Study of Microwave Torch Plasmachemical Synthesis of Iron Oxide Nanoparticles Focused on the Analysis of Phase Composition

Synek, Petr; Jašek, Ondřej; Zajı́čková, Lenka

doi:10.1007/s11090-014-9520-x

Cited by 19 publications

(19 citation statements)

References 55 publications

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“…Maghemite (γ-Fe 2 O 3 ) phase was detected (Figure S1 Supplementary Materials) by selected area electron diffraction (SAED) by TEM. It is in agreement with the data obtained by Synek et al [34].…”

Section: Characterization Of Catalytic Nanoparticles and Carbonsupporting

confidence: 94%

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Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

et al. 2018

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The ammonia adsorption on the nanostructured carbon thin film was significantly influenced by the choice of deposition temperature and deposition time of thin film synthesis. The thin films were prepared on Si/SiO2 substrates by chemical vapour deposition in Ar/C2H2 gas mixture using iron catalytic nanoparticles. The analysis of the grown layer by the scanning and transmission electron microscopy showed the transition from long multiwalled nanotubes (MWCNTs) to bamboo-like hollow carbon nanofiber structure with the decrease of the deposition temperature from 700 to 600°C. Further, the material was analyzed by energy-dispersive X-ray spectroscopy and Raman spectroscopy confirmed the transition from graphitic sp2 structure to highly defective structure at lower deposition temperature. The resistance of the prepared layer strongly depends on deposition temperature (Td) and deposition time (td). High resistance layer, 38.6 kΩ, was formed at Td 600°C and td 10 min, while at Td 700°C and td 60 min, the resistance decreased to 860 ohms. Such behaviour is consistent with MWCNTs being responsible for the formation of the conductive network. Such system was studied using chemiresistor ammonia gas sensor configuration. The sensor resistance increased when exposed to ammonia in all the cases, but their response varied considerably. A decrease in deposition time, from 60 to 10 min, and the deposition temperature, from 700 to 600°C, led to the 10-fold increase in the sensor response. The measurements carried out at room temperature showed the higher sensor response than the measurements carried out at 200°C. This behaviour can be explained by the change in adsorption-desorption equilibrium at different temperatures. Analysis of dependence of the sensor response on the ammonia concentration proved that the underlying resistance change mechanism is chemisorption of ammonia molecules on the carbon network corresponding to the Langmuir isotherm.

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Section: Characterization Of Catalytic Nanoparticles and Carbonsupporting

confidence: 94%

“…Nanoparticles (NPs) of iron catalyst were deposited by a microwave (MW) plasma torch from the iron pentacarbonyl, Fe(CO) 5 , vapours mixed with argon. The experimental set-up is described by Synek et al [34,35] in detail. The c-Si/SiO 2 substrates were put in a special holder for 4 samples.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

et al. 2018

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“…This is because wet chemical processes involve low temperatures. In contrast to wet chemical processes, thermal plasma-based ones involve evaporation of the constituent metals at temperatures higher than 10,000 K, followed by rapid condensation of the gas phases [6][7][8][9][10]. Thermal plasma-based processes have other advantages over wet chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Copper Oxide of Plasma-Chemical Synthesis for Doping Superconducting Materials

et al. 2017

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“…This is because wet chemical processes involve low temperatures. In contrast to wet chemical processes, thermal plasma-based ones involve the evaporation of the constituent metals at temperatures higher than 10,000 K, followed by the rapid condensation of the gas phases [9][10][11][12][13]. Thermal plasma-based processes have other advantages over wet chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

Uschakov

Карпов

Лепешев

et al. 2016

Vacuum

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Abstract. The influence of a pressure of gas mixture (10 vol% O 2 + 90% N 2 ) on an average size of copper oxide nanoparticles, produced in the plasma of low pressure arc discharge, has been studied as a basic process variable. A correlation between the dependence of average particle size on gas mixture pressure and the dependence of discharge gap voltage on product of interelectrode distance by a gas mixture pressure, has been found. The estimation was carried out by means of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). A mathematical model of the cathode region, which shows the applicability of the similarity theory to the low pressure arc discharge, has been represented.

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Study of Microwave Torch Plasmachemical Synthesis of Iron Oxide Nanoparticles Focused on the Analysis of Phase Composition

Cited by 19 publications

References 55 publications

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

Enhanced Ammonia Adsorption on Directly Deposited Nanofibrous Carbon Films

Copper Oxide of Plasma-Chemical Synthesis for Doping Superconducting Materials

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

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