Support materials based on converted aluminum films for chemical vapor deposition growth of single-wall carbon nanotubes

Hongo, Hiroo; Nihey, Fumiyuki; Ichihashi, T.; Ochiai, Yukinori; Yudasaka, Masako; Iijima, Sumio

doi:10.1016/j.cplett.2003.08.103

Cited by 56 publications

(39 citation statements)

References 12 publications

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“…Without the top Al 2 O 3 layer, only disordered SWNTs could be deposited in most cases, which is in agreement with the research results of Hongo et al who used c-alumina (converted from evaporated aluminum film by boiling it in de-ionized water for 1 h) as a catalyst supporter. [25] This confirms that the thin top Al 2 O 3 coating plays a very important role in the aligned growth of extremely dense SWNTs. The reasonable explanation is that the top Al 2 O 3 coating can dramatically increase the surface diffusion barrier of catalytic atoms so that the aggregation of Fe by surface diffusion into relatively large particles can be efficiently suppressed during the low temperature preheating period and, consequently, extremely dense nanocatalytic particles are formed on the substrates.…”

supporting

confidence: 75%

Very High Yield Growth of Vertically Aligned Single-Walled Carbon Nanotubes by Point-Arc Microwave Plasma CVD

Zhong¹,

Iwasaki

Honda

et al. 2005

Chem. Vap. Deposition

100

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supporting

confidence: 75%

Very High Yield Growth of Vertically Aligned Single-Walled Carbon Nanotubes by Point-Arc Microwave Plasma CVD

Zhong¹,

Iwasaki

Honda

et al. 2005

Chem. Vap. Deposition

100

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“…Because of the weak catalyst-substrate adhesion the catalyst particles then arise as the CNTs continue to grow from the substrate, and they finally appear at the tips of CNTs. [21][22][23] In addition to the catalytic activity, i.e., adsorption and dissociation of hydrocarbon precursors, the size of catalyst nanoparticles plays a key role in CNT growth. Previous studies have explored methods to improve catalyst efficiency for enhancing nanotube yields and growth of CNTs on metal contacts including the use of bimetallic catalysts 17,18 and multimetal layers.…”

Section: Introductionmentioning

confidence: 99%

Comparison study of catalyst nanoparticle formation and carbon nanotube growth: Support effect

Wang

Luo

et al. 2007

Journal of Applied Physics

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A comparison study has been conducted on the formation of catalyst nanoparticles on a high surface tension metal and low surface tension oxide for carbon nanotube (CNT) growth via catalytic chemical vapor deposition (CCVD). Silicon dioxide (SiO2) and tantalum have been deposited as supporting layers before deposition of a thin layer of iron catalyst. Iron nanoparticles were formed after thermal annealing. It was found that densities, size distributions, and morphologies of iron nanoparticles were distinctly different on the two supporting layers. In particular, iron nanoparticles revealed a Volmer-Weber growth mode on SiO2 and a Stranski-Krastanov mode on tantalum. CCVD growth of CNTs was conducted on iron∕tantalum and iron∕SiO2. CNT growth on SiO2 exhibited a tip growth mode with a slow growth rate of less than 100nm∕min. In contrast, the growth on tantalum followed a base growth mode with a fast growth rate exceeding 1μm∕min. For comparison, plasma enhanced CVD was also employed for CNT growth on SiO2 and showed a base growth mode with a growth rate greater than 2μm∕min. The enhanced CNT growth rate on tantalum was attributed to the morphologies of iron nanoparticles in combination with the presence of an iron wetting layer. The CNT growth mode was affected by the adhesion between the catalyst and support as well as CVD process.

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“…For example, the controlled preparations of catalyst metal particles of Fe, Fe/Mo, and Ni supported by MgO, Al, Al 2 O 3 , and Al oxides converted from Al films have been carried out. [14][15][16][17][18][19] Nevertheless, the correlation between the morphology of catalyst nanoparticles and the yield of SWNTs has not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

Growth of Single-Walled Carbon Nanotubes Rooted from Fe/Al Nanoparticle Array

Wongwiriyapan

Katayama

Ikuno

et al. 2005

Jpn. J. Appl. Phys.

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We explored the growth of single-walled carbon nanotubes (SWNTs) from nanoparticle array made of an Fe/Al multilayer catalyst by thermal chemical vapor deposition. Fe nanoparticles with a high number density and a narrow size distribution (1-5 nm) were efficiently formed by annealing the Fe/Al thin layer, resulting in the high-yield growth of SWNTs. Moreover, it was found that isolated SWNTs are rooted from patterned Fe/Al islands. The SWNTs bridged between electrodes exhibited semiconducting and metallic properties.

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Support materials based on converted aluminum films for chemical vapor deposition growth of single-wall carbon nanotubes

Cited by 56 publications

References 12 publications

Very High Yield Growth of Vertically Aligned Single-Walled Carbon Nanotubes by Point-Arc Microwave Plasma CVD

Very High Yield Growth of Vertically Aligned Single-Walled Carbon Nanotubes by Point-Arc Microwave Plasma CVD

Comparison study of catalyst nanoparticle formation and carbon nanotube growth: Support effect

Growth of Single-Walled Carbon Nanotubes Rooted from Fe/Al Nanoparticle Array

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