Single phase MgMoO4 as catalyst for the synthesis of bundled multi-wall carbon nanotubes by CVD

Li, Y.; Zhang, X.B.; Tao, Xinyong; Xu, Jing; Chen, Fengyang; Shen, Ling; Yang, Xiaoxuan; Liu, Fei; Tendeloo, G. Van; Geise, H. J.

doi:10.1016/j.carbon.2004.12.022

Cited by 26 publications

(9 citation statements)

References 17 publications

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“…The temperature of the degradation of the CNTs is often taken as an indication for their degree of graphitization (surface perfection). 17 From the derivatives of the mass loss curves, it appears that this temperature is not very different for the two SWCNT types studied here. A typical Raman spectrum of a CNT mat or dispersion shows a few characteristic bands.…”

Section: Resultsmentioning

confidence: 71%

Probing the Cooperative Nature of the Conductive Components in Polystyrene/Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate)−Single-Walled Carbon Nanotube Composites

et al. 2010

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The percolation threshold of single-walled carbon nanotubes (SWCNTs) introduced into polystyrene (PS) via a latex-based route has been reduced by using conductive surfactants. The use of the conductive polymeric latex, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), in conjunction with SWCNTs leads to conductive composites with loadings of both constituents below their own individual percolation thresholds. The high concentration of PEDOT:PSS in the final composites raises the concern that the composite conductivity is a result of the presence of the PEDOT:PSS alone. To elucidate the cooperative nature of the two conductive components, the contribution of the SWCNTs to the overall composite conductivity is investigated by replacing the original high-quality SWCNTs with SWCNTs of a lower quality. Percolation thresholds recorded for systems utilizing the lower quality tubes stabilized with nonconductive surfactants were over 2 wt % SWCNTs (4 times that of previously reported systems). The introduction of PEDOT:PSS was, once again, found to lower the percolation threshold (to 0.3 wt %) and to increase the ultimate conductivity up to the level of a pure PEDOT:PSS/PS blend. In the PS/PEDOT:PSS−SWCNT systems, the role of the SWCNT network is proposed to be limited to the formation of a template or scaffold on which a (more or less) continuous PEDOT:PSS layer deposits. The ultimate conductivity is therefore determined by the PEDOT:PSS alone.

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Section: Resultsmentioning

confidence: 71%

Probing the Cooperative Nature of the Conductive Components in Polystyrene/Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate)−Single-Walled Carbon Nanotube Composites

et al. 2010

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“…A second small peak was observed around 470°C, which can be attributed to nanotubes with walls that have more than one layer. However, we cannot say that they are multi-walled nanotubes (MWNT) because they oxidize at temperatures between 600 and 700°C [8,47,50,51]. However, additional characterization techniques are needed to confirm these observations.…”

Section: Characterization Of the Carbonmentioning

confidence: 99%

Catalytic Decomposition of Methane Over M–Co–Al Catalysts (M = Mg, Ni, Zn, Cu)

2011

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The catalytic decomposition of methane over M-Co-Al (M = Mg, Ni, Zn, Cu) was studied. The samples were prepared by co-precipitation and characterized by S BET , TGA, DTA, TPR and XRD. The carbon produced in the reaction was characterized by SEM and TPO. Activity tests were carried out in a thermobalance between 500 and 750°C. The results show that the textural properties of the calcined samples did not change significantly with the partial substitution of Co by Mg, Ni, Zn or Cu. On the other hand, there were marked differences in the reduced samples. There was a strong influence on the reducibility of cobalt oxides in the presence of Ni or Cu. Nickel promoted the reduction of Co 3 O 4 at the same temperature as the NiO phase, whereas copper strongly decreased the reduction temperature of both Co 3 O 4 and CoAl 2 O 4 due to a synergistic effect between Cu and Co. The sample containing Cu resulted in low catalytic activity in the whole temperature range because the reduction conditions promoted the formation of a Cu-Co alloy. In the reaction carried out at 700°C, the observed activity was Co-Al [ Mg-CoAl [ Ni-Co-Al. All the samples were deactivated by encapsulation under these conditions due to high rates of carbon deposition. The carbon produced was mainly carbon nanotubes, except for the Cu-Co-Al sample, which produced mostly amorphous carbon.

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“…Many studies [9][10][11][12][13][14][15][16][17] have found that molybdates and tungstates (such as MMoO 4 (M ¼Ca, Sr, Ba, Mg), Bi 2 MoO 6 , ZnWO 4 , Bi 2 WO 6 , M 2.5 VMoO 8 (M¼Mg, Zn) and La 2 Mo 2 O 9 ) are important materials in photoluminescence and photocatalysis, and these have been successfully synthesized by different methods including hydrothermal processes, electrochemical methods, solid-state reaction methods, micro-emulsification and so on. The properties of the compounds depend greatly on their structural and morphological characters.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, morphology and phase transition of the zinc molybdates ZnMoO4·0.8H2O/α-ZnMoO4/ZnMoO4 by hydrothermal method

Zhang

Yang

et al. 2010

Journal of Crystal Growth

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Single phase MgMoO4 as catalyst for the synthesis of bundled multi-wall carbon nanotubes by CVD

Cited by 26 publications

References 17 publications

Probing the Cooperative Nature of the Conductive Components in Polystyrene/Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate)−Single-Walled Carbon Nanotube Composites

Probing the Cooperative Nature of the Conductive Components in Polystyrene/Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate)−Single-Walled Carbon Nanotube Composites

Catalytic Decomposition of Methane Over M–Co–Al Catalysts (M = Mg, Ni, Zn, Cu)

Synthesis, morphology and phase transition of the zinc molybdates ZnMoO4·0.8H2O/α-ZnMoO4/ZnMoO4 by hydrothermal method

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