Change of tube diameter distribution of single-wall carbon nanotubes induced by changing the bimetallic ratio of Ni and Y catalysts

Takizawa, Morio; Bandow, Shunji; Yudasaka, Masako; Ando, Yoshinori; Shimoyama, Hiroshi; Iijima, Sumio

doi:10.1016/s0009-2614(00)00817-4

Cited by 69 publications

(55 citation statements)

References 22 publications

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“…This diameter dependence on the nanoparticle composition is observed in all high temperature reactors. Takizawa et al showed that the diameter increases with Y concentration [16]. In our case, the diameter of the SWCNTs is seen to increase with Ts (Fig.…”

Section: Resultssupporting

confidence: 65%

Synthesis of single‐walled carbon nanotubes with the laser vaporization method: Ex situ and in situ measurements

Cau

Dorval

Attal‐Trétout

et al. 2006

Physica Status Solidi (b)

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In situ measurements were executed in the continuous wave CO 2 -laser vaporization synthesis of singlewalled carbon nanotubes (SWCNTs). The results were compared with the findings of the ex situ analysis of the product. Different catalysts (Co, Ni, Co/Ni, Ni/Y and Co/Y) were used and the temperature of the target surface (T s ) changed to compare the efficiency of the synthesis process. Our main results are related to the SWCNTs diameter which is depending on T s and on the catalysts nature. The targets containing Y with Co or Ni atoms produce more and larger SWCNTs than Co/Ni targets. The SWCNTs' diameter is seen to increase with T s .

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Section: Resultssupporting

confidence: 65%

Synthesis of single‐walled carbon nanotubes with the laser vaporization method: Ex situ and in situ measurements

Cau

Dorval

Attal‐Trétout

et al. 2006

Physica Status Solidi (b)

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“…The tube diameter can be estimated by using a simple relation ω r = 224/d, where ω r is RBM Raman frequency (cm -1 ) and d is the tube diameter (nm) [20]. This relation allowed on the basis of measurement of Raman scattering intensities to calculate the diameter distribution of SWNTs in the sample [21]. It is unclear so far what the accuracy of the method is.…”

Section: Raman Scatteringmentioning

confidence: 99%

Perspectives of Single-Wall Carbon Nanotube Production in the Arc Discharge Process

Крестинин¹,

Киселев²,

Raevskii³

et al. 2017

Eurasian Chem. Tech. J.

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Single-wall carbon nanotubes (SWNTs) promise wide applications in many technical fields. As a result purified SWNT material is sold now on the West market at more than $1000 per 1 gram. Thus developing an effective technology for SWNTs production rises to a very important scientific problem. The perspectives of three existing methods providing raw material in the technology of SWNT production have been analyzed. They are i) pulsed laser evaporation of graphite/metal composites, ii) evaporation of graphite electrodes with metal content in the arc discharge process, and iii) catalytic decomposition of the mixture of CO and metal carbonyl catalyst precursor. The observed dynamics of SWNT market points to replacing the laser method of SWNTs production by the arc process. The conclusion has been made that the technology based on the arc process will be the major one for the fabrication of purified SWNTs at least for the next five years. A reliable estimation of a low price limit of SWNTs was derived from a comparison of two technologies based on the arc discharge process: the first one is the production of SWNTs and the second one is the production of a fullerene mixture С 60 + С 70 . The main conclusion was made that the price of purified SWNTs should always be more by 2-3 times the price of fullerene mixture. The parameters of a lab-scale technology for the production of purified SWNTs are listed. A large-scale application of the developed technology is expected to reduce the price of purified SWNTs by approximately ten times. The methods now employed for the characterization of products containing SWNTs are briefly observed. It is concluded that electron microscopy, thermogravimetric analysis, absorption and Raman spectroscopy, measurement of the specific surface aria, optical microscopy -each in separation is not enough for extensive characterization of a sample containing SWNTs, and all these methods should be used together.

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“…The first two methods impose problems in scaling up the production up to industrial level while the chemical vapour deposition (CVD) method offers the best hope for large scale production of CNTs. A catalyst is usually needed for the synthesis of CNTs, the most commonly used catalysts are either organo-metallic compounds such as cobaltocene, ferocene, nicklocene, or metal catalyst powder or thin films [9][10][11][12][13]. Different substrates (such as quartz, silicon wafers, alumina, aluminosilicates etc.)…”

Section: Introductionmentioning

confidence: 99%

Morphology study of carbon nanospecies grown on carbon fibers by thermal CVD technique

Sharma

Lakkad

2009

Surface and Coatings Technology

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Change of tube diameter distribution of single-wall carbon nanotubes induced by changing the bimetallic ratio of Ni and Y catalysts

Cited by 69 publications

References 22 publications

Synthesis of single‐walled carbon nanotubes with the laser vaporization method: Ex situ and in situ measurements

Synthesis of single‐walled carbon nanotubes with the laser vaporization method: Ex situ and in situ measurements

Perspectives of Single-Wall Carbon Nanotube Production in the Arc Discharge Process

Morphology study of carbon nanospecies grown on carbon fibers by thermal CVD technique

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