Super growth of vertically aligned SWCNTs using self-assembled nanoparticles from CoCrPtOx ultra-thin film

Wang, W.H.; Hong, T.H.; Kuo, Tai-Jung

doi:10.1016/j.carbon.2006.07.020

Cited by 14 publications

(4 citation statements)

References 18 publications

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“…The ratio of the G band to the D band intensities (G/D ratio) is about 7.8 at 0.2%. This value is not as high as that for SWNTs synthesized in our previous study [15], but almost the same as those for aligned SWNTs reported by some other research groups [9][10][11][12][13][14]. Considering the TEM observation along with this Raman spectrum, we concluded that vertically aligned SWNTs with good purity and moderate quality were synthesized for 0.2% at a low temperature of 590 • C. On the other hand, the G/D ratio is not high at a source gas ratio of 18.2%, which appears similar to that of typical CVD-grown MWNTs.…”

Section: Resultssupporting

confidence: 89%

“…They also demonstrated selective growth of DWNTs or SWNTs by controlling the catalyst thickness. In the case of SWNTs, there are many more reports regarding vertically aligned growth [9][10][11][12][13][14]. Murakami et al [9] first reported on the growth of vertically aligned SWNTs on a substrate at a growth temperature of 800 • C using alcohol as a carbon source.…”

Section: Introductionmentioning

confidence: 99%

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Selective growth of vertically aligned double- and single-walled carbon nanotubes on a substrate at 590 °C

et al. 2008

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Vertically aligned double- and single-walled carbon nanotubes (DWNTs and SWNTs) were synthesized on a substrate at 590 °C by hot-filament chemical vapor deposition. An optimized combination of iron and aluminum layers as the catalyst resulted in iron particles ranging from 1-5 nm floating in an aluminum matrix after annealing. Selective synthesis of DWNTs and SWNTs from such particles was achieved by adjusting the dilution ratio of acetylene that was used as the source gas. The yield of DWNTs among all CNTs was as high as 81%, while that of SWNTs was almost 100%. The diameter distribution of DWNTs was narrow, with a standard deviation of about 12%.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Selective growth of vertically aligned double- and single-walled carbon nanotubes on a substrate at 590 °C

et al. 2008

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“…Therefore, there has been considerable progress in recent research regarding the synthesis of long CNTs. [10][11][12][13][14][15][16][17][18] Millimeter-scale t-MWCNTs have been synthesized using conventional thermal chemical vapor deposition (CVD) [19][20][21][22][23][24] and plasma-enhanced CVD 25,26) via the introduction of several gases such as oxygen, 25) water, 19) alcohol, 23) and camphor 24) as auxiliary gases. These results demonstrated that oxygen may play a special role in the growth of CNTs.…”

Section: Introductionmentioning

confidence: 99%

Growth of Millimeter-Scale Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition

Kim

Song

Lee

et al. 2010

Jpn. J. Appl. Phys.

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Millimeter-scale, vertically aligned carbon nanotubes (CNTs) were grown at a relatively low temperature of 700 °C by the microwave plasma chemical vapor deposition. Oxygen and water were used to investigate their role in the growth rate and crystallinity of CNTs. Scanning electron microscopy and transmission electron microscopy were adopted to observe the height and number of walls of the CNTs, respectively. The addition of oxygen significantly increased the growth rate of CNTs (∼23 µm/min) for 70 min, which is three and two times higher than that of normal CNTs and water-assisted CNTs, respectively. Furthermore, the high growth rate was maintained for 220 min and the crystallinity of CNTs, which was evaluated by the G to D band ratio in Raman spectra, was also greatly improved only by introducing oxygen.

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“…Thermal annealing often results in a large shape and diameter distribution of the catalyst particles [12][13][14], with shapes ranging from circular to elongated. It is known that a subsequent plasma treatment of a thermally annealed catalyst film decreases the dimensions of the particles and increases the particle density, resulting in an improved shape and diameter uniformity [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of the catalyst evolution during annealing preceding the growth of carbon nanotubes by microwave plasma-enhanced chemical vapour deposition

et al. 2007

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A two-step catalyst annealing process is developed in order to control the diameter of nickel catalyst particles for the growth of carbon nanotubes (CNTs) by microwave plasma-enhanced chemical vapour deposition (MW PECVD). Thermal annealing of a continuous nickel film in a hydrogen (H 2 ) environment in a first step is found to be insufficient for the formation of nanometre-size, high-density catalyst particles. In a second step, a H 2 MW plasma treatment decreases the catalyst diameter by a factor of two and increases the particle density by a factor of five. An x-ray photoelectron spectroscopy study of the catalyst after each step in the annealing process is presented. It is found that the catalyst particles interact with the substrate during thermal annealing, thereby forming a silicate, even if a buffer layer in between the catalyst and the substrate is intended to prevent silicate formation. The silicate formation and reduction is shown to be directly related to the CNT growth mechanism, determining whether the catalyst particles reside at the base or the tip of the growing CNTs. The catalyst particles are used for the growth of a high-density CNT coating by MW PECVD. CNTs are analysed with electron microscopy and Raman spectroscopy.

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Super growth of vertically aligned SWCNTs using self-assembled nanoparticles from CoCrPtOx ultra-thin film

Cited by 14 publications

References 18 publications

Selective growth of vertically aligned double- and single-walled carbon nanotubes on a substrate at 590 °C

Selective growth of vertically aligned double- and single-walled carbon nanotubes on a substrate at 590 °C

Growth of Millimeter-Scale Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition

Study of the catalyst evolution during annealing preceding the growth of carbon nanotubes by microwave plasma-enhanced chemical vapour deposition

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