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.
Carbon nanotube (CNT) thin films have attracted great attention for their use in flexible electronics, including thin-film transistors (TFTs) and memory devices, due to their excellent optical, electrical and mechanical properties. The flexibility of current CNT TFTs is usually limited by the use of rigid inorganic oxide insulators. Gate dielectrics made of polymers are promising candidates that give...
The Monte Carlo simulation has been applied to discuss the step effect on a zigzag graphene nanoribbon structure in a longitudinal magnetic field. The effects of the singe-ion anisotropies, longitudinal magnetic fields and temperature on the magnetization plateaus have been investigated in detail. Our results show that the number of magnetization plateaus for the system dissatisfy 2S + 1 criterion...
Electron-beam (e-beam) lithography at a low energy can efficiently write deoxygenated micro-patterns on graphene oxide (GO) films with high edge-definition. The deoxygenation caused by the secondary process of back-scattered electrons leads to a shrinkage of pattern height. A lower energy e-beam is found to be more effective in deoxygenating of GO than that by using a higher energy e-beam. The thickness...
Percolating carbon nanoparticles were added into electrolyte to improve the performance of Li–S batteries. These percolating carbon nanoparticles acted as dispersible nanosized electrodes, allowed the direct electrochemical utilization of dissolved polysulfides in electrolyte, and mitigated the polysulfide shuttle. As a result, the polysulfide utilization was improved with the virtual sulfur capacity...
Single electrode materials capable of both electric double-layer and Faradic redox-based pseudo capacitance can be used for fabrication of high performance supercapacitors in an easy way and thus are highly desirable in the energy storage field. This contribution reports a new kind of such materials based on alkylated graphene materials (CnrGO, n is the carbon number of their alkyl side chains) having...
Electroactive graphene oxide (GO) interlayers between cathode and separator are examined in a lithium–sulfur cell. The GO interlayer is bifunctional and capable for lithium storage and polysulfide trapping depending on the specific surface properties. The corresponding electrochemical behaviors were evaluated by using galvanostatic charge–discharge, cyclic voltammetry and electrochemical impedance...
Carbon nanofiber webs with a hierarchically porous structure and a large surface area were developed by KOH activation of the pyrolyzed bacterial cellulose (denoted as pBC), which was extracted from the low-cost, eco-friendly and industrially producible coconut juice. The activated-pBC (denoted as A-pBC-x, x represents the mass ratio of KOH to pBC, x=5, 6 and 7) is composed of inter-welded homogeneous...
Developing a simple and cost-effective strategy to diagnose and treat cancer with a single and minimum dose through noninvasive strategies is highly challenging. Nano-sized graphene and graphene oxide (GO) are promising for biomedical applications, such as drug delivery and the photo thermal therapy of cancer. An acute promyelocytic leukemia line, such as NB4 cells, was detected by modified GO in...
A series of carbon fiber (CF)/polyether polyurethane (PU) composites were prepared by in situ polymerization and a casting compression molding technique. The influence of CF content and its pretreatment with a coupling agent and oxidation by 65%-68% (mass fraction) nitric acid on the mechanical performance, thermal properties and morphology of the composites was investigated by TGA, SEM and mechanical...
The photoluminescence (PL) quenching of water-soluble graphene oxide (GO) solution was systematically investigated in the presence of transition metal ions. Their PL spectra were analyzed by the Stern–Volmer equation, and the trend of the quenching efficiency was Fe2+>Co2+>Ni2+>Cd2+>Hg2+. The results of the steady-state and time-resolved PL spectra of the GO solution suggested that the...
SiC-encapsulated graphite was prepared by carbonization of a mixture of expanded graphite and silica sol at 1300°C for 6h, heat treatment in air at 700°C for 4h to remove unreacted surface carbon and HCl-HF etching to remove silica. XRD, TGA, TEM and SEM were used to characterize the samples. Results indicated that the fluorescence emission of the SiC-encapsulated graphite shifts from blue to yellow-green...
Carbon-based materials are important in energy storage and conversion materials, because of their different possible morphologies and superior performance. We discuss relationships between the structure and properties of carbon-based materials as the cathode of the lithium-air battery, discuss the importance of structure design and performance control, specify the research priorities for carbon-based...
Carbon-based electrocatalysts without metal or with trace metals are potentially effective in delivering robust and efficient oxygen reduction if the active sites are covalently located on a conductive support. In this report, we demonstrate that active sites on carbon nanotubes are created upon oxidation for efficient oxygen reduction to peroxide, whereas the saturation of oxygen groups at graphitic...
Graphene-based electrocatalysts have been widely investigated for their excellent performance in electrocatalytic oxygen reduction. The surface chemistry of graphene-based electrocatalysts is important for developing more efficient fuel cells and metal-air batteries. In addition, the nanostructured gas-diffusion electrode (GDE) on which the electrocatalysts are loaded needs to be carefully tailored...
A simple and environment-friendly method was used to prepare Pt/reduced graphene oxide (Pt/RGO) hybrids. This approach used a redox reaction between Na 2 PtCl 4 and graphene oxide (GO) nanosheets and a subsequent thermal reduction of the material at 200°C for 24h in a vacuum oven. In contrast to other methods that use an additional reductant to prepare Pt nanoparticles, the Pt ...
Copper–silver or copper–gold galvanic displacement could induce the reduction of graphene oxide, resulting in a fast and effective removal of the oxygen-containing groups in graphene oxide and formation of silver or gold nanoparticles on graphene sheets. A graphene oxide mediated long-range electron transfer process between copper and silver or chloroauric ions is proposed for the occurrence of the...
Pt–Cu/reduced graphene oxide (Pt–Cu/RGO) hybrids with different Pt/Cu ratios were prepared by the reduction of H 2 PtCl 6 and CuSO 4 by NaBH 4 in the presence of graphene oxide (GO). The Pt–Cu nanoparticles were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The reduction of GO was verified by ultraviolet–visible...
Multi-wall carbon nanotubes (MWCNTs) prepared by chemical vapor deposition, were pretreated by ball milling, chemical activation and ammoxidation and the influence of the pretreatment on their electrochemical capacitance was investigated. Results show that MWCNTs can be shortened and broken by ball milling and chemical activation, and as a result their surface area and pore volume are increased. However,...
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.