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NO₂ Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

ABSTRACT: This article is devoted to the investigation of the sensing behavior of chemically treated multi-walled carbon nanotubes (MWNTs) at room temperature. Chemical treatment of MWNTs was carried out with a solution of either sulfuric or chromic acids. The materials obtained were investigated by transmission electron microscopy, scanning electron microscopy, Raman-spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The active layer of chemiresistive gas sensors was obtained by cold pressing (compaction) at 11 MPa of powders of bare and treated multi-walled carbon nanotubes. The sensing properties of pellets were investigated using a custom dynamic type of station at room temperature (25 ± 2 °C). Detection of NO₂ was performed in synthetic air (79 vol% N₂, 21 vol% O₂). It was found that the chemical treatment significantly affects the sensing properties of multi-walled carbon nanotubes, which is indicated by increasing the response of the sensors toward 100-500 ppm NO₂ and lower concentrations.

SUBMITTER: Lapekin NI

PROVIDER: S-EPMC9503782 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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NO<sub>2</sub> Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

Lapekin Nikita I NI Golovakhin Valeriy V VV Kim Ekaterina Yu EY Bannov Alexander G AG

Micromachines 20220908 9

This article is devoted to the investigation of the sensing behavior of chemically treated multi-walled carbon nanotubes (MWNTs) at room temperature. Chemical treatment of MWNTs was carried out with a solution of either sulfuric or chromic acids. The materials obtained were investigated by transmission electron microscopy, scanning electron microscopy, Raman-spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The active layer of chemiresistive gas sensors was obtained b ...[more]

PMID: 36144118

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Project description:The studies focusing on magnesium oxychloride cement (MOC) composites have recently become fairly widespread because of MOC's excellent mechanical properties and environmental sustainability. Numerous fillers, admixtures and nano-dopants were studied in order to improve the overall performance of MOC-based derivatives. Some of them exhibited specific flaws, such as a tendency to aggregate, increase in porosity, aeration of the composite matrix, depreciation in water resistance and mechanical strength, etc. In this manuscript, MOC-based composites doped by multi-walled carbon nanotubes (MWCNTs) are designed and tested. In order to modify the final properties of composites, diatomite was admixed as partial substitution of MgO, which was used in the composition of the researched material in excess, i.e., the majority of MgO constituted part of MOC and the rest served as fine filler. The composites were subjected to the broad experimental campaign that covered SEM (scanning electron microscopy), EDS (energy dispersive spectroscopy), HR-TEM (high-resolution transmission electron microscopy), XRD (X-ray diffraction), OM (optical microscopy) and STA-MS (simultaneous thermal analysis with mass spectroscopy). For 28 days hardened samples, macrostructural and microstructural parameters, mechanical properties, hygric and thermal characteristics were experimentally assessed. The incorporation of MWCNTs and diatomite resulted in the significant enhancement of composites' compactness, mechanical strength and stiffness and reduction in water absorption and rate of water imbibition. The thermal properties of the enriched MOC composites yielded interesting values and provided information for future modification of thermal performance of MOC composites with respect to their specific use in practice, e.g., in passive moderation of indoor climate. The combination of MWCNTs and diatomite represents a valuable modification of the MOC matrix and can be further exploited in the design and development of advanced building materials and components.

Dataset Information

NO₂ Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

Publications

NO<sub>2</sub> Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

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NO2 Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

Publications

NO<sub>2</sub> Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.

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OmicsDI is part of the ELIXIR infrastructure

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NO₂ Sensing Behavior of Compacted Chemically Treated Multi-Walled Carbon Nanotubes.