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The remarkable functional properties of diamond depend not only on its physical and chemical properties but also on its surface morphology. Ordered porous diamond with hierarchical structures is used in various applications in the fields of environment and energy management. However, obtaining such micro- and nanostructures via conventional techniques has proven to be challenging because of the superhardness...
Single-walled carbon nanotubes (SWCNTs) hold vast potential for future electronic devices due to their outstanding properties, however covalent functionalization often destroys the intrinsic properties of SWCNTs, thus limiting their full potential. Here, we demonstrate the fabrication of a functionalized graphene/semiconducting SWCNT (T@fG) heterostructured thin film transistor as a chemical sensor...
In this work, 1D carbon/SiC nanocomposites were fabricated by the electrospinning of polycarbosilane (PCS) and polyvinylpyrrolidone (PVP) with subsequent polymer pyrolysis and annealing treatment. The dielectric properties and electromagnetic (EM) wave absorption performance of the nanocomposites were studied over the frequency range of 2–18 GHz. By controlling the weight ratio of precursor PVP, both...
Scalable large graphene single crystals have been synthesized by using a backward faced quartz cuvette in a conventional tube furnace. The effect of the restricted chamber in controlling the graphene single crystal growth has been systematically studied by considering the influence of the flow rate and ratio of H2 and CH4 experimentally. Numerical simulations were performed to uncover the underlying...
Hierarchical structure consisting of graphene oxide (GO) grafted onto carbon fiber (CF) has been synthesized to improve the interfacial properties between the CFs and polymer matrix. The modified CFs are coated with siliconborocarbonitride (SiBCN) preceramic polymer by in situ polymerization to enhance their antioxidant and ablation properties. X-ray photoelectron spectroscopy were used to monitor...
Carbon-coated SnO2 nanowires (NWs) were fabricated and applied as electrode to study the lithiation process using in situ transmission electron microscopy. A critical coating thickness (∼9nm) was found, above which the carbon coating is able to constrain the lithiation-induced expansion of SnO2 core without failure. Theoretical modeling and numerical simulation were performed and revealed that such...
Oxidation resistance in air of three grades of nuclear graphite with different structures was compared using a standard thermogravimetric method. Differences in the oxidation behavior have been identified with respect to both (i) the rate of oxidation in identical conditions and the derived apparent activation energy and pre-exponential factor and (ii) the penetration depth of the oxidant and the...
Photoemission spectra of a C 84 film (mixture of two main isomers) have been measured and analyzed in the photon energy range from 13.4 to 129.3eV. The spectral intensities oscillate distinctly in the whole energy region. We quantitatively calculated the intensities of three lowest-binding-energy features (denoted by A–C). The A/B intensity ratios and the oscillatory behavior for individual...
A density functional theory study is performed to understand electronic structures and field emission properties of carbon nanotube–ZnO nanocontacts. The carbon nanotube–ZnO nanocontacts have high energetic stabilities and small energy gaps. The energy gaps of the nanocontacts exhibit an oscillatory behavior as a function of the length of carbon nanotubes. The ionization potentials of all carbon nanotube–ZnO...
Large-sized thin-films composed of single- and few-layered graphene have been synthesized by chemical vapor deposition (CVD) on copper foils under atmospheric pressure using ethanol or pentane as the precursor. Confocal Raman measurements, transmission electron microscopy and scanning tunneling microscopy show that the majority part of the obtained films exhibit hexagonal graphene lattice. Optical...
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