Revealing the Secret of Water-Assisted Carbon Nanotube Synthesis by Microscopic Observation of the Interaction of Water on the Catalysts

Yamada, Takeo; Maigné, Alan; Yudasaka, Masako; Mizuno, Kouhei; Futaba, Don N.; Yumura, Motoo; Iijima, Sumio; Hata, Kenji

doi:10.1021/nl801981m

Cited by 193 publications

(195 citation statements)

References 27 publications

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“…The need to replenish oxygen at the substrate surface would offer an additional explanation for the role of H 2 O in the supergrowth of CNTs. 31,32 …”

Section: Resultsmentioning

confidence: 99%

Investigating the Outskirts of Fe and Co Catalyst Particles in Alumina-Supported Catalytic CVD Carbon Nanotube Growth

et al. 2010

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Using thermal CVD, the synthesis of multi-walled carbon nanotubes exhibiting roots anchored directly onto ␣-alumina supports, rather than the catalyst particle, is reported. At such roots, the alignment of the graphitic planes with the support lattice fringes depends on the support crystal structure and orientation.Surface defects may alter the reactivity of the surface or control the anchoring of supported atoms or nanoparticles.We argue this surface defect is provided by the catalyst particle's edge interaction with the support, in other words its circumference. The development of oxide-based catalysts is attractive in that they potentially provide an appropriate solution to directly integrate the synthesis of carbon nanotubes and graphene into silicon-based technology.

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“…The need to replenish oxygen at the substrate surface would offer an additional explanation for the role of H 2 O in the supergrowth of CNTs. 31,32 …”

Section: Resultsmentioning

confidence: 99%

Investigating the Outskirts of Fe and Co Catalyst Particles in Alumina-Supported Catalytic CVD Carbon Nanotube Growth

et al. 2010

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“…The difference between linear and exponential growth prior to sudden termination is rather small [15] and can easily be missed if sampling rates are too low. The slow growth rate decay, which, at least in the absence of water vapor, is thought to arise from carbon coatings that render seed nanoparticles inactive [34]. The sudden termination suggests that the terminal height H t likely originates from a different mechanism.…”

Section: Resultsmentioning

confidence: 99%

Distinct termination morphologies for vertically aligned carbon nanotube forests

et al. 2009

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Distinct termination morphologies for vertically aligned carbon nanotube forests Vinten, P.; Marshall, P.; Lefebvre, J.; Finnie, P.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. Abstract Vertically aligned carbon nanotube forests, including single-walled nanotubes, are imaged optically as they grow in situ from cobalt/alumina catalyst using water-assisted acetylene chemical vapor deposition. Three distinct termination morphologies are identified and investigated optically and via scanning electron microscopy. Quantitative growth dynamics are extracted and show gradual deceleration and sudden termination of growth. The termination morphology is discussed in terms of the balance of forces within the forest. We speculate that sudden termination is a collective effect arising from an imbalance in these forces.

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“…Figure 4 shows the yields of the synthesized MWCNTs fitted with a curve (red dashed line), which has a high goodness of fit (correlation Figure 4 shows a TEM image of encapsulated iron at the tip of a MWCNT that originated from partial encapsulation of the catalyst by a carbon layer, which inhibited further reaction (Yamada et al 2008). The MWCNT yield increased within a short reaction time, reaching a maximum at 20 min.…”

Section: Synthesis Of Sio 2 Particles With Embedded Mwcntsmentioning

confidence: 95%

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Tulaphol

Bunsan²,

Kanchanatip

et al. 2016

Int. J. Environ. Sci. Technol.

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Multi-walled carbon nanotubes (MWCNTs) embedded in SiO 2 particles were prepared through the floating-catalyst chemical vapor deposition method. The parameters reaction time and flow rate of the carbon source (CH 4 ) were studied to obtain optimum conditions for MWCNT synthesis. The obtained MWCNTs were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy to confirm their morphology and crystallinity. The optimum conditions were a CH 4 flow rate of 100 ml/min in a H 2 -Ar mixture at a flow rate of 500 ml/min and a reaction time of 20 min. Under these conditions, MWCNTs with average outer and inner diameters of around 50 and 10 nm, respectively, were obtained. SiO 2 particles with embedded MWCNTs were studied for their adsorption of gaseous chlorinated phenolic compounds (CPCs), with emphasis on the effect of number of chlorine substituents. The CPC compounds of 2-chlorophenol (CP) and 2,4-dichlorophenol (DCP) were compared against phenol (P). Adsorption of P and CPCs on the particles fit well the Langmuir isotherm. The adsorption capacities of P, CP, and DCP on SiO 2 particles with embedded MWCNTs were found to be 3.12, 13.83, and 44.25 mg/g, respectively. Desorption activation energy was determined by thermogravimetric analysis. Chlorine substitution on P changed the adsorption process from physical to chemical adsorption. The particles showed high potential for use as a pre-concentration unit for solid-phase microextraction.

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Revealing the Secret of Water-Assisted Carbon Nanotube Synthesis by Microscopic Observation of the Interaction of Water on the Catalysts

Cited by 193 publications

References 27 publications

Investigating the Outskirts of Fe and Co Catalyst Particles in Alumina-Supported Catalytic CVD Carbon Nanotube Growth

Investigating the Outskirts of Fe and Co Catalyst Particles in Alumina-Supported Catalytic CVD Carbon Nanotube Growth

Distinct termination morphologies for vertically aligned carbon nanotube forests

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

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