TEM studies of the initial stage growth and morphologies of bamboo-shaped carbon nanotubes synthesized by CVD

He, Chunnian; Zhao, Naiqin; Shi, Chunsheng; Du, Xi‐Wen; Li, Jiajun

doi:10.1016/j.jallcom.2006.06.050

Cited by 12 publications

(9 citation statements)

References 13 publications

(17 reference statements)

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“…They distinguished a "collective" type of CNT growth and "onion" type carbon nano-fiber growth. This layering is similar to the case shown in Figure 6, taken from the work of He et al [20]. This study helps to understand the sintering-like changes at the surface of solid particles, facilitated at nano scale.…”

Section: Alternative Routes and Shapessupporting

confidence: 84%

Explaining Bamboo-Like Carbon Fiber Growth Mechanism: Catalyst Shape Adjustments above Tammann Temperature

Lobo

Carabineiro

2020

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The mechanism of bamboo-like growth behavior of carbon fibers is discussed. We propose that there is a requirement to have this type of growth: operation above the Tammann temperature of the catalyst (defined as half of the melting point). The metal nanoparticle shape can then change during reaction (sintering-like behavior) facilitating carbon nanotube (CNT) growth, adjusting geometry. Using metal nanoparticles with a diameter below 20 nm, some reduction of the melting point (mp) and Tammann temperature (TTa) is observed. Fick’s laws still apply at nano scale. In that range, distances are short and so bulk diffusion of carbon (C) atoms through metal nanoparticles is quick. Growth occurs under catalytic and hybrid carbon formation routes. Better knowledge of the mechanism is an important basis to optimize growth rates and the shape of bamboo-like C fibers. Bamboo-like growth, occurring under pyrolytic carbon formation, is excluded: the nano-catalyst surface in contact with the gas gets quickly “poisoned”, covered by graphene layers. The bamboo-like growth of boron nitride (BN) nanotubes is also briefly discussed.

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Section: Alternative Routes and Shapessupporting

confidence: 84%

Explaining Bamboo-Like Carbon Fiber Growth Mechanism: Catalyst Shape Adjustments above Tammann Temperature

Lobo

Carabineiro

2020

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“…SEM and corresponding TEM images of MWCNT grown using hematite particles as catalyst; lines: a) HeSi −2 ; b) HeSi −3 . He et al, 2007;Sengupta and Jacob, 2010). Similarly, as observed by Zhang et al (2007), the TEM/SEM images revealed the presence of iron particles mostly on the tips of the observed CNT.…”

Section: Cnt Grown Using Pure Synthetic Hematite Particlessupporting

confidence: 76%

Nontronites as catalyst for synthesis of carbon nanotubes by catalytic chemical vapor deposition.

Kavecký

Valúchová

Čaplovičová

et al. 2015

Applied Clay Science

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“…Previously [21][22][23], we have fabricated the Ni/Al catalyst using a precipitation route. Here we also used this process but excess NaOH (till the pH value of the solution arrived at 10) to produce binary colloid Ni(OH)2/Al(OH)3 (weight ratio Ni/Al = 1/9).…”

Section: Methodsmentioning

confidence: 99%

Synthesis of carbon nanohorns by the simple catalytic method

Zhao

Wang

et al. 2009

Journal of Alloys and Compounds

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TEM studies of the initial stage growth and morphologies of bamboo-shaped carbon nanotubes synthesized by CVD

Cited by 12 publications

References 13 publications

Explaining Bamboo-Like Carbon Fiber Growth Mechanism: Catalyst Shape Adjustments above Tammann Temperature

Explaining Bamboo-Like Carbon Fiber Growth Mechanism: Catalyst Shape Adjustments above Tammann Temperature

Nontronites as catalyst for synthesis of carbon nanotubes by catalytic chemical vapor deposition.

Synthesis of carbon nanohorns by the simple catalytic method

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