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Current–voltage (I–V) curves for Al/CuInS2 (CIS) quantum dots (QDs) embedded in graphene-oxide layer/indium-tin-oxide devices at 300K showed a current bistability with a maximum high conductivity (ON)/low conductivity (OFF) ratio of 1×104, which was 100 times larger than the ON/OFF ratio of the device without CIS QDs. I–V curves and write-read-erase-read voltage cycles demonstrated the rewritable...
Detailed knowledge of the dispersion behavior of reduced graphene oxide (RGO) in solvents is important for its practical applications. Such behavior is expected to be different to that observed for pristine graphene, as a result of the chemically heterogeneous structure of RGO (patchwork of pristine and highly oxidized graphene domains). We have investigated the dispersibility of RGO in a wide range...
By making use of the induced transformation of graphite oxide (GO) to laser scribed graphene (LSG), the coated layers of GO/carbon nanotubes (CNTs) hybrid powders on flexible polyethylene terephthalate sheets were patterned into LSG/CNTs micro-supercapacitors (LSG/CNTs-MSCs). In the presence of CNTs with a smaller diameter, the laser-scribed LSG/CNTs-MSC was found to yield the better energy storage...
The effects of humic acid (HA) on copper (Cu(II)) adsorption onto few-layer reduced graphene oxide (FRGO) and few-layer graphene oxide (FGO) were investigated using a batch equilibration method, micro-Fourier transform infrared spectroscopy, and extended X-ray absorption fine structure spectroscopy (EXAFS). The results showed that HA was adsorbed on FRGO through π–π interaction. The adsorbed HA introduced...
A nonvolatile resistive switching random access memory (RRAM) device based on the diamond-like carbon (DLC) films and the inert metal electrodes was demonstrated. A typical unipolar resistive switching (RS) behavior without high voltage “forming process” is observed. It exhibits good scaling-down properties when negligible dependence upon the cell area is observed for VSET and IRESET decreases with...
Hybrid composite nanomaterials provide an attractive and versatile material platform for numerous emerging nano- and biomedical applications by offering the possibility to combine diverse properties which are impossible to obtain within a single material. In this work, we present the fabrication of novel hybrid diamond and amorphous diamond-like carbon (DLC) coated nanoporous alumina materials that...
In this paper, we present a new synthesis method of carbon nanotubes (CNTs)-copper (Cu) composite on a silicon substrate using combination of supercritical fluid deposition (SCFD) and electrochemical plating (ECP) process. Deposition of a Cu layer onto CNTs is carried out under supercritical condition, and the CNTs–Cu composite with high-density Cu is synthesized by additional ECP process. The Cu...
To synthesize carbon nanotube/carbon matrix (CNT/C) composites rivaling or exceeding the mechanical and electrical properties of current carbon fiber/carbon matrix composites, it is essential to align carbon nanotubes in the composite. In this work, we fabricated CNT/polyacrylonitrile (PAN) precursor composites with high degree of CNT alignment, and carbonized and graphitized them at high temperatures...
The transport characteristics of overlapped junctions of Zigzag Graphene NanoRibbons (ZGNRs) are simulated and analyzed using Non-Equilibrium Green’s function combined with the Density Functional Theory. It is found that the carriers pass through an overlapped junction via several different energy states by tunneling process. In general, the current passing across the junction is mainly due to tunneling...
We report a novel far-infrared (FIR) thermal reduction process to effectively reduce graphene oxide films for supercapacitor electrode applications. The binder-free graphene oxide films used in this study were produced by electro-spray deposition of a graphene oxide colloidal solution onto stainless steel current collectors. The reduction of graphene oxide was performed using a commercial FIR convection...
We report the growth of vertically-aligned nanotube forests, of up to 0.2mm in height, on an 85:15 sp2:sp3 carbon support with Fe catalyst. This is achieved by purely-thermal chemical vapour deposition with the catalyst pretreated in inert environments. Pretreating the catalyst in a reducing atmosphere causes catalyst diffusion into the support and the growth of defective tubes. Other sp2:sp3 compositions,...
Carbon nanotubes (CNTs) were coated on a sample of glass fiber air filter medium at atmospheric pressure and room temperature using electro-aerodynamic deposition (EAD). In the EAD method, CNTs (diameter: 50nm, length: 2–3μm) were aerosolized, electrically charged, and injected through a nozzle. A voltage was applied externally between the ground nozzle and a planar electrode on which the sample was...
The mechanical properties of graphene may be strongly affected by defects. In our work, the effects of the orientation and tilting angles of Stone–Thrower–Wales (STW, 5-7-7-5) defects on the mechanical properties of graphene have been investigated based on molecular dynamics simulations. When there is one centred STW defect including STW-1 defect and STW-2 defect, our study reveals that the orientation...
We present a direct observation of structural change in Au-incorporated carbon nanofiber (CNF) during a field emission (FE) process using an in situ transmission electron microscopy (TEM). The TEM images and their electron diffraction pattern together with electron energy loss spectroscopy (EELS) indicated that the amorphous carbon structure of CNF was transformed to hollow graphitic structure catalyzed...
Carbon has unique characteristics that make it an ideal material for use in a wide variety of electrochemical applications ranging from metal refining to electrocatalysis and fuel cells. In polymer electrolyte fuel cells (PEFCs), carbon is used as a gas diffusion layer, electrocatalyst support and oxygen reduction reaction (ORR) electrocatalyst. When used as electrocatalyst support, amorphous carbonaceous...
A transparent, gas barrier film comprised of poly(vinyl alcohol) (PVA) and graphene oxide (GO) is synthesized through combined methods of solution blending and isothermal recrystallization. The recrystallized PVA/GO film with only 0.07vol% GO gives an O2 transmission rate <0.005ccm−2day−1 and an O2 permeability <5.0×10−20cm3cmcm−2Pa−1s−1; hence, it is far superior to other blend polymer/inorganic...
Silylated graphite oxide thin films were reduced by UV light irradiation using a super high pressure Hg lamp at 95°C. The reduction of silylated graphite oxide was completed within 24h and a new pillared carbon with an interlayer spacing of 0.81nm was obtained. Pillared carbons with larger interlayer spacings of about 1.13nm were also obtained from graphite oxide silylated with octyltrichlorosilane...
Single-walled carbon nanotubes (SWCNTs) are seamless cylindrical tubes consisting of carbon atoms with diameters ranging from less than one nanometer to a few nanometers. The arrangement of carbon atoms in a SWCNT is uniquely specified by using a pair of integers (n,m) referred to as the chiral indices. While the detailed structures, such as a carbon–carbon bond length, should be important, they have...
Small angle X-ray scattering (SAXS) and powder X-ray diffraction (XRD) measurements were made on CuO-impregnated activated carbons, prepared with and without an HNO3 co-impregnant, in order to determine the effect of impregnant loading and HNO3 content on impregnant distribution. A comprehensive matrix of 30 CuO-impregnated samples with five HNO3 concentrations and six impregnant loadings was prepared...
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