The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The structure of molten fluoride salt infiltrated graphite has been studied by X-ray diffraction and Raman spectroscopy. The full width at half maximum and asymmetry degree of the (002) diffraction peak decrease with the increase of salt weight gain in the infiltration indicates the improvement of the stacking order of the graphite by the molten salt infiltration. The shape of G′ resonance of Raman...
A simple route to achieve covalently-grafted polyaniline (PANI)/graphene oxide (GO) nanocomposites has been developed. The synthesized composites showed a uniform hierarchical morphology of the PANI thin film and short rod-like nanostructures that had densely grown on the GO sheets, in contrast to the nonuniform morphology of noncovalently-grafted PANI/GO. Compared to pure PANI and noncovalently-grafted...
The paper reports on the preparation of reduced graphene oxide (rGO) modified with nanodiamond particles composites by a simple solution phase and their use as efficient electrode in electrochemical supercapacitors. The technique relies on heating aqueous solutions of graphene oxide (GO) and nanodiamond particles (NDs) at different ratios at 100°C for 48h. The morphological properties, chemical composition...
A family of layered double hydroxides (LDHs) with varied Fe contents were employed as catalyst precursors for the controllable bulk growth of few-layer graphene/single-walled carbon nanotube (G/SWCNT) hybrids in a fluidized-bed reactor through chemical vapor deposition of methane at 950°C. All the G/SWCNT hybrids exhibited the morphology of SWCNTs interlinked with graphene layers. The purity, thermal...
Graphene/ZnO (G/ZnO) composites were synthesized for the first time by a wet chemical method. X-ray diffraction and transmission electron microscopy analyses demonstrated that ZnO nanoparticles with an average diameter of about 5nm uniformly covered the graphene surfaces. G/ZnO composites were dispersed in methyl methacrylate (MMA), polymerized at 75°C for 30–35min, and finally, dried at 45°C for...
Phosphate functionalized carbon nanodots (C-dots) with satisfactory quantum yield have been prepared through one-step acidic oxidation of sucrose by H3PO4 at low temperature (60°C). The as-prepared C-dots are monodisperse with narrow size distribution. Besides, two C-dots emitting different colors, namely green and yellow, can be easily separated by collecting the supernatant and precipitate after...
The interfacial electronic structure of MoO 3−x /graphene has been investigated using photoemission spectroscopy. The experimental data showed that upon deposition of MoO 3−x , the Fermi level of graphene shifts downward gradually from its Dirac point due to the p-type doping effect. From the Fermi level shift of −0.28eV, the hole density of graphene was estimated to be 5...
Conductive carbon additives with different surface area and particle size, alone or in different combinations, were tested as conductive additives for LiFePO 4 cathode materials in lithium ion batteries. Their influence on the conductivity, rate capability as well as the structure of the resulting electrodes was investigated. Mercury porosimetry was carried out to define the porosity and pore...
Graphene oxide (GO) paper is a promising candidate for novel applications in energy storage systems such as electrical batteries, supercapacitors and multi-layered composites where the material undergoes deformation mechanisms. In particular, the strength of graphene oxide paper is critical in such applications and is defined by the interaction between the GO sheet constituents of the paper. The deformation...
Atmospheric pressure chemical vapor deposition is employed to synthesize the N-doped graphene, which is mainly composed of pyrrolic type N bonding configuration with a controllable doping concentration from ∼1.6% to ∼6.4%. Transmission electron microscope, X-ray photoelectron spectroscopy, and Raman spectrometer are used for characterizing the pyrrolic N-doped graphene. X-ray photoelectron spectra...
Herringbone carbon nanofibers (CNFs) were efficiently produced by chemical vapor deposition on Ni nanoparticles derived from layered double hydroxide (LDH) precursors. The as-obtained CNFs with a diameter ranging from 40 to 60nm demonstrated herringbone morphologies when they grew on Ni/Al LDH derived catalysts both in the fixed-bed and fluidized-bed reactor. The Ni/Mg/Al, Ni/Cu/Al, as well as Ni/Mo/Mg/Al...
In this study, we propose a new approach, based on compensated n–p codoping, that can simultaneously address all the main shortcomings associated with single-element doping, effectively resulting in “diluted ferromagnetic graphene”. Our proposal is to deposit magnetic transitional metal (TM) atoms (such as Fe, Co, and Ni), acting as n-type dopants, onto already p-doped (e.g., by B) graphene. Through...
We reported a novel method to fabricate isotropic pyrocarbon (ISO Pc). A multi-walled carbon nanotube (MWCNT) preform (30vol.% content, in which curved MWCNTs were randomly dispersed) was first prepared and was then densified to fabricate bulk ISO Pc by fixed-bed chemical vapor deposition (CVD) at low temperatures. Microstructure analyses show that the product is isotropic on both the micro- and nano-scale...
High efficient sulfur cathode materials were constructed by the incorporation of aligned sulfur-coated carbon nanotubes (CNTs) and a polyethylene glycol (PEG) barrier at one end. During the charge and discharge of lithium sulfur batteries, high Li ion storage performance can be achieved on the composite electrode, which was benefited from both the aligned CNT structure and the polymer barrier. Aligned...
We presented a molecular-designed multi-walled carbon nanotube (MWCNT) layer-by-layer (LbL) multilayer on poly-l-lactic acid (PLLA) electrospun fibers for engineering cell/CNT interfaces. A stable, positively charged monolayer was created on the fiber surface by the aminolysis reaction of poly(ethylene imine) (PEI) with PLLA, followed by alternate deposition in negatively charged MWCNT and positively...
In order to avoid the complicated purification process of carbon nanomaterials (CNMs) and obtain high-purity CNMs, NaNO 3 powder was used as catalyst for the synthesis of CNM. By controlling the decomposition temperature (400 and 450°C), liner carbon nanofibers and helical carbon nanofibers can be selectively synthesized. Because of the used catalyst is water-soluble, it can be removed easily...
Two commercial conductive additives, carbon black (super P, SP) and vapor grown carbon fibers (VGCFs), were used to construct an effective conducting network in the cathode of commercial LiFePO 4 lithium ion batteries (LIBs). Results suggest that the LIB with SP possesses a higher discharge capacity than that with VGCFs with the same mass fraction of the additives. The high-rate capacity of...
Fullerene-like carbon (FLC) nanoparticles were prepared by depositing soot of burning castor oil. FLC core/nano-crystalline silicon (nc-Si) shell nanofibers with network structures have been fabricated by electrospinning and plasma enhanced chemical vapor deposition techniques. The morphologies and structures of the materials were characterized using scanning electron microscopy, transmission electron...
A rapid and easy approach for synthesizing chemically reduced graphene oxide (CRGO) by using formamidinesulfinic acid (FAS) as a reducing agent is reported. The obtained CRGO nanosheets were characterized with Fourier transform infrared spectroscopy, UV–Vis absorption spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, atomic force...
CoMgAl layered double hydroxides were prepared as catalysts for the in situ synchronous growth of graphene and single-walled carbon nanotubes (SWCNTs) from methane by chemical vapor deposition. The as-calcined CoMgAl layered double oxide (LDO) flakes served as the template for the deposition of graphene, and Co nanoparticles (NPs) embedded on the LDOs catalyzed the growth of SWCNTs. After the removal...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.