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The data storage performance, stability and reliability of the graphene memories have advanced significantly towards practical information storage applications. Using highly dispersed 4-bromobenzene functionalized RGO (BB-RGO) as two dimensional template, a new poly[(1,4-diethynylbenzene)-alt-boron dipyrro-methene]-grafted reduced graphene oxide (PDBD-g-RGO) was synthesized via Sonogashira coupling...
Radicals can form at the edges and defect sites on graphene plane. However, the radical content of graphene is too low to be practically useful. This study demonstrates how the radical content of graphene can be enhanced and optimized simply by oxidation and reduction treatments. Graphene oxide nanosheets are produced by oxidation of graphite and different reduction methods including thermal, chemical...
In spite of high mean transfer number and catalytic ability of the oxygen reduction reaction (ORR), α-MnO2 is lack of electric conductivity and specific surface area to fully exert the performance of rechargeable Zn-air battery. Here, carbons in various forms are chosen as substrates for uniform dispersion of α-MnO2 to form air electrode catalysts to evaluate the influences of carbon types on the...
A proof-of-concept of the enhancement in thermoelectric properties using C/BCN core/shell nanotube heterojunctions has been reported. We demonstrated a scalable two-step reaction route to produce C/BCN core/shell nanotubes with bulk quantities. Systematic X-ray photoelectron spectroscopy (XPS) and atomic-scale high-resolution transmission electron microscope electron energy loss spectroscopy (HRTEM-EELS)...
Graphene has attracted interest for a number of applications ranging from electronics, optoelectronics to membrane-based technologies. The thermal reduction of chemically exfoliated graphene oxide (GO) sheets represents an important step for large-scale, solution-based graphene synthesis. Therefore, understanding the reduction process and being able to provide new handles to control the resulting...
Using both tight-binding model and ab initio calculations, we investigate a system of polyene-bridged armchair carbon nanotube electrodes to address quantum transport through junctions with multiple conjugated molecules. Both one-polyene and two-polyene cases are considered. The ab initio results of the two-polyene cases show the interference effect in transmission and its strong dependence on the...
We report semiconducting behavior of monolayer graphene enabled through plasma activation of substrate surfaces. The graphene devices are fabricated by mechanical exfoliation onto pre-processed SiO2/Si substrates. Contrary to pristine graphene, these graphene samples exhibit a transport gap as well as nonlinear transfer characteristics, a large on/off ratio of 600 at cryogenic temperatures, and an...
The graphene supported precious metal nanocrystal composites have attracted tremendous attention in the field of catalysis/electrocatalysis. In this work, we demonstrate a facile co-chemical reduction approach for the synthesis of the reduced graphene oxide (RGO) supported Pt–Cu alloy nanocrystal (Pt–Cu/RGO) composites. The electrostatic interaction between graphene oxide (GO) and polyallylamine-metal...
A novel kind of N-doped hierarchically porous carbon materials (HPC-Ns) has been successfully synthesized with hierarchically macro/mesoporous silica as a hard template followed by a simple N-doping procedure using low-cost and nontoxic urea as the nitrogen source. The synthesized HPC-N samples demonstrated extensive three-dimensional (3D) connected macroporosity and partially ordered mesoporosity,...
Polystyrene (PS) composites with satisfactory electromagnetic interference (EMI) shielding performance were prepared by solution blending of PS with thermally exfoliated and reduced graphene oxide (TGO) and modified Fe3O4 nanoparticles. For comparison, Fe3O4@reduced graphene oxide (RGO) hybrid and its PS composites were also prepared. The morphologies of Fe3O4@RGO hybrid and Fe3O4 nanoparticles were...
Nitrogen-doped graphene nanosheets (N-GNSs) were used as a conductive filler for a polymer resin adhesive and as a performance improver for a silver-filled electrically conductive adhesive (ECA). The N-GNS samples were prepared by the chemical-intercalation/thermal-exfoliation of graphite followed by a thermal treatment in NH 3 . Only 1wt.% of N-GNSs was required for the adhesive to reach...
Hierarchically porous carbon monoliths (HPCMs) with both ordered hexagonal mesoporosity and three-dimensionally connected macroporosity were synthesized via a simple and time-saving hydrothermal process followed by a nanocasting pathway. These monoliths have high macropore volumes and specific surface areas, strong hydrophobicity, low densities and regular shapes. Importantly, these HPCMs showed excellent...
We present prominent photoresponse of bio-inspired graphene-based phototransistors sensitized with chlorophyll molecules. The hybrid graphene-chlorophyll phototransistors exhibit a high gain of 10 6 electrons per photon and a high responsivity of 10 6 A/W, which can be attributed to the integration of high-mobility graphene and the photosensitive chlorophyll molecules. The charge transfer...
The carbon source and growth conditions for single-walled carbon nanotube (SWCNT) growth in hot-wall chemical vapor deposition affect the chirality of the SWCNT ensemble produced. Raman spectroscopy elucidates the trends of the SWCNT semiconducting percentage grown under different conditions. Field-effect transistors using few SWCNTs per transistor were fabricated to allow for a semiconducting SWCNT...
Composite films consisting of polypyrrole (PPy) and graphene oxide (GO) were electrochemically synthesized by electrooxidation of 0.1M pyrrole in aqueous solution containing appropriate amounts of GO. Simultaneous chronoamperometric growth profiles and frequency changes on a quartz crystal microbalance showed that the anionic GO was incorporated in the growing GO/PPy composite to maintain its electrical...
A soluble graphene oxide (GO) covalently functionalized with zinc phthalocyanine (PcZn), GO–PcZn, was synthesized by an amidation reaction. The formation of an amido bond between PcZn and GO has been confirmed by X-ray photoelectron and Fourier transform infrared spectroscopy. At the same level of linear extinction coefficient, GO–PcZn exhibited much larger nonlinear optical extinction coefficients...
Amino-functionalization of carbon nanotubes (CNTs) attached to carbon paper (CP) has been achieved using one synthesis protocol: (i) chemical oxidation, (ii) acyl chlorination, and (iii) amidation. The amidation reaction of the carboxylic groups in oxidized the CNT/CP hybrids enables the formation of terminal amino groups on the CNT sidewalls. The functionalized CNTs were characterized by Raman spectroscopy,...
A soluble polyhedral oligomeric silsesquioxane (POSS) functionalized multi-walled carbon nanotube (MWCNT) hybrid material (MWCNT/POSS) was synthesized, in which the POSS content was estimated to be 44wt.%. This material exhibits a remarkable optical limiting performance for nanosecond laser pulses at 532nm. Thermally-induced nonlinear scattering is the primary mechanism for the nonlinear optical response...
The sidewalls of multiwalled carbon nanotubes (MWCNTs) were decorated with CdS nanoparticles using a mild two-step approach, with in situ polymerized thiophene (PTh) acting as an interlinker. Extensive characterization of the materials has been carried out using transmission electron microscopy, selected area electron diffraction, X-ray diffraction, thermal gravimetric analysis, ultraviolet–visible...
The study examines the water/oil repellency and the sliding behavior of carbon papers (CPs) decorated with carbon nanotube (CNT) forest, prepared by using a catalytic chemical vapor deposition. The topography showed that CNTs with 20–40nm grown on CPs form a hierarchical nano/submicron scale roughness. The CNT–CP composite surface with a thin fluoro-silica coating exhibits excellent water/oil repellency...
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