Control of diameter distribution of single-walled carbon nanotubes using the zeolite-CCVD method at atmospheric pressure

Okamoto, Atsuto; Shinohara, Hisanori

doi:10.1016/j.carbon.2004.10.006

Cited by 75 publications

(41 citation statements)

References 31 publications

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“…These radicals are assumed to prevent the formation of amorphous carbon during the growth . Ever since the study of Maruyama et al, the synthesis of CNTs from alcohols was intensively investigated . Li et al addressed the CNT deposition starting from methanol, ethanol, isopropanol, and hexanol at temperatures above 1000 °C using high flow rates of H 2 as a reactive gas .…”

Section: Introductionmentioning

confidence: 99%

Low‐Temperature Thermal CVD of Superblack Carbon Nanotube Coatings

Basheer

Pachot

Lafont

et al. 2017

Adv Materials Inter

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The deposition of carbon nanotube (CNT) coatings via thermal chemical vapor deposition (CVD) is intensively reported. The surface acidity, chemical nature of the catalytic nanoparticles, and the carbon precursor are highly inter‐related key parameters. Furthermore, reducing the typical high‐growth temperature requires the implementation of toxic and hazardous organic precursors. In this study, the growth of CNT coatings is demonstrated using a single‐step CVD process in which magnesium oxides, material with enhanced basicity, and nanoparticles of cobalt are codeposited. This deposit catalyzes simultaneously the decomposition of ethanol to spark the growth of CNTs. The deposition is successively performed at 330–500 °C. Grown CNTs below 400 °C feature a high defect concentration and large diameters, 20 nm, relative to those obtained at ≥400 °C with no apparent defects and diameter of 12 nm. In terms of optical properties, films grown at ≥400 °C reflect less than 0.5% of light in the UV–vis–near IR, and exhibit a Lambertian behavior. Furthermore, the bidirectional reflectance distribution function measurements reveal identical optical properties irrespective of the underlying substrate. Therefore, the process holds a great potential for applications involving stray light reduction.

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Section: Introductionmentioning

confidence: 99%

Low‐Temperature Thermal CVD of Superblack Carbon Nanotube Coatings

Basheer

Pachot

Lafont

et al. 2017

Adv Materials Inter

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“…Using these calculations, it became possible to estimate the relative abundance of individual tubes in an SWNTsample. While comparing with the experimental results, Oyama et al also reported another significant outcome, in which contrary to the generally assumed peaked diameter distribution in any synthesized SWNT sample, [14][15][16][17][18][19][20][21][22] SWNT abundances were found to be very widely-scattered when plotted as a function of diameter. 13 Angular diagram of the graphene sheet provides a map of the nanotubes indicating all possible chiralities (n m).…”

Section: Introductionmentioning

confidence: 77%

Is the Diameter or Chirality Distribution of Single-Walled Carbon Nanotubes Selected in the Synthesis Process?

Bhattacharyya¹,

Suda²,

Okita³

et al. 2009

J. Nanosci. Nanotech.

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Based on recent theoretical photoluminescence intensity calculations, the population densities of sixteen semiconducting single-walled carbon nanotubes grown by alcohol catalytic chemical vapor deposition were estimated for two different temperatures. The profiles of population density merely as functions of tube-diameter or chiral angle are found to be widely scattered. However, systematic profiles are detectable when separately split into (2n + m), (n + 2m) and (n - m) family arrays. Apart from these well-knit family behaviors, the population densities of the group of nanotubes forming another three possible series [viz. constant-n, constant-m and constant-(n + m)] also show evidence of good correlations. Hence, a two-dimensional chiral-zone selective growth principle is hypothesized.

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“…Experiments were carried out in atmospheric pressure. Impregnated Y‐zeolite powders with iron acetate and cobalt acetate tetrahydrate are adopted as catalyst for CNT formation . The stainless‐steel grid (SUS 304, #100, 2.5 × 2.5 mm 2 ) coated with the catalyst powders is put in the fuel side near the flame.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Investigation of applying DC electric field effect on carbon nanotube synthesis

Masunaga

Ito

Fujita

2012

Asia-Pacific J Chem Eng

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Flame synthesis is focused as a carbon nanotube (CNT) formation method in the present study. Although promotion of CNT formation by applying electric field to flame synthesis method has been reported, it is difficult to distinguish whether the promotion of CNT growth is caused by the effect of electric field on the condition near the flame or whether it is caused by other effects accompanied with electric field application so far. Therefore, the influence of the change in condition near the flame accompanied with the DC electric field application on the CNT formation was analyzed in this study. Moreover, the effect of the electric field application on the CNT growth rate and the carbon processing rate on the catalyst was investigated in the chemical vapor deposition method. In the flame synthesis method, the significant promotion of CNT growth is observed, whereas there is less effect of the electric field on the condition such as gas temperature and composition. In the chemical vapor deposition method, the CNT length increases with increasing the intensity of the electric field. Moreover, extension of the catalyst lifetime and increase in the CNT growth rate are found with applying the electric field.

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Control of diameter distribution of single-walled carbon nanotubes using the zeolite-CCVD method at atmospheric pressure

Cited by 75 publications

References 31 publications

Low‐Temperature Thermal CVD of Superblack Carbon Nanotube Coatings

Low‐Temperature Thermal CVD of Superblack Carbon Nanotube Coatings

Is the Diameter or Chirality Distribution of Single-Walled Carbon Nanotubes Selected in the Synthesis Process?

Investigation of applying DC electric field effect on carbon nanotube synthesis

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