Preparation, characterization and properties of amine-functionalized silicon carbide/polyimide composite films

Niu, Yongan; Zhang, Xin; Zhao, Jiupeng; Tian, Yanqing; Li, Yao; Yan, Xiangqiao

doi:10.1039/c4ra02769h

Cited by 27 publications

(15 citation statements)

References 44 publications

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“…The FTIR absorption spectrum of the SiC sample contains two intense peaks with absorption maxima at 900 cm −1 and 1067 cm −1 , corresponding to the stretching vibrations of the Si–C and Si–O bonds, respectively [23]. This indicates the formation of an amorphous SiO 2 shell on the surface of SiC nanoparticles, which does not appear on the diffraction patterns of the samples.…”

Section: Resultsmentioning

confidence: 99%

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

Platonov¹,

Rumyantseva²,

Frolov³

et al. 2019

Beilstein J. Nanotechnol.

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Increasing requirements for environmental protection have led to the need for the development of control systems for exhaust gases monitored directly at high temperatures in the range of 300–800 °C. The development of high-temperature gas sensors requires the creation of new materials that are stable under these conditions. The stability of nanostructured semiconductor oxides at high temperature can be enhanced by creating composites with highly dispersed silicon carbide (SiC). In this work, ZnO and SiC nanofibers were synthesized by electrospinning of polymer solutions followed by heat treatment, which is necessary for polymer removal and crystallization of semiconductor materials. ZnO/SiC nanocomposites (15–45 mol % SiC) were obtained by mixing the components in a single homogeneous paste with subsequent thermal annealing. The composition and microstructure of the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The electrophysical and gas sensing properties of the materials were investigated by in situ conductivity measurements in the presence of the reducing gases CO and NH3 (20 ppm), in dry conditions (relative humidity at 25 °C RH25 = 0) and in humid air (RH25 = 30%) in the temperature range 400–550 °C. The ZnO/SiC nanocomposites were characterized by a higher concentration of chemisorbed oxygen, higher activation energy of conductivity, and higher sensor response towards CO and NH3 as compared with ZnO nanofibers. The obtained experimental results were interpreted in terms of the formation of an n–n heterojunction at the ZnO/SiC interface.

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Section: Resultsmentioning

confidence: 99%

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

Platonov¹,

Rumyantseva²,

Frolov³

et al. 2019

Beilstein J. Nanotechnol.

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“…The surface modifications of metal oxide NPs by silane coupling agents improve the compatibility of NP surface (hydrophilic) with a hydrophobic polymer surface. Also increases the dispersion stability in organic media [88,89]. PEG, amino, vinyl and phenyl are some of the popular functional groups at the other end of these silane coupling agents.…”

Section: Silanesmentioning

confidence: 99%

A review of current coupling agents for modification of metal oxide nanoparticles

Mallakpour

Madani

2015

Progress in Organic Coatings

249

116

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“…Currently, polyimide (PI) has been attracting much attention due to its excellent thermal stability, mechanical properties and low electrical conductivity. However, PI has a low thermal conductivity coefficient ( k = 0.18 W/m K), limiting its wide application in devices requiring high thermal conductivity …”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity and mechanical properties of polyimide composites with mixed fillers of BN flakes and SiC@SiO₂ whiskers

Yang

Gao²,

Lei

et al. 2020

Polymer Engineering & Sci

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Polyimide (PI) composites with mixed fillers of BN flakes and SiC whiskers exhibit enhanced thermal conductivity and mechanical properties. In order to improve dispersion and interaction of these mixed fillers within the PI matrix, BN flakes were modified by a titanate coupling agent while SiC whiskers were oxidized at 750 C for 60 minutes to produce SiC@SiO 2 followed by silane coupling agent modification. PI composites reached a maximum thermal conductivity of 0.95 W/m K at volume fraction of mixed fillers of 27.6 vol% when the weight ratio of BN flakes to SiC@SiO 2 whiskers was 1:4. The enhanced thermal conductivity is likely attributed to the formation of heat conductive networks constructed by BN flakes and SiC@SiO 2 whiskers and the improved interfacial affinity between fillers and matrix. The optimized Nielsen-mold confirms the distribution and morphology of fillers affect the thermal conductivity of PI composites. In addition, SiC whiskers enhanced the mechanical property of PI composites and the influence of fillers on the mechanical property was further elaborated.

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Preparation, characterization and properties of amine-functionalized silicon carbide/polyimide composite films

Cited by 27 publications

References 44 publications

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

A review of current coupling agents for modification of metal oxide nanoparticles

Thermal conductivity and mechanical properties of polyimide composites with mixed fillers of BN flakes and SiC@SiO₂ whiskers

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Preparation, characterization and properties of amine-functionalized silicon carbide/polyimide composite films

Cited by 27 publications

References 44 publications

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

High-temperature resistive gas sensors based on ZnO/SiC nanocomposites

A review of current coupling agents for modification of metal oxide nanoparticles

Thermal conductivity and mechanical properties of polyimide composites with mixed fillers of BN flakes and SiC@SiO2 whiskers

Contact Info

Product

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Thermal conductivity and mechanical properties of polyimide composites with mixed fillers of BN flakes and SiC@SiO₂ whiskers