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A type of flexible, broadband electromagnetic microwave absorber is designed, simulated, manufactured and characterized. The multilayer-structured absorber is composed of a screen-printed carbon-based resistive film sandwiched between two layers of silicon rubber/multi-walled carbon nanotube composites and in turn backed by aluminum foil. The theoretical analysis based on the equivalent circuit model...
Carbon quantum dots (CQDs) reinforced polypyrrole nanowire (PPy-NW) was constructed via electrostatic self-assembly strategy. The as-made CQDs/PPy-NW composite demonstrated superior electrochemical properties benefited from a dotted line structure with large specific area, more active sites and outstanding electronic conductivity. As the results, the CQDs/PPy-NW composite electrode displayed a specific...
The electronic structures of carbon nanocages (CNCs) and nitrogen/phosphorus doped carbon nanocages (N-CNCs/P-CNCs) have been studied by X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and resonant X-ray emission spectroscopy (RXES). The doping configurations for N/P dopants are identified from the experiments. The results have shown that...
A type of lightweight and flexible multi-walled carbon nanotube (MWCNT)/waterborne polyurethane (WPU) composites is fabricated, which show superior shielding effectiveness (SE) of electromagnetic interference in the X-band even under the thin thickness of samples. The thickness values 0.05, 0.32 and 0.8 mm correspond to SE of 24, 49 and 80 dB, respectively. This attributes to the extremely high MWCNT...
Multi–walled carbon nanotube (MWCNT) reinforced titanium matrix composites were synthesized using a spark plasma sintering method at a low sintering temperature of 550 °C. The effects of the weight fraction of MWCNTs on the microstructures and the mechanical and thermal properties of the composites were investigated. No reaction products were detected in the composites, indicating that the MWCNTs...
Carbon fiber reinforced polymers (CFRP) have been increasingly used in aircraft structures. However, their relatively low electrical conductivity leads to the vulnerability to lightning strike. Herein, the carbon nanotube buckypaper-based coatings composed of conductive buckypaper and insulating adhesives were developed to protect the CFRP laminates. Their influence on the lightning strike protection...
Multi-walled carbon nanotubes are used to fabricate a type of environment-friendly electrothermal bimetallic actuators with the matrix of waterborne polyurethane or silicone rubber. Even under a relatively low DC driven voltage of 7V, the actuator can achieve a bending displacement up to 28mm, or a curvature up to 0.29cm−1, which are greater than most of other electrothermal actuators reported. The...
It is normally assumed that the sheet resistances under and outside the metal contact are identical when deriving specific contact resistivity of graphene from transmission line model. We considered the contact end resistance and obtained the sheet resistance under contact of 670Ω/□, which is much different from that outside the contact of 1840Ω/□. Considering the difference, the value of specific...
A novel one-step approach was developed for the large-scale synthesis of sulfur- and nitrogen-co-doped carbon dots (S–N–C-dots) by using sulfuric acid carbonization and etching of hair fiber. It was found that S and N can form different binding configurations in S–N–C-dots framework, such as –C–S– covalent bond of the thiophene-S and –C–SOx– (x=2, 3, 4, sulfate or sulfonate) for S-doped, pyridinic...
A three-dimensional complex carbon nanoneedle electron emitter film with high emission current density at low electric field has been developed by a direct current plasma chemical vapor deposition system. Sample grown on stainless wire substrate pretreated with the mixing powders of diamond and molybdenum exhibited novel film morphology. The scanning electron microscopy image taken from this film...
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