Graphene sheets that are now routinely obtained by the exfoliation/reduction of graphite oxide exhibit Raman spectra unlike traditional graphene systems. The general attributes these ‘wrinkled graphene’ first reaffirmed evaluating samples prepared seven different exfoliation-reduction methods. These highly broadened D and G bands in addition, have a modulated bump place conventional 2D (G′) band. It is shown high wavenumber ‘bump’ can be resolved into band several defect activated peaks such...

Graphene nanoplatelets have been synthesized by thermal exfoliation of graphitic oxide and nitrogen doped graphene obtained plasma treatment. used as a catalyst support for platinum nanoparticles oxygen reduction reactions in proton exchange membrane fuel cells. Platinum were dispersed over these materials using the conventional chemical technique. The morphology structure based powder samples studied X-ray diffraction, Raman spectroscopy, transmission electron microscopy photoelectron...

Ultrathin graphene (UG) has been prepared by exfoliation of graphite oxide a novel technique based on focused solar radiation. Graphene engine oil nanofluids have and their frictional characteristics (FC), antiwear (AW), extreme pressure (EP) properties evaluated. The improvement in FC, AW, EP is respectively 80, 33, 40% compared with base oil. enhancement can be attributed to the nanobearing mechanism ultimate mechanical strength graphene.

A modern technological society demands the use and storage of energy on a large scale. In this regard, development high performance supercapacitors is focus current scientific research. Graphene, due to its excellent properties, has attracted attention for supercapacitor applications. present work, graphene synthesized via hydrogen-induced exfoliation further functionalized decorate with metal oxide (RuO2, TiO2, Fe3O4) nanoparticles polyaniline using chemical route. Materials are...

Abstract Novel foam composites comprising functionalized graphene (f‐G) and polyvinylidene fluoride (PVDF) were prepared electrical conductivity electromagnetic interference (EMI) shielding efficiency of the with different mass fractions f‐G have been investigated. The increases increase in concentration insulating PVDF matrix. A dramatic change is observed from 10 −16 S · m −1 for to −4 0.5 wt.% reinforced composite, which can be attributed high‐aspect‐ratio highly conducting nature...

Herein, we report the fabrication of hydrogen gas sensors based on noble nanometal decorated one dimensional multi walled carbon nanotubes and two graphene by a simple drop casting technique, with practical applications in view. Pt functionalized sheets (Pt/f-G) (Pt/f-MWNT) were synthesized employed as sensors. Systematic investigation sensing, at low detection level 4 vol% air, reveals response time comparable to that but fold increase sensitivity room temperature. These also found be...

A novel and facile technique for the rapid synthesis of few layered graphene sheets via hydrogen induced reduction–exfoliation graphite oxide at a low temperature ∼200 °C is reported.

RuO2/MWNT, TiO2/MWNT, and SnO2/MWNT nanocrystalline composites for supercapacitor electrodes have been synthesized by chemical reduction method using functionalized MWNT respective salts. thermal catalytic vapor deposition (CCVD) over hydrogen decrepitated Mischmetal (Mm)-based AB3 alloy hydride catalysts. Structural morphological characterizations of metal oxide dispersed carried out powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM HRTEM), energy...

A high hydrogen storage capacity for palladium decorated nitrogen-doped exfoliated graphene nanocomposite is demonstrated under moderate temperature and pressure conditions. The nitrogen doping of done by plasma treatment, nanoparticles are over a modified polyol reduction technique. An increase 66% achieved in the uptake at room 2 MPa pressure. further enhancement 124% attained nanoparticle (Pd NP) decoration graphene. dispersion Pd NP sheets strengthened interaction between catalyze...

We report a novel way of synthesizing graphene-carbon nanotube hybrid nanostructure as an anode for lithium (Li) ion batteries. For this, graphene was prepared by the solar exfoliation graphite oxide, while multiwalled carbon nanotubes (MWNTs) were chemical vapor deposition method. The graphene–MWNT synthesized first modifying surface using cationic polyelectrolyte and MWNT with acid functionalization. structure obtained homogeneous mixing chemically modified constituents. This exhibits...

