Behavior of catalytic nanoparticles during chemical vapor deposition for carbon nanotube growth

Jeong, Goo‐Hwan; Yamazaki, Akira; Suzuki, Satoru; Kobayashi, Yoshihiro; Homma, Yoshikazu

doi:10.1016/j.cplett.2006.02.030

Cited by 30 publications

(34 citation statements)

References 29 publications

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“…Some experiments gave the evidence that metal nanoparticles could be embedded under the amorphous surface [27,28]. For quartz supported surfaces, a weaker metal-support interaction is expected to lead to the formation of larger metal particles.…”

Section: Resultsmentioning

confidence: 99%

“…The size of catalyst nanoparticles can be increased by the continued agglomeration of small catalyst particles during the CVD process or the enhanced diffusion along the growing nanotube surface [29]. Simultaneously, the dissolution of carbon atoms in the particles and the formation of amorphous carbon or a graphitic carbon shell from excessive carbon species covering on the Co nanoparticle surface could also give rise to the increase of nanoparticle size [24,27,30].…”

Section: Resultsmentioning

confidence: 99%

“…1(a)] which constantly affect the stability of the AFM tips, it was not possible to resolve the SWNTs unambiguously and confirm a clear particle-tube relationship of the silica sample by AFM. However, based on the fact that, the catalytic nanoparticle size gives the upper bound for the nanotube diameter [24,27,29], we could expect here that, base on the Co nanoparticle size distribution, the diameters of SWNTs on our thermal SiO 2 surface should show slightly smaller diameter than that on quartz.…”

Section: Resultsmentioning

confidence: 99%

“…To explain the discrepancy, we provide several possibilities for the Co catalyst behaviors on the silica: (i) presence of invisible small atomic clusters by AFM on the silica surface with evident roughness (see Fig. 3(a)); (ii) embedment of Co atoms or small clusters under the surface [27,28]; (iii) re-vaporization of small size nanoparticles at the high temperature. Figure 4 gives a general comparison of Co nanoparticle size distribution between samples after CVD process and samples treated in Ar/H 2 gas corresponding to Figs.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

A Comparative Study of Cobalt Catalyst Behavior between Silica and Quartz Substrates for Single-Walled Carbon Nanotube Growth

Xie

Inaba

Yamada

et al. 2011

e-J. Surf. Sci. Nanotechnol.

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The cobalt (Co) catalyst behavior for SWNT growth on thermal oxidized silica and single-crystalline quartz by using alcohol chemical vapor deposition (CVD) was compared. The influence of the nature of substrate surface was analyzed from the size and density of both catalyst nanoparticles and SWNTs. The Co nanoparticles, on the quartz substrate after growth, had a mean diameter of about 5.9 nm which was larger than that (2.1 nm) on the silica substrate. Randomly dispersed SWNTs with a higher density were obtained on silica, while aligned SWNTs with a lower density were achieved on ST-cut quartz. The lower density of the nanoparticles on the quartz substrate can be attributed to a larger surface diffusion length of Co atoms in comparison with the silica surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A Comparative Study of Cobalt Catalyst Behavior between Silica and Quartz Substrates for Single-Walled Carbon Nanotube Growth

Xie

Inaba

Yamada

et al. 2011

e-J. Surf. Sci. Nanotechnol.

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“…After a brief rinsing and drying, the substrates were air-annealed at 450°C for 15 min to remove the mineral shell of the ferritin, which produces iron oxide in the form of hematite. [16] To further control the nanoparticle size, the annealing at 900°C is performed for 10, 30, and 60 min in a reduction and oxidation environment for Fe and Au nanoparticles, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effect of catalytic metals on diameter-controlled growth of single-walled carbon nanotubes: Comparison between Fe and Au

Lee

Jeong

2012

Electron. Mater. Lett.

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We investigated the effect of catalytic metals on diameter-controlled growth of single-walled carbon nanotubes (SWNTs) using different catalytic nanoparticles. We chose Fe and Au nanoparticles as catalysts for the growth of the SWNTs and compared the experimental results in terms of the diameter control of the SWNTs. Since there is a size relationship between SWNTs and catalysts, our approach involved controlling the size of the catalytic nanoparticles. First, the Fe and Au nanoparticles were monodispersed onto quartz substrates by optimizing the spincasting conditions and were subsequently thermally annealed in order to evaporate the nanoparticles. With the same annealing treatment at 900°C, it was found that the average diameter of the Au decreased more rapidly than that of the Fe nanoparticles. Finally, thin SWNTs were obtained with a much narrower diameter distribution from the evaporated Au nanoparticles than were obtained from the evaporated Fe nanoparticles.

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Metallic Catalysts for Structure-Controlled Growth of Single-Walled Carbon Nanotubes

Liu

Zhao

et al. 2017

Top Curr Chem (Z)

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Single-walled carbon nanotubes (SWNTs) have shown great potential in various applications attributed to their unique structures and outstanding structure-dependent properties. The structure-controlled growth of SWNTs is a crucial issue for their advanced applications and has been a great challenge in this field for two decades. Metal catalyst-mediated SWNT growth is believed to be very efficient. In this review, progresses in diameter and chirality controlled growth of SWNTs with metal catalysts is summarized from several aspects, including growth mechanism and theory, effects of catalysts, and the chemical vapor deposition conditions. The design, preparation, handling and dispersion, and the size evolution of metal catalysts are all discussed. The influences of growth environment including the type, composition, and pressure/concentration of the carbon source as well as the temperature on the selectivity toward the nanotube structure are analyzed. We also discuss some of the challenges and trends in this field.

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Behavior of catalytic nanoparticles during chemical vapor deposition for carbon nanotube growth

Cited by 30 publications

References 29 publications

A Comparative Study of Cobalt Catalyst Behavior between Silica and Quartz Substrates for Single-Walled Carbon Nanotube Growth

A Comparative Study of Cobalt Catalyst Behavior between Silica and Quartz Substrates for Single-Walled Carbon Nanotube Growth

Effect of catalytic metals on diameter-controlled growth of single-walled carbon nanotubes: Comparison between Fe and Au

Metallic Catalysts for Structure-Controlled Growth of Single-Walled Carbon Nanotubes

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