Synthesis of diameter-controlled carbon nanotubes using centrifugally classified nanoparticle catalysts

Inoue, Takashi; Gunjishima, Itaru; Okamoto, Atsuto

doi:10.1016/j.carbon.2007.06.056

Cited by 34 publications

(25 citation statements)

References 31 publications

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“…This phenomenon of CNT diameter dependence on catalyst size thus provides key parameter to achieve diameter controlled synthesis of carbon nanotubes by controlling the diameter of the catalyst particles. However, the ratio of CNT diameter to the catalyst particle size also depends on growth temperature [28]. In some cases the diameter of catalyst particles may differ from the diameter of the grown carbon filaments/nanotubes depending on growth temperature.…”

Section: Morphology Of Nanospeciesmentioning

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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Section: Morphology Of Nanospeciesmentioning

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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“…The catalytic chemical vapor deposition (CCVD) method is favored for chiral-selective growth since it is more controllable than arc-discharge or laser-ablation. The CCVD parameters that have been adjusted and examined for controlling SWNT growth include the catalyst preparation and support, type of carbon feedstock, gas pressure and reaction temperature [3][4][5][6][7][8][9][10][11][12]. Although chiral selective growth has not been achieved, it is clear that changing these growth parameters affects reaction kinetics and(or) leads to preferential growth of a subset of SWNT chiralities [11].…”

Section: Introductionmentioning

confidence: 99%

“…The linear correlation between the SWNT diameter and the size of the catalyst metal particle from which it grows has long been identified [13], with the ratio of the catalyst:SWNT diameters ranging from 1.1 to 1.6 [5,6,14]. Although there are several computational studies on cap nucleation [15][16][17][18][19][20], it is still debatable as to whether the catalyst particle determines the SWNT diameter at the nucleation stage (by providing a template for cap formation), or whether the SWNT changes diameter after nucleation to fit to the particle diameter.…”

Section: Introductionmentioning

confidence: 99%

DFT and tight binding Monte Carlo calculations related to single-walled carbon nanotube nucleation and growth

Zhu

Börjesson

Bolton

2010

Carbon

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Density functional theory (DFT) calculations of the nucleation of (5, 5) and (10, 0) single-walled carbon nanotubes (SWNTs) on a 55 atom nickel cluster (Ni 55 ) showed that it requires a larger chemical potential to grow a carbon island (which is the precursor to the SWNTs) on the cluster than to extend the island into a SWNT or to have the carbon atoms dispersed on the cluster surface. Hence, in the thermodynamic limit the island will only form once the (surface of the) cluster is saturated with carbon, and the island will spontaneously form a SWNT at the chemical potentials required to create the island. The DFT (zero Kelvin) and tight binding Monte Carlo (1000 K) also show that there is a minimum cluster size required to support SWNT growth, and that this cluster size can be used to control the diameter, but probably not the chirality, of the SWNT at temperatures relevant to carbon nanotube growth. It also imposes a minimum size of clusters that are used in SWNT regrowth.

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“…Hydrogen sulfide (H2S) gases were applied to our process for growing VA thin-MWCNTs. Although VA thin-MWCNT arrays have been grown by various CVD techniques, their field emission performances have not been reported yet [24][25][26][27].…”

Section: ⅰ Introductionmentioning

confidence: 99%

Synthesis of vertically aligned thin multi-walled carbon nanotubes on silicon substrates using catalytic chemical vapor deposition and their field emission properties

Jung¹,

Choi²,

Lee

2008

Journal of the Korean Vacuum Society

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We have succeeded in synthesizing vertically aligned thin multi-walled carbon nanotubes (VA thin-MWCNTs) by a catalytic chemical vapor deposition (CCVD) method onto Fe/Al thin film deposited on a Si wafers using an optimum amount of hydrogen sulfide (H 2 S) additive. Scanning electron microscope (SEM) images revealed that the as-synthesized CNT arrays were vertically well-oriented perpendicular to the substrate with relatively uniform length. Transmission electron microscope (TEM) observations indicated that the as-grown CNTs were nearly catalyst-free thin-MWCNTs with small outer diameters of less than 10nm.The average wall number is about 5. We suggested a possible growth mechanism of the VA thin-MWCNT arrays. The VA thin-MWCNTs showed a low turn-on electric field of about 1.1 V/μm at a current density of 0.1 μA/cm 2 and a high emission current density about 2.5 mA/cm 2 at a bias field of 2.7 V/μm. Moreover, the VA thin-MWCNTs presented better field emission stability without degradation over 20 hours (h) at the emission current density of about 1 mA/cm 2 .

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Synthesis of diameter-controlled carbon nanotubes using centrifugally classified nanoparticle catalysts

Cited by 34 publications

References 31 publications

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

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

DFT and tight binding Monte Carlo calculations related to single-walled carbon nanotube nucleation and growth

Synthesis of vertically aligned thin multi-walled carbon nanotubes on silicon substrates using catalytic chemical vapor deposition and their field emission properties

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