We report for the first time, synthesis of highly stable exfoliated graphene based nanofluids with water and ethylene glycol as base fluids out any surfactant subsequent studies on their thermal electrical conductivities. Graphene was synthesized by exfoliation oxide at 1050 °C in Ar atmosphere. The as-synthesized has been suitably functionalized further dispersed it without surfactant. Thermal conductivities these were measured varying volume fractions different temperatures. An enhancement...

Abstract A novel synthesis procedure is devised to obtain nitrogen‐doping in hydrogen‐exfoliated graphene (HEG) sheets. An anionic polyelectrolyte–conducting polymer duo used form a uniform coating of the over Pyrolysis coated with polypyrrole, nitrogen‐containing polymer, an inert environment leads incorporation nitrogen atoms network simultaneous removal polymer. These nitrogen‐doped (N‐HEG) sheets are as catalyst support for dispersing platinum and platinum–cobalt alloy nanoparticles...

The present work investigates the structural stability, dispersion, viscosity, and convective heat transfer properties of nanofluids based on multiwalled carbon nanotubes (MWCNT). Oxidative acid refluxation MWCNT was examined for different time periods in order to achieve good dispersibility thermal enhancement. Structural stability efficient chemical functionalization investigated by thermogravimetric analysis. Fourier transform infrared spectroscopy conducted ascertain formation functional...

Porous activated carbon or nanostructured materials have a promising future as hydrogen storage media. The capacity of can be further enhanced by spillover atomic from supported catalyst. In the present work, both these factors been put to test study palladium (Pd) nanoparticles dispersed over surface functionalized hydrogen-exfoliated-graphene (Pd/f-HEG). high-pressure measurements HEG and Pd/f-HEG show 0.5 1.76 wt % respectively at 25 °C 2 MPa pressure. Functionalization graphene...

Herein, we report a preparation method of novel binary hybrid nanocomposite based on polyaniline (PANI) and α-MnO2 nanotubes (MNTs) by in situpolymerization. The polymerization is carried out acidic medium using as oxidant. A symmetrical supercapacitor fabricated the electrochemical performance investigated cyclic voltammetry (CV), chronopotentiometry (CP) impedance spectroscopy (EIS) techniques 1.0 M H2SO4 electrolyte. shows maximum specific capacitance 626 F g−1 corresponding energy...

In the present work we describe a novel synthesis procedure for silver decorated functionalized hydrogen induced exfoliated graphene (Ag/HEG) and preparation of nanofluids using this material. Further, thermal conductivity convective heat transfer studies are carried out these nanofluids. A simple chemical reduction method is implemented to synthesize uniformly coated Ag/HEG characterized by different experimental techniques. used making considering high nanoparticles. has been dispersed in...

In the present work, a novel chemical reduction followed by calcination at considerably low temperature is used to synthesize copper oxide decorated graphene (CuO/HEG). Graphene has been synthesized via hydrogen induced exfoliation/reduction of graphite oxide. As-synthesized functionalized in acid medium decorate nanoparticles as well disperse it polar medium. CuO/HEG dispersed deionized (DI) water and ethylene glycol without any surfactant, thermal transport properties those nanofluids are...

Nanostructured Pt functionalized multiwalled carbon nanotubes (MWNTs) produced by catalytic chemical vapor deposition are good room-temperature hydrogen sensors. MWNTs have been synthesized of acetylene using a fixed-bed reactor over hydrides Mm0.2Tb0.8Co2 obtained through decrepitation technique. Purified and chemically treated resulting in nanostructured dispersion on CNTs. Structural, morphological, vibrational characterizations carried out XRD, SEM, TEM, HRTEM, Raman spectroscopy, FTIR...

Functionalized graphene–polyvinylidene fluoride (f-G–PVDF) nanocomposite films were synthesized using a simple solvent casting technique. The investigation demonstrates the real time strain response of f-G–PVDF nanocomposites on macro-scale under tensile loads and use this as sensor. This is ascribed to variation electrical properties graphene–polymer upon mechanical deformation at nanoscale.

A new type of flexible carbon fabric supported magnetite multiwalled nanotubes (Fe3O4-MWNTs) nanocomposite based supercapacitor was fabricated for the removal high concentration arsenic and desalination seawater. MWNTs were synthesized by a chemical vapor deposition (CVD) technique, purified air oxidation acid treatment followed further functionalization. Decoration (Fe3O4) nanoparticles over functionalized surface done technique. Fe3O4-MWNTs characterized using different characterization...