Mass production of high-quality multi-walled carbon nanotube bundles on a Ni/Mo/MgO catalyst

Li, Y.; Zhang, X. B.; Tao, Xinyong; Xu, Ji; Huang, Wensheng; Luo, Junhang; Luo, Zhiqiang; Li, T.; Liu, F.; Yu, Bo; Geise, H. J.

doi:10.1016/j.carbon.2004.09.014

Cited by 166 publications

(66 citation statements)

References 26 publications

(34 reference statements)

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“…19,20 For our samples, these temperatures were within a range of 660°C-677°C, which corresponds to carbonaceous products with multilayers (eg, multi-walled carbon nanotubes). 21 It is important to mention that all curves exhibit a single mass-loss profile, as is characteristic of materials containing only one type of carbonaceous product. No mass loss was observed within the temperature range of 200°C-400°C, so the presence of amorphous carbon was not detected in our samples.…”

Section: Resultsmentioning

confidence: 99%

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Biriş

Pruneanu²,

Pogăcean³

et al. 2013

IJN

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This work describes the synthesis of few-layer graphene sheets embedded with various amounts of gold nanoparticles (Gr-Au-x) over an Au x /MgO catalytic system (where x = 1, 2, or 3 wt%). The sheet-like morphology of the Gr-Au-x nanostructures was confirmed by transmission electron microscopy and high resolution transmission electron microscopy, which also demonstrated that the number of layers within the sheets varied from two to seven. The sample with the highest percentage of gold nanoparticles embedded within the graphitic layers (Gr-Au-3) showed the highest degree of crystallinity. This distinct feature, along with the large number of edge-planes seen in high resolution transmission electron microscopic images, has a crucial effect on the electrocatalytic properties of this material. The reaction yields (40%-50%) and the final purity (96%-98%) of the Gr-Au-x composites were obtained by thermogravimetric analysis. The Gr-Au-x composites were used to modify platinum substrates and subsequently to detect adenine, one of the DNA bases. For the bare electrode, no oxidation signal was recorded. In contrast, all of the modified electrodes showed a strong electrocatalytic effect, and a clear peak for adenine oxidation was recorded at approximately +1.05 V. The highest increase in the electrochemical signal was obtained using a platinum/Gr-Au-3-modified electrode. In addition, this modified electrode had an exchange current density (I 0 , obtained from the Tafel plot) one order of magnitude higher than that of the bare platinum electrode, which also confirmed that the transfer of electrons took place more readily at the Gr-Au-3-modified electrode.

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Section: Resultsmentioning

confidence: 99%

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Biriş

Pruneanu²,

Pogăcean³

et al. 2013

IJN

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“…[7] It is also noted that the growth temperature is as low as 550°C, lower than in conventional CVD. [8,13,19] According to the report of Dupuis, [9] an added component can lower the activation energy for dissociation and the growth temperature by changing the electronic structure of the catalyst. In our case, it is proposed that the alkali-element doping changes the electronic structure of the copper catalyst.…”

Section: Resultsmentioning

confidence: 97%

“…[5,6] Though various methods have been well developed for the synthesis of CNTs, CVD [7,8] can offer a promising way to low-cost, large-scale, and various-form syntheses for commercial requirements. CVD of a hydrocarbon over metal catalysts such as Fe, Co, Ni, and their alloys has been a classic method to produce carbon nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Morphology‐Controllable CVD Synthesis of Carbon Nanomaterials on an Alkali‐Element‐Doped Cu Catalyst

Tao

Zhang

Cheng

et al. 2006

Chemical Vapor Deposition

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Several categories of carbon nanomaterials have been synthesized using an alkali element-doped Cu catalyst by a simple CVD method. By controlling the reaction temperature, various products such as multibranched carbon nanotubes, carbon nanotubes filled with Cu nanocones at the tips (Cu-CNTs), and Cu-CNTs with carbon nanofiber tails can be obtained. Fieldemission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and high-resolution (HR)TEM have been employed to characterize the products. It is proposed that the alkali-element doping changes the electronic structure of the copper catalyst. The activity of the alkali-element-doped Cu catalyst shows dependence on the temperature.

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“…The carbon yield is calculated as follows: yield [%] = 100 (m tot -m cat )/m cat, where m cat is the initial amount of catalyst and m tot the total mass of the sample after reaction. According to previous work [17][18] and transmission electron microscopy (TEM) observations, over 90 % of the produced carbon should be MWNTs.…”

Section: Ratios Of Ch 4 /H 2 and Ch 4 /N 2 On P-ni/mo/mgo And Their Ementioning

confidence: 97%

“…[17] When this type of MgMoO 4 single phase is doped with a little nickel, the so-formed Ni/Mo/MgO catalyst has a higher efficiency for synthesizing MWNT bundles than the MgMoO 4 and Mg 1-x Fe x MoO 4 catalysts. [18][19] In the present work, we further investigate the behavior of the nickeldoped Ni/Mo/MgO catalyst and present a mechanism of the formation of MWNT bundles on the catalyst, based on a study by X-ray powder diffraction of the phase transformation of the Ni/Mo/MgO catalyst during the synthesis of MWNTs.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Ni‐Doped MgMoO₄ Single‐Phase Catalysts for Synthesis of Multiwalled Carbon Nanotube Bundles

Zhang

Geise

et al. 2007

Chemical Vapor Deposition

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A significant effect is found when various ratios of CH 4 /H 2 and CH 4 /N 2 are used for the synthesis of multiwalled carbon nanotube (MWNT) bundles on nickel-doped MgMoO 4 (Ni/Mo/MgO) as a catalyst. The absorption of hydrogen makes the nickel-molybdenum nanoparticles highly dispersed on the porous MgO, and the synergism of nickel-molybdenum has the effect that sufficient carbon atoms are rapidly dissolved in the molten nickel-molybdenum nanoparticles, leading to a high yield of MWNTs. The phase transformations of the catalysts and the formation mechanism of the MWNT bundles on Ni/Mo/ MgO catalyst are also presented.

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Mass production of high-quality multi-walled carbon nanotube bundles on a Ni/Mo/MgO catalyst

Cited by 166 publications

References 26 publications

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Morphology‐Controllable CVD Synthesis of Carbon Nanomaterials on an Alkali‐Element‐Doped Cu Catalyst

Behavior of Ni‐Doped MgMoO₄ Single‐Phase Catalysts for Synthesis of Multiwalled Carbon Nanotube Bundles

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Mass production of high-quality multi-walled carbon nanotube bundles on a Ni/Mo/MgO catalyst

Cited by 166 publications

References 26 publications

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Few-layer graphene sheets with embedded gold nanoparticles for electrochemical analysis of adenine

Morphology‐Controllable CVD Synthesis of Carbon Nanomaterials on an Alkali‐Element‐Doped Cu Catalyst

Behavior of Ni‐Doped MgMoO4 Single‐Phase Catalysts for Synthesis of Multiwalled Carbon Nanotube Bundles

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Behavior of Ni‐Doped MgMoO₄ Single‐Phase Catalysts for Synthesis of Multiwalled Carbon Nanotube Bundles