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Spintronic systems exploit the fact that the electron current is composed of spin-up and spin-down carriers, which are more easily disturbed than electronic systems. Here, we investigate the spin transport properties of a single phenalenyl or pyrene molecule connected to zigzag graphene nanoribbon electrodes by using the non-equilibrium Green's function formalism with density functional theory. We...
Controlling magnetic transport through a single molecule remains one of the most fundamental challenges of spin electronics. Here, we investigate the effects of the redox reaction on the magnetic transport properties of a single anthraquinone (AQ) molecule connected to zigzag graphene nanoribbon electrodes by using the non-equilibrium Green's function formalism with density functional theory. Two...
Fabrication of graphitized carbon materials (e.g. carbon nanotubes and graphene) normally entails the assistance of transition metal catalyst. In this paper, a nitrogen doped carbon foam (NCF) with both graphitized and porous carbon structure was fabricated by direct pyrolysis of melamine foam (MF) without using any transition metal catalyst. The graphitized carbon structure was possibly attributed...
The development of environment-friendly electrode materials is highly desired for the clean and sustainable Li-ion batteries (LIBs) system. Organic cathode materials that involve conducting polymers, organic carbonyl/sulfur compounds are expected to be promising candidates for future LIBs with a concept of “green and sustainable”. However, their battery performances are relatively worse than that...
Graphene derivatives generated by modifying the surface oxygen functional groups of graphene oxide have been widely investigated in recent years. Graphene derivatives possess excellent aqueous solubility and biocompatibility similar to graphene oxide, which are important in their biomedical application. Research progress on the use of graphene derivatives in biological imaging, drug carriers and photodynamic...
Carbon aerogels were synthesized at room temperature by a sol–gel polymerization route using resorcinol and formaldehyde as precursors, acetonitrile as solvent and hydrochloric acid as catalyst, followed by CO 2 supercritical drying and carbonization. FT-IR, SEM, XRD and nitrogen adsorption were used to characterize the microstructure of the aerogels. Results showed that the carbon aerogels...
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...
Graphene–carbon nanotube (CNT) hybrid materials were synthesized by simple one-step chemical vapor deposition (CVD) using ethanol as precursor. On a copper foil decorated with silicon nanparticles (Si NPs), a graphene film grows uniformly on the substrate while CNTs sprout out from Si NPs to form a network on top. The density of CNTs can be controlled by the CVD growth temperature. As measured by...
To gain insights into the direct electron transfer (DET) mechanism of multi-walled carbon nanotubes (MWCNTs), we investigated the conformational changes that occur in proteins when they interact with MWCNTs. We used glucose oxidase (GOD) as an example. Using cyclic voltammetry measurements, the GOD that was immobilized on the MWCNT-modified carbon paper electrode exhibited apparent direct electrochemistry...
A simple and efficient approach for coating multiwalled carbon nanotubes (MWCNTs) with size-controllable SnO 2 nanoparticles by chemical vapor deposition has been developed using tin hydride (SnH 4 ) gas as the source of SnO 2 at 550°C. The size and coverage of SnO 2 nanoparticles can be adjusted by simply controlling the deposition time and the flow rate of the SnH...
Crumpled carbon nanosheets have been successfully synthesized via a catalyst-free solvothermal route at very low temperatures (60-100 o C), using tetrachloromethane as the carbon source and potassium as the reductant. The X-ray powder diffraction pattern indicates that the products are hexagonal graphite. Transmission and scanning electron microscopy show that the thickness of crumpled carbon...
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