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The effect of reduced graphene electro-catalysts and their the agglomerate sizes, the case in lead acid battery positive active material was done. Reduced graphene size distributions were achieved via shear induced fragmentation of graphene oxide paper followed by hydrazine reduction. Increased size of agglomerates were beneficial when conductive reduced graphene was used as an electro-catalyst, and...
The structural and dynamical properties of molecular wires comprised of nanographene molecules with linear aliphatic chains grafted around their periphery are studied via empirical force field-based Molecular Dynamics simulations. A detailed analysis of the internal structure of the wires is carried out, focusing on the stacking patterns of the molecules and the way side chains protrude from each...
We investigated the use of the thermal shrinkage of SU-8 resist for applying strain into graphene grown by the chemical-vapor-deposition (CVD) method. We demonstrate that the shrinkage of resist deposited on top of graphene on a substrate induces a local tensile strain within a distance of 1–2 µm from the edge of the resist. The thermal shrinkage of SU-8 allows us to design the local strain in graphene...
The mechanical properties of stacked graphene sheets with varying number of layers are examined. The stacked sheets are assembled by manually combining single layer CVD-grown graphene monolayers, resulting in a turbostratic multilayer graphene with irregular layer spacing greater than crystalline graphite. Due to the presence of multiple layers, the material is analyzed as a plate rather than a membrane...
In this paper, we propose to study the impact of very low filler content (0.005 wt.%) of graphite nanoflakes (80 nm), multi-layer (5–20 nm) and few-layer (1–2 nm) graphene on the electrical conductivity of an epoxy nanocomposite. The results highlight that an improvement of the quality of the exfoliation process of graphene, particularly in few-layer graphene/epoxy, allows decreasing the DC electrical...
We investigated the doping effects of chemical functionalization on graphene field-effect transistors (G-FETs). A pyrene backbone with an electron-withdrawing group (1-pyrenebutanoic acid succinimidyl ester, PBASE) and DMF acting as a solvent were used. The pyrene derivative was stably immobilized onto the graphene surface via π-π stacking between the two highly conjugated systems, confirmed by electric...
We herein report on transparent heterojunctions consisting of p-type CNT and n-type ZnO films on quartz substrates. For transparent electrodes, Al-doped ZnO film and graphene were used for ZnO and CNT films, respectively. These devices exhibited a rectifying diode behavior with an ideality factor of about 1.46 and an optical transmission over 80% in the visible range. Upon light illumination, the...
We study the behavior of the local density of states in an armchair graphene nanoribbon with a potential barrier, in the presence of realistic disorder due to charged impurities. The main purpose of this study it to provide, for a simplified case, information useful to establish the feasibility of an estimation of the characteristics of the barrier from a measurement of the behavior of the local density...
We present the use of covalently functionalized carbon nanostructures (CNSs) such as single-wall carbon nanotubes (SWCNTs) and graphene nanoplatelets (GNPs), as conductive nanofillers in a P3HT matrix. We propose a simple approach for the preparation of the active blends used as hole transport layer (HTL) in mesoporous perovskite solar cells (PSCs). We demonstrate that for both SWCNT and GNP nanofillers,...
In this work, we present a novel supercapacitor (SC) material based on 3D graphene foam-polyaniline (Pani)-Carbon nanotubes (CNTs) composite for supercapacitor applications. Graphenefoam was fabricated by chemical vapor deposition (CVD) on Ni foam using acetylene carbon source and hydrogen gas carrier at 700°C for 3 minutes. Next, the foam was etched in 3M HCl for an hour to remove most of Ni support...
In situ transmission electron microscopy (TEM) observation of the graphene synthesis by solid phase reaction is dealt with. For this purpose, metal-included and pristine (metal free) amorphous carbon nanofibers (CNFs) were fabricated on an edge of a graphite foil by Ar ion irradiation (Ar ion irradiation method) with and without a supply of metals at room temperature, respectively. In Ar ion irradiation...
Nitrogen-doped graphene potentially could be used in electronic devices, sensors, and energy-based devices. The bonding state between the carbon and nitrogen for each application plays an important role, e.g., the graphitic nitrogen has a high catalytic activity in fuel cell systems. However, it is still difficult to synthesize the bonding state selectivity. We conducted a nitrogen neutral beam modification...
A stochastic spectrally-controllable methodology for the precise design of 3-D nanomedia and graphene-based components with statistical parameters is introduced in this paper. The new technique develops a set of reduced-order models for a hybrid finite-difference time-domain/vector finite-element time-domain (FDTD/VFETD) formulation, tailored to comply with the specifications of nano-EMC environments...
A novel, simple and effective micromechanical technique for the synthesis of graphene supported by low density polyethylene (LDPE) is reported. This technique is based on the application of a combination of shear stress and friction force to nanographite to induce its complete exfoliation to graphene. LDPE-supported graphene multilayers of large area were prepared and their morphological, structural...
Graphene, thanks to its ability to support Surface Plasmon Polariton (SPP) waves in the Terahertz (THz) band (0.1– 10 THz), enables the miniaturization and electrical tunability of miniature antennas suited for wireless communication among nanosystems. Despite graphene antennas have been extensively analyzed by means of modeling and simulation, no experimental proof is available to date. One of the...
In this work, we provide fabrication guidelines to obtain high efficient organic solar cells exploiting graphene as substitute to ITO transparent electrode. The design is performed through multi-scale simulations, ranging from the atomistic level by means of ab-initio calculations of the contact, up to the device level through drift-diffusion models, including also excitonic transport. Optical modelling...
Graphene is deposited directly on a non-metal substrate, i.e. SiO2/Si with a sacrificial copper film. The copper film is either evaporated during prolonged growth time or removed by wet chemical etching after CVD graphene grows on it. This leaves the graphene sticking directly to the SiO2/Si without needing any transferring process. Effects of the copper film thickness, the growth time, and the wet...
In this work we analyze the feasibility of a broadband radar absorbing material made with an aeronautical grade honeycomb panel, coated with a thin conducting film of multilayer graphene nanoplatelets (MLGs). The film is deposited over the surface of a phenolic-aramid sheet and characterized in terms of sheet resistance and thickness. The morphology of the multilayer graphene flakes is analyzed by...
Scaffolds are salient materials used in tissue engineering. Nanocomposite scaffolds act as potential drug carriers in the treatment of a variety of cancer. 3D printing allows scaffolds to be contrived with custom design thus eliminating the risks of suitable pore size for bioactivity and custom designing. This paper projects the potentiality of producing 3D printed nanostructured scaffolds using graphene...
In this work, we developed a new CVD process for the direct synthesis of N-doped graphene based on thermal CVD with inductively-coupled plasma (ICP) assistance using pure nitrogen (N2) gas source. 3D N-doped graphene foam (GP foam) was fabricated by CVD with ICP on Ni foam using acetylene (C2H2) carbon source and hydrogen (H2) gas carrier at 700–1000°C. The effects of various synthesis parameters...
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