Comparison of structure and yield of multiwall carbon nanotubes produced by the CVD technique and a water assisted method

Bansal, Malti; Lal, C.; Srivastava, Ritu; Kamalasanan, M. N.; Tanwar, L. S.

doi:10.1016/j.physb.2010.01.031

Cited by 17 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak at $1370 cm À1 corresponds to the D-band and is attributed to the disorder mode of the sample, including the wall structure defects and the amorphous carbon deposition on the wall of the synthesized CNTs. Meanwhile, the peak at $1590 cm À1 corresponds to the G-band, which indicates the tangential stretching mode of a highly oriented hexagonal lattice of pyrolytic graphite, representing the degree of graphitization [22,23]. For all Raman spectra, both D-and G-bands were clearly visible.…”

Section: Methodsmentioning

confidence: 96%

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

Lee

Yeoh

Chai

et al. 2012

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 96%

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

Lee

Yeoh

Chai

et al. 2012

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

“…Based on this idea, a method so-called water assisted CVD was developed [82,83]. The truth of the promotion is that the mild oxidizer such as water helps to prevent amorphous carbon deposition on the surface of the catalyst [80,81], thus the poison of the catalyst is efficiently avoided.…”

Section: Gas Compositionmentioning

confidence: 99%

One-Dimensional Carbon Nanostructures: Low-Temperature Chemical Vapor Synthesis and Applications

Yang

Jiang

2016

Carbon Nanoparticles and Nanostructures

View full text Add to dashboard Cite

Chemical vapor deposition (CVD) is a powerful method to synthesize various carbon nanostructures (e.g., carbon nanotubes). A conventional CVD process has to be carried out at the temperatures over 600°C. To extend the applications of carbon nanostructures, for example in the semiconductor industry, low-temperature synthesis processes are thus always pursued. In this chapter we review the CVD growth of carbon nanostructures at low temperatures (<450°C). These growth processes are discussed in detail with respect to the applied catalyst system, carbon source, reaction atmosphere, catalyst faces, morphology control as well as unique structural characteristics of grown products. For the low-temperature CVD growth, catalytic reaction occurring on the low index faces of a metal catalyst is a crucial issue, and the growth is rate-limited by surface diffusion. Instead of the classical Vapor-Liquid-Solid (VLS) growth mechanism, the growth mechanism at low temperatures is interpreted with a novel Vapor-Facet-Solid (VFS) mechanism. Due to their unique features, the synthesized carbon nanostructures are promising to be applied for interconnects in large-scale integrated circuits, field emission, microwave adsorption, and as the anode material of lithium ion secondary battery, etc.

show abstract

“…Of these, the CVD technique has been the method commonly used for large-scale N-CNT synthesis [27]. However, the control of the reaction conditions in CVD technique is somewhat tricky, as catalyst poisoning due to limiting carbon diffusion rate and formation of amorphous carbon on Fe substrate surface is common [28,29]. Many researchers have reported the introduction of oxygen [30], water [31,32] and CO 2 [33], ethyl benzoate [34] among other reaction gases to improve N-CNTs quality and catalyst activity [35].…”

Section: Introductionmentioning

confidence: 99%

Effect of benzophenone on the physicochemical properties of N-CNTs synthesized from 1-ferrocenylmethyl (2-methylimidazole) catalyst

Labulo

Adesuji

Oseghale

et al. 2020

J. Nig. Soc. Phys. Sci.

View full text Add to dashboard Cite

Vertically-aligned nitrogen-doped carbon nanotubes (v-N-CNTs) were synthesized \textit{via} the chemical vapour deposition (CVD) technique. 1-ferrocenylmethyl(2-methylimidazole) was employed as the source of the Fe catalyst and was dissolved in different ratios of acetonitrile/benzophenone feedstock which served as both the carbon, nitrogen, and oxygen sources. The morphological difference in N-CNTs was as a result of increased oxygen concentration in the reaction mix and not due to water vapour formation as observed in the oxygen-free experiment, indicating specifically, the impact of oxygen. Raman and X-ray photoelectron spectroscopy (XPS) revealed surface defects and grafting of oxygen functional groups on the sidewall of N-CNTs. The FTIR data showed little or no effect as oxygen concentration increases. XPS analysis detected the type of nitrogen species (\textit{i.e.} pyridinic, pyrrolic, graphitic, or molecular nitrogen forms) incorporated in the N-CNT samples. Pyrrolic nitrogen was dominant and increased (from 8.6 to 11.8 at.\%) as oxygen concentration increases in the reaction precursor. An increase in N content was observed with the introduction of a lower concentration of oxygen, followed by a gradual decrease at higher oxygen concentration. Our result suggested that effective control of the reactant mixtures can manipulate the morphology of N-CNTs.

show abstract

Comparison of structure and yield of multiwall carbon nanotubes produced by the CVD technique and a water assisted method

Cited by 17 publications

References 27 publications

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

One-Dimensional Carbon Nanostructures: Low-Temperature Chemical Vapor Synthesis and Applications

Effect of benzophenone on the physicochemical properties of N-CNTs synthesized from 1-ferrocenylmethyl (2-methylimidazole) catalyst

Contact Info

Product

Resources

About