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Weavable color-change materials are useful in smart textiles. Here we demonstrate static and programmable color change on flexible polydiacetylene (PDA) coated carbon nanotube (CNT) yarns through 3D hopping-conduction-induced electrochromism. The color change could be achieved using pre-patterning and further specified through defining the current paths. Mild heating before polymerization was used...
Harvesting energy from multiple sources in our living environment is highly demanded, not only to cope with the increasing energy crises, but also to realize the self-powered electronics. Here we propose a graphene based two dimensional (2D) hybrid nanogenerator which can generate electricity through capturing sunlight as well as water flow. This 2D nanogenerator is mainly based on a graphene/silicon...
A facile and cost-effective approach to electrodes made from nitrogen-doped carbonized cotton is disclosed. These are further used in flexible supercapacitors. The resulting supercapacitors have a specific capacitance of 207 F/g at 1.0 A/g, high energy density of 7.2 Wh/kg at 1.0 A/g, and power density of 3823 W/kg at 14 A/g. The composite also demonstrates excellent long-term cycling stability with...
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...
The development of highly efficient visible-excited charge separation photo active materials has attracted great attention for solving the global energy crisis and environmental problems. In this paper, p-type BiOBr nanoplates decorated n-type nitrogen doped graphene (BiOBr-NGR) composites are constructed by a facile wet chemical method. The formation of p-n junctions was beneficial to the efficient...
In present work, we demonstrate a synchronous carbonization and graphitization process to produce nanoporous graphitic carbon materials, using glucose as carbon source, and Ni-Dimethylglyoxime-complex, Ni(dmgH)2, as graphitization agent. The carbon samples exhibit good graphitic feature at the low carbonization temperature of 800 °C, with the BET surface area of 584 m2 g−1, and pore volume of 0.76 cm...
Thermal transport across graphene/hexagonal boron nitride (h-BN) nanoribbon interface is investigated using nonequilibrium molecular dynamics method. It is found that the heat current runs preferentially from the h-BN to graphene domain, which demonstrates pronounced thermal rectification behavior in this heterostructure. The observed phenomena can be attributed to the resonance effect between out-of-plane...
Highly compressible three-dimensional graphene aerogels with anisotropic porous structure are fabricated by directional freezing of graphene hydrogel using anisotropically grown ice crystals as templates followed by freeze–drying. The directional freezing approach endows the graphene aerogel with a high compressive strength in the axial direction and good compressibility in both axial and radial directions...
The Dirac bands and flat bands are difficult to coexist because they represent two extreme ends of electronic properties. However, in this paper, we propose a carbon-Kagome-lattice (CKL) family based on first-principles calculations, and the coexistence of Dirac and flat bands are observed in this series of three-dimensional carbon structures. The flat bands are originated from the orbital interactions...
As phase change composites, high thermal conductivity, large latent heat of fusion and good shape stability are all required for practical applications. By combining defect-free graphene nanoplatelets (GNPs) and microcrystalline cellulose, lightweight cellulose/GNP aerogels are fabricated and their highly porous but strong three-dimensional networks benefit the encapsulation of polyethylene glycol...
We report a facile approach to the low-temperature hydrothermal fabrication of a 2H–MoS2 nanosheets array on carbon cloth (2H–MoS2 NS/CC). Li-intercalation was used to prepare 1T-MoS2 sheets from pristine 2H–MoS2 NS/CC. X-ray photoelectron spectroscopy (XPS) and Raman spectra confirmed the local phase transitions from trigonal prismatic (2H–MoS2) into octahedrally coordinated Mo (1T-MoS2). Then, we...
We demonstrate the growth of high quality single-walled carbon nanotube (SWCNT) forests on commercial Cu foils by cold-wall chemical vapor deposition. Time-of-flight secondary ion mass spectrometry was employed to study the effect of annealing on the catalyst evolution with or without an AlOx barrier layer. X-ray photoelectron spectroscopy was used to investigate the chemical states of the catalyst...
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...
Light-weight porous poly(vinyl alcohol) (PVA)/reduced graphene oxide (rGO) composites were prepared by freeze-drying method. The effects of doping rGO nanosheets on the free volume and the thermal conductivity were systematically investigated. Experimental results indicated that the free volume decreased after addition of rGO due to the interfacial interaction between rGO and PVA, such as hydrogen...
Corrosion of metals causes tremendous financial loss and disasters every year. Graphene is a promising candidate for anti-corrosion coating, due to its unique properties, e.g. chemical inertness, impermeability and high conductivity. Despite being a commercially important material, it is difficult to grow graphene on carbon steels and is therefore prominently grown on copper or nickel substrates....
In-situ two-dimensional grazing incidence X-ray diffraction was applied in isothermal growth of graphene on nickel through chemical vapor deposition. The analyses showed that the graphene interlayer spacing decreases with the increasing number of graphene layers (growth time increase). Moreover, the as-deposited graphene can be gradually removed through in-situ Ar annealing treatment and inverse interlayer...
Monotonic and cyclic tensile loading experiments were conducted for analyzing elastoplastic deformation and failure of carbon nanotube (CNT) fibers. The deformation stages of the CNT fibers under tensile loads consist of a short elastic stage and a long-lasting plastic stage, while the elastic stage of the CNT fibers can be generally divided into two parts: a perfect-elastic stage and an elastic-like...
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