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Driven by the advent of fullerenes, carbon nanotubes and graphene, designing or tailoring sp2-rich carbon clusters in carbon based films attains very interesting properties which can be ideal in various applications. Depositing sp2-rich clusters evolve toward a three-dimensional arrangement (composed of extended, bent, and cross-linked graphite basal planes, i.e. fullerene-like carbon (FLC)) or nanocrystalline...
Nitrogen doped carbon materials, as the most promising non-metal electrocatalyst for oxygen reduction reaction (ORR), have attracted great attention because of their catalytic activities approaching to that of commercial Pt/C, good ethanol tolerance, low price and chemical stability. Here, we demonstrate the conjugated polymer-mediated synthesis of a series of nitrogen doped carbon nanoribbons (NDCNRs)...
The data storage performance, stability and reliability of the graphene memories have advanced significantly towards practical information storage applications. Using highly dispersed 4-bromobenzene functionalized RGO (BB-RGO) as two dimensional template, a new poly[(1,4-diethynylbenzene)-alt-boron dipyrro-methene]-grafted reduced graphene oxide (PDBD-g-RGO) was synthesized via Sonogashira coupling...
Amorphous carbon films are widely used as solid lubricant coating. However, the mechanism response for its superlow friction has not been well explored. The previous results indicated that graphitic tribofilms are formed at rubbing interfaces, which leading to decreasing of friction coefficient. But in some cases, the friction coefficients of graphite (0.1–0.6) are much high than the amorphous carbon...
Hierarchical carbon nanotube (CNT)@graphene (CNT@G) hybrid is regarded as a promising nanomaterial for various potential applications. The formation of well-defined catalyst nanoparticles on graphene substrate is essential for further nanostructure constructions. Herein, we report an efficient and green method to synthesize Fe nanoparticles that are uniformly anchored on the inert surfaces of graphene...
In this study, we demonstrate scalable and efficient inkjet printing of graphene flexible transparent conducting films (TCFs). The highly concentrated and stable graphene ink (3.2 mg/mL) that is dominated by 4-layer graphene flakes is achieved by means of shear exfoliation process. The printed graphene TCFs with DC conductivity of ∼4 × 104 S/m (sheet resistance 260 Ω/□ coupled with optical transparency...
In this study, alternate nonmagnetic Al2O3 and magnetic Fe3O4 multilayer nanofilms with precisely controlled thickness were deposited on carbon nanocoils by atomic layer deposition. The as-synthesized composites exhibit superior microwave absorption performance, which can be flexibly tuned by varying the thickness of each individual layer or the number of layers. The excellent absorption performance...
A room-temperature polymer-assisted transfer process is developed for large-area, single-layer graphene grown by means of chemical vapor deposition (CVD). This process leads to transferred graphene layers free of polymer contamination. The absence of polymer residues boosts the surface-enhanced Raman scattering (SERS) of the CVD graphene with gold nanoparticles (Au NPs) deposited atop by evaporation...
A small amount of graphene oxide (GO) was introduced into poly(vinylidene fluoride) (PVDF)/carbon nanotube (CNT) composites through solution compounding. The thermal conductivity, crystallization behavior of PVDF matrix, and the dispersion states of CNTs and/or CNT/GO in the PVDF composites were comparatively investigated. The results demonstrated that with the presence of only 1wt% GO, the PVDF/CNT/GO...
Electrically conductive polycarbonate (PC)/carbon nanotube (CNT) composites were prepared by melt compounding. Well-controlled voids were introduced into the PC/CNT composites by supercritical CO2 foaming technique. The dispersion of CNTs and the cellular morphology of the PC composite foams were characterized with transmission electron microscopy and scanning electron microscopy, respectively. The...
In this study, we demonstrate a flexible method for functionalizing multiwalled carbon nanotubes (MWCNTs) with polyurea (PU) coatings using molecular layer deposition (MLD). Uniform and conformal PU films can be deposited on the surface of pristine MWCNTs without any surface treatment. The PU shell thickness and wrapping amount are precisely tunable by changing the number of MLD cycles. The present...
Polystyrene (PS) composites with satisfactory electromagnetic interference (EMI) shielding performance were prepared by solution blending of PS with thermally exfoliated and reduced graphene oxide (TGO) and modified Fe3O4 nanoparticles. For comparison, Fe3O4@reduced graphene oxide (RGO) hybrid and its PS composites were also prepared. The morphologies of Fe3O4@RGO hybrid and Fe3O4 nanoparticles were...
Three dimensional (3D) graphene aerogel was prepared by in situ reduction-assembly method. Paraphenylene diamine (PPD) was used as reducing and functionalizing agent of graphene oxide in an aqueous medium with ammonia. The synthesized 3D graphene-PPD aerogel has highly porous structure, low density, high electrical conductivity and good mechanical properties. Further, epoxy/aerogel composites were...
Fullerene-like hydrogenated carbon (FL-C:H) films that exhibit ultra-low friction and wear in humid conditions have been the subject of extensive researches, but the structure–performance relationship such as the evolution of FL structures under friction is not well understood. We have prepared FL-C:H films with different FL content, and have addressed a detailed investigation on the relationship...
We report an efficient one-step approach to reduce and functionalize graphene oxide (GO) during the in situ polymerization of phenol and formaldehyde. The hydrophilic and electrically insulating GO is converted to hydrophobic and electrically conductive graphene with phenol as the main reducing agent. Simultaneously, functionalization of GO is realized by the nucleophilic substitution reaction of...
The influence of carbon nanotubes on the thermal ageing effect of the electrical conductivity of composite thin films is presented. The composite thin films comprise carbon nanotube/polyaniline nanofibers. When subject to thermal treatment, the presence of nanotubes retards the loss of dopants from the polyaniline and enhances the thermal stability in electrical conductivity of the composite thin...
Solvothermally reduced and functionalized graphene (SRFG) was obtained by refluxing graphene oxide in dimethyl formamide at 140°C. The resultant simultaneous nitrogen-doping and presence of dangling bonds on SRFG prompted us to study the evolution of structural changes with refluxing time. It is shown that the removal of oxygen-containing functional groups leaves dangling bonds during the solvothermal...
We report a simple and effective route to convert graphene oxide sheets to good quality graphene sheets using hot pressing. The reduced graphene oxide sheets obtained from graphene oxide by low temperature thermal exfoliation are annealed at 1500°C and 40MPa uniaxial pressures for 5min in vacuum. No appreciable oxygen content was observed from X-ray photoelectron spectroscopy and no D peak was detected...
Graphene sheets with different oxygen contents were prepared to functionalize the electrically insulating polymethylmethacrylate (PMMA). The influences of surface chemistry of graphene on rheological, electrical and electromagnetic interference (EMI) shielding properties of its PMMA composites were investigated. The appearance of frequency-independent storage modulus at low frequency suggests a solid-like...
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