Synthesis of single- and double-walled carbon nanotubes by catalytic decomposition of methane

Liu, B.C.; Lyu, Seung Chul; Lee, T.J.; Choi, Sung‐Yool; Eum, Sung Jin; Yang, Cheol‐Woong; Park, C.Y.; Lee, C.J.

doi:10.1016/s0009-2614(03)00636-5

Cited by 58 publications

(28 citation statements)

References 20 publications

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“…This is line with the corresponding increase in carbon content, lower than could be expected (Figure 1a). However, when a distinction is made between the average diameters of SWCNTs and DWCNTs (Figure 7), it is interesting to note that for G3R, the SWCNTs average diameter is 0.5 nm higher than the DWCNTs average diameter, which is clearly uncommon as many authors stress that DWCNT are larger than SWCNT 19,28,29,45 This could be related to the transition in number of walls selectivity occurring between G2R and G3R (Figure 5b, c). A first hypothesis would be that this transition could reflect the higher proportion of larger nanoparticles.…”

Section: Resultsmentioning

confidence: 97%

“…Thus, DWCNTs are produced alongside SWCNTs and fine-tuning the experimental conditions allows one to make DWCNTs the major product. 19,[22][23][24][25][26][27][28][29][30][31] Results have been reported regarding the influence of the synthesis parameters such as catalytic material composition, 32-36 , catalyst particle size, 24, 37-43 carbon source flow rate [44][45][46] and temperature. [22][23][24]45 Conflicting results are reported, which is possibly due in part to the fact that the many experimental parameters are not independent.…”

Section: And That Functionalizedmentioning

confidence: 99%

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Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

et al. 2015

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Samples containing a majority of either single-wall carbon nanotubes (SWCNTs) or doublewalled carbon nanotubes (DWCNTs) are prepared in the same catalytic chemical vapor deposition conditions but using slightly different catalytic materials, based on alumina impregnated with iron and molybdenum salts.There is a sharp SWCNTs-to-DWCNTs transition. By contrast to the usual findings, the selectivity is not correlated to the size of the iron-based catalyst nanoparticles, nor does the transition occur upon a decreasing carbon/catalyst ratio. The result is attributed to the increasing MoO 3 concentration inducing modifications of the gas atmosphere, such as the formation of more reactive C 2 species through C 2 H 4 dissociation, which thus favors the nucleation and growth of a DWCNT. In the DWCNT sample, the average diameter of the SWCNTs is higher than the average outer diameter of the DWCNTs, which is uncommon as many authors stress that SWCNTs show a lower diameter than DWCNTs. The study could provide guidelines for the synthesis of very small diameter DWCNTs.

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Section: Resultsmentioning

confidence: 97%

Section: And That Functionalizedmentioning

confidence: 99%

Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

et al. 2015

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“…Then, the catalyst is placed in a quartz tube and kept in a furnace at 950°C in an Ar atmosphere. CH 4 and Ar are allowed to flow at rates of 100 and 500 sccm, respectively [48]. Scanning electron microscope (SEM) analysis (Fig.…”

Section: Using Methanementioning

confidence: 99%

Carbon-allotropes: synthesis methods, applications and future perspectives

Karthik¹,

Himaja²,

Singh³

2014

Carbon letters

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The element carbon has been used as a source of energy for the past few hundred years, and now in this era of technology, carbon has played a significant and very prominent role in almost all fields of science and technology. So as an honour to this marvellous element, we humans should know about its various forms of existence. In this review article, we shed light on all possible carbon-allotropes; similarities in their synthesis techniques and the starting materials; their wide range of possible availability; and finally, future perspectives and applications. A brief introduction is given on the types, structures, and shapes of the allotropes of carbon for a better understanding.

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“…The author reported that there was a strong dependence of nature of hydrocarbon precursors on the formation of different structure of CNTs. It was also reported that methane would be most preferable for the growth of high-purity SWNTs rather than any other gaseous hydrocarbons, as it was comparatively chemically stable at high temperature and has the simplest structure [48]. However, the achievement for the methane CVD growth of SWNTs would largely depend on the features of catalyst as well.…”

Section: Methane Cvdmentioning

confidence: 99%

“…Zhu et al [21] showed that addition of molybdenum (Mo/Co = 1/5) in an optimum level to Co/MgO catalysts (prepared by mechanical mixing and combustion synthesis with citric acid) yielded 10 time's higher generation of SWNTs and less amorphous carbon. Liu et al [48] studied the CCVD of methane over Fe-Mo/Al 2 O 3 catalyst. They reported that the yield of 70% SWNTs and 30% DWNTs are related to the weight of Fe-Mo metal in Fe-Mo/Al 2 O 3 .…”

Section: Promoters Some Of the Metals Like Molybdenum Boronmentioning

confidence: 99%

Role of Reaction and Factors of Carbon Nanotubes Growth in Chemical Vapour Decomposition Process Using Methane—A Highlight

Sivakumar

Mohamed

Abdullah

et al. 2010

Journal of Nanomaterials

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One of the remarkable achievements in the field of nanotechnology is Carbon Nanotubes (CNT) synthesis. Since their discovery in 1991 by Iijima, CNTs have attracted much attention across the world. The CNTs are broadly classified into single-walled carbon nanotubes (SWNTs) and multiwalled carbon nanotubes (MWNTs). The most distinguished features of SWNTs and MWNTs are their electrical, mechanical, chemical, and electronic properties which in turn find their potential applications in almost all fields of science, engineering, and technology. Based on the previous research studies to till date, chemical vapour deposition (CVD) is considered to be the simplest method with high energy efficiency and precise control of reaction parameters compared to other different methods for synthesizing CNTs. Since production of CNTs is becoming the most important factor in the applications point of view, most industries today are opting for the CVD technique. This paper reviewed the synthesis of CNT by CVD especially focusing on methane CVD. Various parameters influencing the reaction and CNT growth were also discussed. A detailed review was made over the different types of CVD process, influence of metal, supports, metal-support interaction, effect of promoters, and reaction parameters role in CNTs growth.

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Synthesis of single- and double-walled carbon nanotubes by catalytic decomposition of methane

Cited by 58 publications

References 20 publications

Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

Carbon-allotropes: synthesis methods, applications and future perspectives

Role of Reaction and Factors of Carbon Nanotubes Growth in Chemical Vapour Decomposition Process Using Methane—A Highlight

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