Effect of oxidative treatment on the electrochemical properties of aligned multi-walled carbon nanotubes

Fedorovskaya, Ekaterina O.; Bulusheva, L. G.; Kurenya, A. N.; Asanov, I. P.; Окотруб, А. В.

doi:10.1134/s1023193516050049

Cited by 19 publications

(11 citation statements)

References 32 publications

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“…Figure 4 presents the XPS spectra of carbon, oxygen, and iron in the samples before and after hydrogen plasma treatment. The deconvolution of C 1s spectra ( Figure 4 a) indicates the presence of graphite-like sp 2 carbon (component at 284.5 eV), disordered regions in the hexagonal carbon network (C dis component at 285.1 eV) [ 48 ], carbon in oxygen-containing groups C–O, C=O (286.6 eV), and COOH (288.5 eV), and π plasmon at 290.5 eV [ 49 , 50 , 51 , 52 ]. The plasma-treated sample shows the higher intensity of the peaks from C dis and the oxygen-containing groups, indicative of a larger number of defect states on the CNT surface [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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“…S1) and this oxygen forms different functional groups (Fig. 1), particularly, hydroxyls and carboxyls [43]. The C 1s spec trum of this sample has an enhanced intensity of the component at 285.3 eV, which could confirm the creation of defects (holes) in the DWCNTs walls as result of the boiling in concentrated H 2 SO 4 .…”

Section: Materials Structure and Compositionmentioning

confidence: 67%

Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Bulusheva

Sysoev

Lobiak

et al. 2019

Carbon

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a b s t r a c tA chemical procedure for modification of double walled carbon nanotubes (DWCNTs) to enhance their response to humidity was developed. The DWCNTs walls were etched by hot concentrated sulfuric acid, after what the edge carbon sites were saturated by chlorine via reaction with CCl 4 vapor. This treatment increases the dispersibility of DWCNTs in solvents, removes oxygen groups, and produces chlorine decorated holes in the outer walls. Networks of chlorinated holey DWCNTs showed a high repeatable response to humid environment and a good reversible behavior after the sensor purging by dry air. The density functional theory calculations predict enhanced polarization of the DWCNTs when they contain chlorine decorated holes in the outer walls and physisorption of H 2 O molecules near chlorine atoms. These two effects are the cause of an intense low noise signal to gaseous H 2 O and easy sensor recovery.

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“…The amount of hydroxyl and carbonyl groups is reduced as compared to the initial material. A large contribution in RGO‐COOH spectrum is made by the peak E, corresponding to carboxyl groups, which indicates the selective addition of carboxyl groups to the surface of the material during the synthesis . In addition, it was calculated from the XPS data that in the initial RGO contained about 3% of COOH group of all carbon atoms.…”

Section: Resultsmentioning

confidence: 99%

Redox Processes in Reduced Graphite Oxide Decorated by Carboxyl Functional Groups

Kobets

Iurchenkova

Asanov

et al. 2019

Physica Status Solidi (b)

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The reduction of graphite oxide makes it possible to obtain a graphene material with a developed surface, high conductivity and remarkable electrochemical behavior. The study of the electrochemical activity of oxygen‐containing functional groups on the graphene surface is important for the creation of electrochemical energy sources and sensors. In this work, the reduced graphite oxide is selectively decorated by carboxyl functional groups. The initial and carboxylated reduced graphite oxide are studied by SEM microscopy, FTIR, Raman, and X‐ray photoelectron spectroscopy. It is shown that a large number of carboxyl groups added to reduced graphite oxide surface change the sample morphology. Studying of reduced graphite oxide and carboxylated reduced graphite oxide by cyclic voltammetry shows reversible redox processes, which is associated with oxidation and reduction of the hydroxyl, carbonyl, and carboxyl groups. In addition, the dependence of peak potentials on the pH value is studied.

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Effect of oxidative treatment on the electrochemical properties of aligned multi-walled carbon nanotubes

Cited by 19 publications

References 32 publications

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Redox Processes in Reduced Graphite Oxide Decorated by Carboxyl Functional Groups

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