Journal ArticleDOI
One-Step Fabrication of Ceramic and Carbon Nanotube (CNT) Composites by In Situ Growth of CNTs
TLDR
In this article, the in situ growth of CNTs is realized by premixing a metal catalyst in the precursor and adding a hydrocarbon (ethanol) at a certain pyrolysis temperature.Abstract:
A ceramic (SiOC) and carbon nanotube (CNT) composite (SiOC/CNT) is fabricated by a one-step process via the in situ growth of CNTs in a ceramic body during its formation from a polymer precursor (polysiloxane) by pyrolysis. The in situ growth of CNTs is realized by premixing a metal catalyst in the precursor and adding a hydrocarbon (ethanol) at a certain pyrolysis temperature. The CNTs grow inside the pores that are developed in the ceramics at the intermediate stage of pyrolysis through catalytic cracking of the hydrocarbon by the metal catalyst particles nestling in the pores during ceramic formation. The subsequent pyrolysis at a higher temperature leads to densification of the ceramic dispersed with the in situ-grown CNTs. Microstructural observation reveals a homogeneous growth of crystallized multiple-walled CNTs in nanosize pores formed in the ceramic. The in situ-grown CNTs combine well with the ceramic matrix that forms a strong interface bonding. The in situgrown CNTs increase the electrical conductivity of the ceramics by eight orders of magnitude compared with a CNT-free SiOC ceramic. This in situ growth strategy can be generalized as the fabrication of ceramic–CNT composites with promising mechanical and electrical properties.read more
Citations
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Towards physical properties tailoring of carbon nanotubes-reinforced ceramic matrix composites
TL;DR: Carbon nanotubes (CNTs) have been considered as a new promising reinforcement for ceramic matrix composites over the last decade, owing to their exceptional properties as mentioned in this paper, however, gaining further control over challenging CNTs dispersion is still an important issue with the aim of tailoring multifunctional properties of CNT-reinforced CMCs.
Journal ArticleDOI
Improved dielectric and electromagnetic interference shielding properties of ferrocene-modified polycarbosilane derived SiC/C composite ceramics
TL;DR: In this paper, the microstructure evolutions, dielectric properties, EMI and microwave absorption properties of SiC/C composite ceramics were investigated, and the increase of both ferrocene contents and annealing temperatures led to the increases of crystallizations of SiCs and carbons.
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A novel visible-light-response plasmonic photocatalyst CNT/Ag/AgBr and its photocatalytic properties
TL;DR: A facile, one-step synthesis of carbon nanotube (CNT)-loaded Ag/AgBr hybrid material was reported and the possible degradation path of the MO dye was proposed, showing that a small amount of CNT was beneficial for photo-generated electron transfer, which could enhance the photoactivity of C NT/Ag/Ag Br.
Journal ArticleDOI
Effect of single-walled carbon nanotubes on thermal and electrical properties of silicon nitride processed using spark plasma sintering
TL;DR: In this paper, a Si 3 N 4 nanocomposites reinforced with 1-, 2-, and 6-vol% single-walled carbon nanotubes (SWNTs) were processed using spark plasma sintering (SPS) in order to control the thermal and electrical properties of the ceramic.
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Improved dielectric properties of PDCs-SiCN by in-situ fabricated nano-structured carbons
TL;DR: In this paper, nano-structured carbons were in-situ fabricated in PDCs-SiCN by pyrolysis of ferrocene-modified polysilazane.
References
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Single-wall carbon nanotubes as attractive toughening agents in alumina-based nanocomposites
TL;DR: This work fabricated fully dense nanocomposites of single-wall carbon nanotubes with nanocrystalline alumina (Al2O3) matrix at sintering temperatures as low as 1,150 °C by spark-plasma sintered, demonstrating their potential use in reinforcing nanocrystaline ceramics.
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The catalyst in the CCVD of carbon nanotubes—a review
TL;DR: In this paper, the role played by the catalytic chemical vapor deposition (CCVD) of CNTs is discussed, in particular the influence of the composition of the catalyst material, morphology of the nanoparticles, support, preparation method, and reduction pretreatment.
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Carbon nanotube-metal-oxide nanocomposites: microstructure, electrical conductivity and mechanical properties
Emmanuel Flahaut,Alain Peigney,Christophe Laurent,Ch. Marlière,Françoise Chastel,Abel Rousset +5 more
TL;DR: In this paper, the percolation of the carbon nanotubes was studied and discussed in relation to the nature of the matrix, the electrical conductivity, the fracture strength and the fracture toughness.
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Silazane derived ceramics and related materials
TL;DR: In this paper, the synthesis, processing and properties of non-oxide silicon-based ceramic materials derived from silazanes and polysilazanes are discussed and a comprehensive review of the preparation of precursor compounds containing Si-N-Si units, including commercially available materials, is provided.
Journal ArticleDOI
Contact-damage-resistant ceramic/single-wall carbon nanotubes and ceramic/graphite composites
TL;DR: It is argued that the highly shear-deformable SWNTs or graphite heterogeneities in the Composites help redistribute the stress field under indentation, imparting the composites with contact-damage resistance.