field emitters can be customized with ease for compact and cold field emission devices, they are promising replacements for thermionic emitters in widely accessible X-ray source electron guns. High performance CNT emitter samples were prepared in optimized plasma conditions through the plasma-enhanced chemical vapor deposition (PECVD) process and subsequently characterized by using a scanning electron microscope, tunneling electron microscope, and Raman spectroscopy. For the cathode current, field emission (FE) characteristics with respective turn on (1 μA/cm2) and threshold (1 mA/cm2) field of 2.84 and 4.05 V/μm were obtained. For a field of 5.24 V/μm, maximum current density of 7 mA/cm2 was achieved and a field enhancement factor β of 2838 was calculated. In addition, the CNT emitters sustained a current density of 6.7 mA/cm2 for 420 min under a field of 5.2 V/μm, confirming good operational stability. Finally, an X-ray generated image of an integrated circuit was taken using the compact field emission device developed herein.

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“…The unique coiled structure is attracting much interest and various techniques have been adopted to synthesize c-CNTs include flame combustion, laser evaporation, arc discharge and chemical vapor deposition (CVD) (Kennedy et al 2017;Mohana Krishna and Somanathan 2016;Motaung et al 2010;Raghubanshi et al 2016). CVD system is the most considered method amongst due to its simplicity of growth, straightforward, cost effectiveness, the applicability of a wide range of substrates, massive scalability and also comparatively low growth temperature permits carbon particle to travel gradually and form non-hexagonal carbon rings especially in c-CNTs.…”

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of coiled-like shaped carbon nanotubes using bi-metal catalyst

et al. 2018

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Carbon nanomaterials (CNMs), especially carbon nanotubes (CNTs) with coiled structure exhibit scientifically fascinating. They may be projected as an innovative preference to future technological materials. Coiled carbon nanotubes (c-CNTs) on a large-scale were successfully synthesized with the help of bi-metal substituted α-alumina nanoparticles catalyst via chemical vapor deposition (CVD) technique. Highly spring-like carbon nanostructures were observed by field emission scanning electron microscope (FESEM) examination. Furthermore, the obtained material has high purity, which correlates the X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX) analysis. Raman spectroscopy reveals that the carbon multi layers are well graphitized and crystalline, even if they have defects in its structure due to coiled morphology. High-resolution transmission electron microscope (HRTEM) describes internal structure and dia of the product. Ultimately, results support the activity of bi-metal impregnated α-alumina nanoparticles catalyst to determine the high yield, graphitization and internal structure of the material. We have also studied the purified c-CNTs magnetic properties at room temperature and will be an added advantage in several applications.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Synthesis and enhanced field emission of zinc oxide incorporated carbon nanotubes

Cited by 115 publications

References 45 publications

Accelerating the Photocatalytic Degradation of Green Dye Pollutants by Using a New Coating Technique for Carbon Nanotubes with Nanolayered Structures and Nanocomposites

Accelerating the Photocatalytic Degradation of Green Dye Pollutants by Using a New Coating Technique for Carbon Nanotubes with Nanolayered Structures and Nanocomposites

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

Large-scale synthesis of coiled-like shaped carbon nanotubes using bi-metal catalyst

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