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Graphene and carbon nanotube (CNT) (G/CNT) hybrid films have recently attracted great attention due to their potential of combining the merits of both one-dimensional (1D) and two-dimensional (2D) nanostructures. Here, we report a facile approach to form G/CNT hybrid films by thermal annealing of multiwalled carbon nanotube (MWNT) networks on copper foils. At elevated temperature and in the presence...
The dehydration kinetics of graphene oxide (GO) were investigated by in-situ two-dimensional grazing incident X-ray diffraction. We found that the interlayer spacing of the GO membrane gradually decreased as the annealing temperature increased and as time elapsed. Surprisingly, we observed the formation of an intermediate “water-rich” GO layers at 25 °C with an interlayer spacing of approximately...
Multilayer graphene (MLG) grown by chemical vapor deposition (CVD) is a promising material for electronic and optoelectronic devices. Understanding the stacking configuration and interlayer coupling of MLGs is technologically relevant and of importance for the device applications. Here, we reported a kind of twisted MLGs (tMLGs), in which only one twist angle was revealed from the twist-related modes,...
The commercialization of anodes for sodium ion batteries (SIBs) requires multitude approaches such as the practicality of the synthesis process, battery performance and the recycling option which most studies overlooked. Herein, we showed the scalable synthesis of self-standing sulfur-doped flexible graphene films as the anode materials for SIBs, demonstrating up to 377 mA h g−1 capacity at 100 mA g...
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...
Carbon nanocoils (CNCs) were synthesized by a thermal chemical vapor deposition (CVD) method over tin-coated type 202 stainless steel (SS) plates (Cr 15%, Mn 10%, Ni 1%). It is considered that the calcination at 900°C leads to the crazing of the SS surface, which causes the Fe (Ni) and Sn to be fully mixed and forms active Fe (Ni)–Sn–O catalyst particles suitable for the growth of CNCs. However, the...
Double-walled carbon nanotubes (DWCNTs) were synthesized by a metal-catalyst-free chemical vapor deposition method using silicon oxide nanoparticles as a catalyst. The diameters and lengths of the DWCNTs are in the ranges of 3–5nm and 1–5μm, respectively. The amount of DWCNTs produced is about 70%, while the remainder is single-walled carbon nanotubes. A heat treatment of the SiO 2 /Si substrate...
Activation parameters such as temperature and the amount of potassium hydroxide (KOH) were varied during the synthesis of activated microwave-exfoliated graphite oxide (a-MEGO) and the effects of these parameters on the specific surface area of a-MEGO and electrochemical capacitance of a-MEGO electrodes were investigated. At 800°C and a KOH/MEGO mass ratio of 6.5, a maximum specific surface area of...
High-quality double-walled carbon nanotubes (DWCNTs) thin-films have been fabricated in one-step by the catalytic chemical vapor deposition gas-flow reaction process with acetone as a carbon source in an argon flow. The DWCNTs film is formed through the self-assembly of the DWCNTs in the gas flow, which is achieved by controlling the gas rates in the synthesis reaction. The DWCNT film is self-supported...
Screen printing, as a simple and efficient method, is used to fabricate a carbon-based film for electromagnetic interference (EMI) shielding applications. The results show that carbon nanotube (CNT) sheets are more effective in providing EMI shielding compared to graphite and carbon black sheets in abroad-band frequency range due to better electron transmission. A thin printed 150μm 15wt% CNT film...
A graphite oxide (GO)/heparin–benzalkonium chloride (C12) composite was synthesized. The composite was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). XRD data showed that spacing between layers of GO increased from 0.59 to 3.256nm. This enlarged layer spacing suggested that heparin–C12 complex intercalated completely in between layers of GO. FTIR also...
Macroscopic films and fibers of chemical vapor deposition (CVD) grown carbon nanotubes (CNTs) were electrically sparked between the nanotube assemblies and the electrode of a direct current power source. Microstructural analyses showed that the electric sparking ablated the ‘hard’ amorphous shells from the CNTs in the film and reshaped them into nanosize particles. This led to the formation of the...
A novel carbon nanotube (CNT)/polystyrene (PS) hybrid miniemulsion was synthesized by an in situ process. The structure of composites in the prepared miniemulsion was characterized by scanning and transmission electron microscopes. The lubricating property of this emulsion as an additive in water-based fluid was investigated by a four-ball tribo-tester. Results confirmed that the anti-wear performance...
Multi-walled carbon nanotube (MWCNT) supported TiO 2 composite catalysts were prepared by sol–gel and hydrothermal methods. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy and N 2 -adsorption analysis were carried out to characterize the composite catalysts. In using the sol–gel method, the MWCNTs were coated with anatase TiO 2 ...
Characteristics of nanosized Pt electro-catalyst deposited on carbon nanotubes (CNTs) were studied with CO-stripping voltammogram and chronoamperometry measurements. The CNTs were pretreated by oxidation in HNO 3 , mixed HNO 3 +H 2 SO 4 and H 2 SO 4 +K 2 Cr 2 O 7 solution, respectively, to enable surface modification. Well-homogenized...
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