Growth of Aligned Carbon Nanotubes and Their Applications

Kang, Lixing; Li, D.; Yong, Zhang; Zhang, X.H.; Li, Q.

doi:10.1016/b978-0-323-41481-4.00013-7

Cited by 7 publications

(4 citation statements)

References 93 publications

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“…Additionally, the lack of homogeneous coating could be explained by excessively entangled CNTs, as opposed to Stano et al who used chloride-mediated VACNT growth, which generates thicker, less entangled CNTs, compared to wafer-grown . Our choice of the growth method is justified by higher process robustness, as many operator-related issues are eliminated, such as adequately spreading precursor power . Second, wafer-grown VACNTs tend to exhibit greater aromaticity compared to chloride-mediated VACNTs …”

Section: Resultsmentioning

confidence: 99%

“…69 Our choice of the growth method is justified by higher process robustness, as many operator-related issues are eliminated, such as adequately spreading precursor power. 70 Second, wafer-grown VACNTs tend to exhibit greater aromaticity compared to chloride-mediated VACNTs. 48 This desire to preserve the initial properties of the VACNTs also recommends against using methods such as pyrolytic carbonization, graphitization, and O 2 /CF 4 plasma, 48 which increases hydrophilicity significantly, but at the cost of severely defecting the CNTs themselves.…”

Section: Process Parametermentioning

confidence: 99%

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Alumina Thin-Film Deposition on Rough Topographies Comprising Vertically Aligned Carbon Nanotubes: Implications for Membranes, Sensors, and Electrodes

Rovinsky

Barick

Lieberman

et al. 2020

ACS Appl. Nano Mater.

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In this article, the limits of thin-film deposition on very rough topographies are demonstrated by depositing alumina on vertically aligned carbon nanotubes (VACNTs). Vapor deposition techniques are the enabling platforms of the thin-film industry, offering high material versatility and good coverage ability on relatively flat surfaces, leading to frequent use in a large array of applications, especially nanoscale electronic devices such as sensors and electrodes. However, when surface topography exhibits high roughness, even depositions that are not limited to line-of-sight show only partial coverage, significantly hindering performances. Our manufacturing process of VACNT/Al2O3 nanocomposites has three vaporous steps: CNT growth by chemical vapor deposition (CVD), functionalization via controlled thermal oxidation, and atomic layer deposition (ALD) of alumina. The same limited accessibility hinders each of these three steps. Morphological analyses show different CNT heights throughout the sample, with shorter CNTs in the middle, having less access to gases. As height differences between the center and peripheries escalate, sample centers may collapse under the tension. The limited accessibility of the center is manifested also in inhomogeneous oxygen contents, between sample centers and peripheries. Finally, a sharp transition in deposition quality occurs during the deposition process of Al2O3, from homogeneous to inconsistent, which is also linked to the accessibility differences between. Adjusting process parameters, we have successfully coated 1.8 mm-tall VACNT arrays with a homogeneous thin (few nm) Al2O3 layer and were able to increase the depth at which, thick (few dozens of nm) Al2O3 coating is uniform from 20 to 350 μm. However, when VACNTs were functionalized, the penetration depth was found to correlate negatively with center oxygen content. These results, indicating diffusion as a rate-setting step in complex topography coatings, can significantly improve deposition quality and enhance the performance of thin-film applications such as membranes, sensors, and electrodes for energy harvesting and storage.

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Section: Resultsmentioning

confidence: 99%

Section: Process Parametermentioning

confidence: 99%

Alumina Thin-Film Deposition on Rough Topographies Comprising Vertically Aligned Carbon Nanotubes: Implications for Membranes, Sensors, and Electrodes

Rovinsky

Barick

Lieberman

et al. 2020

ACS Appl. Nano Mater.

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“…This architecture allows the use of these materials in different applications, including field emission, energy storage, nanoelectronics, or sensing. Although different methods of synthesis can be used, chemical vapor deposition (CVD) is considered the method that allows the greatest control of the process, leading to better results [21,22]. In fact, when the goal is to carry out patterned growth of vertically aligned SWNTs (VA-SWNTs), alcohol catalytic CVD (AC-CVD) is one of the techniques of choice.…”

Section: Introductionmentioning

confidence: 99%

Synthesis Procedure of Highly Densely Packed Carbon Nanotube Forests on TiN

et al. 2019

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The goal of this research was to obtain high-density single-walled carbon nanotube forests (SWNTs) on conductive substrates for different applications, including field emission. For this, dip-coating was chosen as the catalyst deposition method, to subsequently grow SWNTs by Alcohol Catalytic Chemical Vapor Deposition (AC-CVD). Si (100) was chosen as the substrate, which was then coated with a TiN thin film. By sputtering with Ar, it was possible to generate alternating TiN and Si lanes, with a different wettability and, therefore, a different affinity for the catalysts. As a result, the Mo‒Co catalyst was mainly deposited on TiN and not on sputtered-Si, which allowed the selective growth of SWNT forests on the TiN conductive surfaces. These as-synthesized SWNTs were used for field emission measurements in a high vacuum chamber.

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“…Además, utilizando este material se pueden fabricar pantallas flexibles, sensores electroquímicos, antenas RF, celdas solares y dispositivos de almacenamiento de energía. El desarrollo de ese tipo de dispositivos es una de las aplicaciones en las que destacan los NTC y otros materiales a base de carbono [9], [10], [11]. Sus características y propiedades pueden controlarse dependiendo de las aplicaciones en las que se los quiere utilizar.…”

Section: Introductionunclassified

Modificación de la conductividad eléctrica de tinta comercial para impresión inkjet utilizando nanotubos de carbono multipared

Pantoja-Suárez

Urquiza

Hernández-Chulde³

et al. 2019

RITI

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Resumen: La conductividad eléctrica de la tinta comercial de color negro fue modificada al introducir nanotubos de carbono (NTC) multipared en porcentajes de 0,5 hasta 1,5% en peso. Los grupos carboxílicos, presentes en la superficie de los NTC, fueron suficientes para que la dispersión de las nanoestructuras fuera adecuada en la tinta. Además, no se distinguió incompatibilidad entre los NTC y los componentes de la tinta. De hecho, se pudo constatar una sinergia entre el pigmento negro y los NTC. La aplicación de la tinta utilizando el bolígrafo corrector modificado permitió obtener líneas uniformes sobre papel ordinario a base de fibras de celulosa y sobre papel fotográfico. Los patrones dibujados a mano que mejor conductividad presentaron fueron aquellos realizados sobre papel ordinario y cuyo contenido de NTC fue igual o superior al 1% en peso.

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Growth of Aligned Carbon Nanotubes and Their Applications

Cited by 7 publications

References 93 publications

Alumina Thin-Film Deposition on Rough Topographies Comprising Vertically Aligned Carbon Nanotubes: Implications for Membranes, Sensors, and Electrodes

Alumina Thin-Film Deposition on Rough Topographies Comprising Vertically Aligned Carbon Nanotubes: Implications for Membranes, Sensors, and Electrodes

Synthesis Procedure of Highly Densely Packed Carbon Nanotube Forests on TiN

Modificación de la conductividad eléctrica de tinta comercial para impresión inkjet utilizando nanotubos de carbono multipared

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