Synthesis of MWCNTs from xylenes for fabrication of highly electrically conductive and gas-sensitive polymer composites

Huseynov, Asgar; Mammadova, Samira; Zeynalov, Eldar; Israfilov, Aydin; Abdullayeva, S. H.

doi:10.1080/1536383x.2022.2084609

Cited by 5 publications

(6 citation statements)

References 47 publications

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Section: Resultsmentioning

confidence: 99%

“…However, at the same time, for comparison and analysis of the results, three other nanocomposites that had been prepared using the same irreversible dispersion method and investigated in the same conditions before by our research group were added to the table. 24 The results of these measurements are summarized in Table 3. * -Changes in electrical resistance values of the nanocomposites under gases 24 As can be seen from Table 3, no gas sensory effect was observed for the PVAl/x MWCNTs (x = 4%) sample.…”

Section: Gas Sensing Of Compositesmentioning

confidence: 99%

“…24 The results of these measurements are summarized in Table 3. * -Changes in electrical resistance values of the nanocomposites under gases 24 As can be seen from Table 3, no gas sensory effect was observed for the PVAl/x MWCNTs (x = 4%) sample. However, the highest gas sensory effect was observed for PVAc/x MWCNTs (x = 4%) nanocomposite under CO gas (from 1.371*10 6 to 9.92*10 6 ).…”

Section: Gas Sensing Of Compositesmentioning

confidence: 99%

“…In the literature, there are a number of works devoted to the production and study of sensitive elements for gas sensors based on different carbon nanomaterials, mostly modified nanomaterials, and various polymer matrices for determining these gases. [20][21][22][23][24] Moreover, there are still challenges in the field of gas sensors (sensitivity, selectivity, etc.) that should be solved.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of MW-CNT/polymer composites matrix type on the electrical and gas-sensitive properties

Huseynov¹,

Israfilov²,

Mammadova

et al. 2023

Journal of Composite Materials

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In this paper, polyurethane/MW-CNT, silicone/MW-CNT, and epoxy/MW-CNT nanocomposites were prepared, and their electrical and gas-sensitive properties were investigated. The aerosol-assisted chemical vapor deposition method was used to synthesize MW-CNTs from acetonitrile as a carbon source. These nanocomposites were prepared by an irreversible dispersion method that was developed by our group. SEM analysis results proved that smooth-surfaced, less defective MW-CNTs with 30–60 nm diameter and 60-50 μm length were synthesized successfully. The electrical conductivity of the prepared nanocomposites reveals the correspondence between the degree of uniformity of distribution of MW-CNTs inside polymers and the electrical conductivity of nanocomposites. The electrical conductivity graphs for Epoxy/x MW-CNTs and PU/x MW-CNTs nanocomposites have the same shape, and there is a sharp increase in electrical conductivity from 4% of MW-CNTs, but the values are different: Epoxy/x MW-CNTs (x = 8%) (1000 S/m) and PU/x MW-CNTs (x = 8%) (24.39 S/m). The electrical conductivity graph of silicone/x MW-CNT has a different shape, and percolation began at 2% of MW-CNT and increased sharply till 4%, then there was observed saturation. These results proved that the nanocomposite’s electrical conductivity properties depend on the polymer matrix nature. Simultaneously, the gas-sensitive properties of these nanocomposites were discovered. Thus, it was determined that the highest resistance change was observed for PVAc/x MW-CNT (x = 4%) nanocomposite under CO gas. Except for PVAl/x-MW-CNT (x = 4%), other nanocomposites show a gas-sensitive effect depending on gas types. Moreover, the resistance of all nanocomposites decreases with increasing temperature (from 20 to 120°C) and their behavior as semiconductors. However, the shapes of the graphs of the resistance depending on temperature are different depending on the nanocomposites, and their values are also different, some of them in the Om, KOm, and MOm ranges.

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Section: Resultsmentioning

confidence: 99%

Section: Gas Sensing Of Compositesmentioning

confidence: 99%