TEM and XRD Analysis of Carbon Nanotubes Synthesised from Flame

Tan, Win Hon; Lee, Siew Ling; Chong, Cheng Tung

doi:10.4028/www.scientific.net/kem.723.470

Cited by 16 publications

(11 citation statements)

References 28 publications

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“…However, in our study, there seems to be more associated with the formation of CNTs, where the sharp diffraction peak shows the high activity of the catalysts for achieving the carbon products, which confirms the higher yield of the carbon nanofilaments grown over these catalysts. The interlayer distance ( d 002 ) or d-spacing value derived from the XRD data can be used to the structural degree of synthesized CNTs as well, which was calculated by applying the Bragg’s equation ( ) 65 , 66 and the results are presented in Table 6 . It was found that the used catalysts have produced the CNTs with the interplanar spacing value in the range between 0.344 and 0.348 nm, which is very nearly the value obtained from commercial CNTs (0.343 nm).…”

Section: Resultsmentioning

confidence: 99%

Development of high-performance nickel-based catalysts for production of hydrogen and carbon nanotubes from biogas

Saconsint

Sae-tang

Srifa

et al. 2022

Sci Rep

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Selecting a suitable catalyst for implementing the simultaneous production of hydrogen-rich syngas and multi-walled carbon nanotubes through the integration of dry reforming and methane decomposition reactions has recently gained great interests. In this study, a series of bimetallic (NiMo/MgO) and trimetallic (CoNiMo/MgO, FeNiMo/MgO, CoFeMo/MgO) catalysts was prepared and evaluated for a catalytic activity of CH4 and CO2 conversions of biogas in a fixed bed reactor at 800 °C and atmospheric pressure. Among the investigated catalysts, the bimetallic NiMo/MgO catalyst showed the outstanding catalytic performance with 86.4% CH4 conversion and 95.6% CO2 conversion as well as producing the highest syngas purity of 90.0% with H2/CO ratio = 1.1. Moreover, the characterization of the synthesized solid products proved that the well-aligned structured morphology, high purity, and excellent textural properties of CNTs were obtained by using NiMo/MgO catalyst. On the other hand, using trimetallic catalysts which have the composition of Co and Fe leads to the severe deactivation. This could be attributed the catalyst oxidation with CO2 in biogas, resulting in the transformation of metals into large metal oxides. The integrative process with NiMo/MgO catalyst is regarded as a promising pathway, which has a high potential for directly converting biogas into the high value-added products and providing a green approach for managing the enormous amounts of wastes.

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Section: Resultsmentioning

confidence: 99%

Development of high-performance nickel-based catalysts for production of hydrogen and carbon nanotubes from biogas

Saconsint

Sae-tang

Srifa

et al. 2022

Sci Rep

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“…In addition to the known peaks in the X-ray diffraction of CNTs, several others are also observed. These peaks are due to the catalyst (nickel) used in the fabrication process which was observed in NiO form [41].…”

Section: A Characterizationmentioning

confidence: 99%

Effect of Humidity on Gas Sensing Performance of Carbon Nanotube Gas Sensors Operated at Room Temperature

2021

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Carbon nanotubes (CNTs) have shown promising results for gas sensing due to their high surface area. Since humidity has a great impact on the electrical conductivity of resistive CNT gas sensors, we have investigated the change of humidity on their sensing properties. In this study, we fabricated vertically aligned CNT-based gas sensors for the detection of volatile organic compounds. The morphologies and phase structures of the fabricated samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR), confirming the presence of CNT with some surface impurities. It was found that a relative humidity increase from 10% to 80% can reduce the electrical conductivity of the sensor by around 4%. On the other hand, for a humidity above 80% the conductivity increased slightly. The fabricated device has been used as a gas sensor for volatile organic compounds, and the cross-sensitivity to humidity was investigated. It was found that in the fabricated sensors, a change in humidity up to 80% results in a 40% decrease in the response for the studied organic compounds.

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“…The peak around 25° was attributed to the lattice planes of (002), and the intensity and width of (002) peak corresponded to the proportion and the size of the crystalline carbon, respectively. The peak of (10*) around 42° was the superposition of the (100) and (110) peaks due to the in-plane reflection of crystalline carbon [ 44 ]. The evaluated structural parameters are listed in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

The Fabrication and Properties of a Bendable High-Temperature Resistance Conductive Pitch-Based Carbon/CNT Film Nanocomposite

Che

Wang

et al. 2021

Nanomaterials

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This paper fabricates a carbon nanotube (CNT ) film-reinforced mesophase pitch-based carbon (CNTF/MPC) nanocomposite by using a hot-pressing carbonization method. During the carbonization, the stacked aromatic layers tended to rearrange into amorphous carbon, and subsequently generated crystalline carbon in the matrix. The continuous entangled CNT networks were efficiently densified by the carbon matrix though optimized external pressure to obtain the high-performance nanocomposites. The CNTF/MPC@1300 displayed a stable electrical conductivity up to 841 S/cm at RT-150 °C. Its thermal conductivity in the thickness direction was 1.89 W/m∙K, an order of magnitude higher than that of CNT film. Moreover, CNTF/MPC@1300 showed a mass retention of 99.3% at 1000 °C. Its tensile strength was 2.6 times the CNT film and the tensile modulus was two orders of magnitude higher. Though the CNTF/MPC nanocomposites exhibited brittle tensile failure mode, they resisted cyclic bending without damage. The results demonstrate that the CNTF/MPC nanocomposite has potential application in multi-functional temperature resistance aerospace structures.

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TEM and XRD Analysis of Carbon Nanotubes Synthesised from Flame

Cited by 16 publications

References 28 publications

Development of high-performance nickel-based catalysts for production of hydrogen and carbon nanotubes from biogas

Development of high-performance nickel-based catalysts for production of hydrogen and carbon nanotubes from biogas

Effect of Humidity on Gas Sensing Performance of Carbon Nanotube Gas Sensors Operated at Room Temperature

The Fabrication and Properties of a Bendable High-Temperature Resistance Conductive Pitch-Based Carbon/CNT Film Nanocomposite

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