2018
DOI: 10.18321/ectj765
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Raman Characteristics of Multiwall Carbon Nanotubes on Diatomite

Abstract: In this paper, the diatomite mineral from Mugalzhar field, Aktobe region, has been used as a matrix of catalyst particles to synthesize multiwall carbon nanotubes (MWCNTs) by Catalytic Chemical Vapor Deposition method (CCVD). As a source of carbon was used a propane-butane gas mixture, as a catalyst – Ni particles deposited from Ni(NO3)2 solution during heat treatment process at 400–500 °C. The CCVD method was conducted at a different temperature: 650 °C, 700 °C, 750 °C, 800 °C. Obtained MWCNTs were studied b… Show more

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Cited by 5 publications
(5 citation statements)
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“…As it can be seen from the spectra, the D peak is around 1340 cm −1 , the G peak is at 1570 cm −1 and the 2D peak is at about 2700 cm −1 . The D peak is due to the defects, the G peak resembles the graphitic nature of the sample, whereas the 2D peak arises due to the two phonon second order scattering process [ 38 ]. The results show that the peaks’ positions are not altered as the temperature increases and that the intensity of the G band increases as the temperature rises to 140 °C; accordingly, the I D /I G ratio decreases from 1.29 at room temperature to 1.14.…”
Section: Characterization Resultsmentioning
confidence: 99%
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“…As it can be seen from the spectra, the D peak is around 1340 cm −1 , the G peak is at 1570 cm −1 and the 2D peak is at about 2700 cm −1 . The D peak is due to the defects, the G peak resembles the graphitic nature of the sample, whereas the 2D peak arises due to the two phonon second order scattering process [ 38 ]. The results show that the peaks’ positions are not altered as the temperature increases and that the intensity of the G band increases as the temperature rises to 140 °C; accordingly, the I D /I G ratio decreases from 1.29 at room temperature to 1.14.…”
Section: Characterization Resultsmentioning
confidence: 99%
“…The results show that the peaks’ positions are not altered as the temperature increases and that the intensity of the G band increases as the temperature rises to 140 °C; accordingly, the I D /I G ratio decreases from 1.29 at room temperature to 1.14. This could be termed as a “low defect” density region [ 38 ], wherein the I D /I G ratio decreases with the increase in defect intensity, as increase in G peak is more appreciable than D peak. The ratio remains rather steady up to 240 °C, when it starts to increase reaching a value of 1.26.…”
Section: Characterization Resultsmentioning
confidence: 99%
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“…The G band is due to the sp2 graphitic nature of the sample, and the intensity is proportional to the crystallinity [17]. The Raman spectra of the diatom doped with the FeCo (Figure 4d) show a peak at 2671 cm −1 that corresponds to the 2D band that is associated with the long-range order in a sample mainly along the crystallographic c-axis [2]. The 2D band in these spectra suggests the formation of MWCNTs on the diatom surface, as shown in Figure 3h and Table 1.…”
Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning
confidence: 99%
“…Diatoms are silicon dioxide minerals with a high specific surface area and porosity [1]. They are also a low-cost bioresource, available on a large scale, and contain other sediments, such as clay, inorganic carbonates, iron oxides, and sand [2]. In aqueous solutions, diatoms have negative charges, so they exhibit a strong, attractive force to particles with a positive charge making these materials suitable as a support for the synthesis of carbon-based nanomaterials.…”
Section: Introductionmentioning
confidence: 99%