Carbon nanotube growth mechanism switches from tip- to base-growth with decreasing catalyst particle size

Gohier, A.; Ewels, Christopher P.; Minéa, T.; Djouadi, M. A.

doi:10.1016/j.carbon.2008.05.016

Cited by 268 publications

(157 citation statements)

References 34 publications

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“…These characteristics are associated with the growth mechanism like tip. 29,30 The particles inside of the nanotubes seem to cause a variation in their diameter according to the particle position of nanotube to finally originate a bamboo-like appearance. ACNTs diameter was between 70 nm and 120 nm according to the observations made by TEM studies.…”

Section: Resultsmentioning

confidence: 99%

Dynamically Configurable Nonlinear Optical Switching Based on Vertically Aligned Carbon Nanotubes

et al. 2016

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The modification of the third order nonlinear optical response exhibited by vertically aligned carbon nanotubes in two-wave mixing interactions was analyzed. All-optical switching effects were explored by using a vectorial optical Kerr gate with nanosecond pulses at 532 nm wavelength of excitation. The samples were prepared by a spray pyrolysis method. Morphological and structural characterization of the samples was conducted by Scanning Electron Microscopy, Transmission Electron Microscopy and Raman Spectroscopy studies. Important structural changes dependent on the temperature employed for the preparation of the carbon nanotubes were observed. It was highlighted a remarkable influence of nonlinear energy transference in spatially-resolved optical processes for designing ultrafast lowdimensional devices.

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Section: Resultsmentioning

confidence: 99%

Dynamically Configurable Nonlinear Optical Switching Based on Vertically Aligned Carbon Nanotubes

et al. 2016

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“…15,34 Moreover, the growth mechanism was shown to shift between tip growth and base growth based on the diameter of the catalyst nanoparticle. 35 Previously, backscatter-electron imaging was used to show that there are no traces of metal nanoparticles on the top of grown CNT forests, 36 to confirm the base-growth process for Fe nanoparticle catalysts on aluminum oxide support layers. The rest of this article will focus on studying this catalyst system.…”

Section: Catalyst Preparation and Treatmentmentioning

confidence: 99%

Data-driven understanding of collective carbon nanotube growth by in situ characterization and nanoscale metrology

Bedewy

2016

J. Mater. Res.

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Aligned carbon nanotubes (CNTs) possess great potential for transforming the fabrication of advanced interfacial materials for energy and mass transport as well as for structural composites. Realizing this potential, however, requires building a deeper understanding and exercising greater control on the atomic scale physicochemical processes underlying the bottom-up synthesis and self-organization of CNTs. Hence, in situ nanoscale metrology and characterization techniques were developed for interrogating CNTs as they grow, interact, and self-assemble. This article presents an overview of recent research on characterization of CNT growth by chemical vapor deposition (CVD), organized into three categories based on the growth stage, for which each technique provides information: (I) catalyst preparation and treatment, (II) catalytic activation and CNT nucleation, and (III) CNT growth and termination. Combining all three categories together provides insights into building the process-structure relationship, and paves the way for producing tailored CNT structures having desired properties for target applications.

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“…While a weak contact favours tip-growth mechanism, a strong interaction promotes basegrowth (Bower et al, 2000;Song et al, 2004). However, Gohier et al (2008) dispute the notion of adhesion forces between the catalyst particle and the substrate as controlling growth mechanism. Instead, they propose the catalyst particle size, and the 'carbon diffusion paths' during CNT nucleation as the main determinants for controlling the growth mechanism.…”

Section: Growth Mechanismsmentioning

confidence: 99%

Synthesis of Carbon Nanomaterials in a Swirled Floating Catalytic Chemical Vapour Deposition Reactor for Continuous and Large Scale Production

Iyuke¹,

Simate²

2011

Carbon Nanotubes - Growth and Applications

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Carbon nanotube growth mechanism switches from tip- to base-growth with decreasing catalyst particle size

Cited by 268 publications

References 34 publications

Dynamically Configurable Nonlinear Optical Switching Based on Vertically Aligned Carbon Nanotubes

Dynamically Configurable Nonlinear Optical Switching Based on Vertically Aligned Carbon Nanotubes

Data-driven understanding of collective carbon nanotube growth by in situ characterization and nanoscale metrology

Synthesis of Carbon Nanomaterials in a Swirled Floating Catalytic Chemical Vapour Deposition Reactor for Continuous and Large Scale Production

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