Structure and electrical transport properties of carbon nanofibres/carbon nanotubes 3D hierarchical nanocomposites: Impact of the concentration of acetylacetonate catalyst

Zambrzycki, Marcel; Łoś, Szymon

doi:10.1016/j.ceramint.2020.09.269

Cited by 13 publications

(15 citation statements)

References 59 publications

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“…In order to assess the structural parameters of the tested carbon nanofiber samples, Raman spectroscopy was performed. There are two main characteristic bands in carbon materials, namely the G and D bands [ 25 , 26 , 27 ]. The G band corresponds to the C–C radial stretching of sp 2 carbon and is characteristic of well-ordered carbon structures.…”

Section: Resultsmentioning

confidence: 99%

Influence of Heat Treatment of Electrospun Carbon Nanofibers on Biological Response

Markowski

Zambrzycki

Smółka

et al. 2022

IJMS

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The main aim of this study is to investigate the effect of fragmentation of electrospun carbon nanofibers (eCNFs) obtained at different temperatures, i.e., at 750 °C, 1000 °C, 1500 °C, 1750 °C and 2000 °C on the cellular response in vitro. In order to assess the influence of nanofibers on biological response, it was necessary to conduct physicochemical, microstructural and structural studies such as SEM, XPS, Raman spectroscopy, HRTEM and surface wettability of the obtained materials. During the in vitro study, all samples made contact with the human chondrocyte CHON-001 cell lines. The key study was to assess the genotoxicity of eCNFs using the comet test after 1 h or 24 h. Special attention was paid to the degree of crystallinity of the nanofibers, the dimensions of the degradation products and the presence of functional groups on their surface. A detailed analysis showed that the key determinant of the genotoxic effect is the surface chemistry. The presence of nitrogen-containing groups as a product of the decomposition of nitrile groups has an influence on the biological response, leading to mutations in the DNA. This effect was observed only for samples carbonized at lower temperatures, i.e., 750 °C and 1000 °C. These results are important with respect to selecting the temperature of thermal treatment of eCNFs dedicated for medical and environmental functions due to the minimization of the genotoxic effect of these materials.

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Section: Resultsmentioning

confidence: 99%

Influence of Heat Treatment of Electrospun Carbon Nanofibers on Biological Response

Markowski

Zambrzycki

Smółka

et al. 2022

IJMS

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“…This indicates that carbon black had a strongly disordered structure, with a large number of sp 3 bonds and defects, while the structures of SG and GN were highly ordered and crystalline. Here it should be emphasized that the degree of structural ordering and sp 2 carbon percentage is strictly related to the electrical conductivity of carbon materials and it can be expected that conductivity of fillers should be in some way proportional to the reciprocal of the I D /I G ratio [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Secondary Carbon Nanofillers on the Electrical, Thermal, and Mechanical Properties of Conductive Hybrid Composites Based on Epoxy Resin and Graphite

2021

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In this work, we present a comparative study of the impact of secondary carbon nanofillers on the electrical and thermal conductivity, thermal stability, and mechanical properties of hybrid conductive polymer composites (CPC) based on high loadings of synthetic graphite and epoxy resin. Two different carbon nanofillers were chosen for the investigation—low-cost multi-layered graphene nanoplatelets (GN) and carbon black (CB), which were aimed at improving the overall performance of composites. The samples were obtained by a simple, inexpensive, and effective compression molding technique, and were investigated by the means of, i.a., scanning electron microscopy, Raman spectroscopy, electrical conductivity measurements, laser flash analysis, and thermogravimetry. The tests performed revealed that, due to the exceptional electronic transport properties of GN, its relatively low specific surface area, good aspect ratio, and nanometric sizes of particles, a notable improvement in the overall characteristics of the composites (best results for 4 wt % of GN; σ = 266.7 S cm−1; λ = 40.6 W mK−1; fl. strength = 40.1 MPa). In turn, the addition of CB resulted in a limited improvement in mechanical properties, and a deterioration in electrical and thermal properties, mainly due to the too high specific surface area of this nanofiller. The results obtained were compared with US Department of Energy recommendations regarding properties of materials for bipolar plates in fuel cells. As shown, the materials developed significantly exceed the recommended values of the majority of the most important parameters, indicating high potential application of the composites obtained.

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“…A two-stage process includes (i) the preparation and heat treatment of electrospun carbon nanofibers, and (ii) their modification by CNT synthesis on the nanofiber surface by catalytic chemical vapor deposition (CCVD). The synthesis of hierarchical nanocomposites was previously fully described [ 15 , 17 ]. The synthesis of eCNF includes only first-step electrospinning without adding a precursor for growth of nanotubes and thermal treatment.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…During the thermal treatment, the nanofibers carbonize and the metal precursor decomposes, leaving evenly distributed metal nanoparticles that catalyze the growth of the nanotubes. The used catalyst precursor also influences the properties of the synthesized nanocomposite [11,15]. This paper proposes the use of a number of materials as an intermediate layer in ion-selective electrodes: Carbon nanofibers have already been used as solid contact for the determination of the multichiral drug moxifloxacin [16].…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical Nanocomposites Electrospun Carbon NanoFibers/Carbon Nanotubes as a Structural Element of Potentiometric Sensors

et al. 2022

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This work proposes new carbon materials for intermediate layers in solid-contact electrodes sensitive for potassium ions. The group of tested materials includes electrospun carbon nanofibers, electrospun carbon nanofibers with incorporated cobalt nanoparticles and hierarchical nanocomposites composed of carbon nanotubes deposited on nanofibers with different metal nanoparticles (cobalt or nickel) and nanotube density (high or low). Materials were characterized using scanning electron microscopy and contact angle microscopy. Electrical parameters of ready-to-use electrodes were characterized using chronopotentiometry and electrochemical impedance spectroscopy. The best results were obtained for potassium electrodes with carbon nanofibers with nickel-cobalt nanoparticles and high density of nanotubes layer: the highest capacity value (330 µF), the lowest detection limit (10−6.3 M), the widest linear range (10−6–10−1) and the best reproducibility of normal potential (0.9 mV). On the other hand the best potential reversibility, the lowest potential drift (20 μV·h−1) in the long-term test and the best hydrophobicity (contact angle 168°) were obtained for electrode with carbon nanofibers with cobalt nanoparticles and high density of carbon nanotubes. The proposed electrodes can be used successfully in potassium analysis of real samples as shown in the example of tomato juices.

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Structure and electrical transport properties of carbon nanofibres/carbon nanotubes 3D hierarchical nanocomposites: Impact of the concentration of acetylacetonate catalyst

Cited by 13 publications

References 59 publications

Influence of Heat Treatment of Electrospun Carbon Nanofibers on Biological Response

Influence of Heat Treatment of Electrospun Carbon Nanofibers on Biological Response

Effect of Secondary Carbon Nanofillers on the Electrical, Thermal, and Mechanical Properties of Conductive Hybrid Composites Based on Epoxy Resin and Graphite

Hierarchical Nanocomposites Electrospun Carbon NanoFibers/Carbon Nanotubes as a Structural Element of Potentiometric Sensors

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