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The fabrication and characterization of conductive tracks by laser irradiation on non-conductive multiwalled carbon nanotube/polyethylene (MWCNT/HDPE) composites is reported. Along the irradiated paths the percolation of MWCNTs is occurring, as demonstrated by field emission scanning electron and atomic force microscopies. An increment of the track conductivity of several orders of magnitude is documented...
Buckypapers, the thin sheets made from an aggregate of carbon nanotubes (CNTs), have demonstrated promising electrical and thermal conductivities. However, the high in-plane to perpendicular anisotropy makes its application as thermal interface materials difficult. In order to increase the perpendicular electrical and thermal conductivities, copper nanowires (Cu NWs) were introduced into buckypapers...
Top-down process, comprising lithography and plasma etching is widely used in very-large-scale integration due to its scalability, has the greatest potential to fabricate graphene nanoribbon based nanoelectronic devices for large-scale intergraded circuits. However, conventional plasma etching inevitably introduces plenty of damage or defects to the etched materials, which drastically degrades the...
In an early report, some of us have demonstrated that graphene-sheet films prepared by electrophoretic deposition (EPD) method have great potential as high-performance field emission cathode. We report that the field emission performance from such graphene-sheet films may be enhanced. We have investigated the correlation between topographic structures and local field emission characteristics of graphene-sheet...
Hydrogen peroxide (H 2 O 2 ) is a versatile oxidizing agent that is synthesized commercially by the reduction of oxygen in organic medium. Electrochemical technology employing a modified gas diffusion electrode (MGDE) offers a viable alternative for the industrial-scale synthesis of the oxidant. Addition of 1% (w/w) of tert-butyl-anthraquinone (TBAQ) to carbon black deposited in the...
Oligothiophene (nTP, n=1,2,3) has been used as the reductant for the first time in the preparation of graphene by the reduction of graphene oxide (GO). A simple single-step chemical approach has been developed to reduce and/or functionalize GO with nTP. The reaction takes place at room temperature under stirring of a suspension of GO and nTP in MeCN. The nTP has been grafted onto the surface of GO...
This manuscript reports a hydrothermal nanocasting method using hierarchically meso-macroporous silica monolith templates to synthesize hierarchically porous carbon monoliths. Abundant and cheap carbohydrates (i.e. sucrose, glucose and xylose) can be used as precursors for the synthesis of such monolithic carbons. The development of porosity at different post-calcination temperatures is investigated...
The spin-resolved electronic structure of graphene on Ni(111) was investigated using spin-polarized metastable deexcitation spectroscopy (SPMDS). Graphene was grown epitaxially on a Ni(111) single-crystalline surface using the ultra high vacuum chemical vapor deposition technique with benzene vapor as a precursor. At 50L (5×10 −5 Torrs), a single epitaxial layer of graphene was formed, but...
F and N co-doped reduced graphene oxide (F,N-RGO) was synthesized by annealing the mixture of N-doped reduced graphene oxide (N-RGO) and XeF 2 at 180°C. The photoluminescence (PL) properties of F,N-RGO were studied. The results show that F,N-RGO exhibits two strong ultraviolet (UV) PL centered at 365 and 310nm, and the PL at 310nm can be appropriately tuned by tailoring the N content further.
Spray deposited single-wall carbon nanotube (SWCNT) film electrodes comprising a randomly interconnected meso-porous network with high electrical conductivity and ionic mobility when immersed in an electrolyte have been investigated for applications in electrochemical capacitors. Layer-by-layer (LbL) spray deposition assembly of functionalised, oppositely charged (carboxylic COO − or amine...
Nitrogen-doped microporous carbons were fabricated by a simple chemical activation strategy in which chitosan and K 2 CO 3 were employed as the precursor and activation agent, respectively. The textural and chemical properties of the porous carbons could be easily tuned by changing the ratio of K 2 CO 3 /chitosan and activation temperature. Due to their large pore volume,...
Two-dimensional carbon belts (CBs) made of carbon nanofibers (CNFs) supported on a carbon foam (CFoam) substrate have been synthesized by a procedure involving carbonization of polyamic acid (PAA)/Ni(NO 3 ) 2 solution impregnated polyurethane foam in flowing H 2 at 700°C and catalytic chemical vapor deposition (CCVD) using C 2 H 4 as a carbon source and SO ...
Fano resonances and their strong doping dependence are observed in Raman scattering of single-layer graphene (SLG). As the Fermi level is varied by a back-gate bias, the Raman G band of SLG exhibits an asymmetric line shape near the charge neutrality point as a manifestation of a Fano resonance, whereas the line shape is symmetric when the graphene sample is electron or hole doped. However, the G...
One of the few remaining opportunities to increase heat dissipation in IC circuitry is to substantially decrease the thermal interface resistance between solid–solid contacts from source to sink. In this study, heterogeneous nanostructured mats (1–100μm thick, randomly oriented networks of nanostructures) are synthesized for use as thermal interface materials (TIMs). Recent studies suggest that mats...
Aqueous dispersions of reduced graphene oxide (rGO) and multi walled carbon nanotubes (MWCNT) were fabricated through a modified chemical reduction method. The significant advantage of the method developed here is the omission of any stabilising compound or organic solvent to obtain stable rGO–MWCNT dispersions. Significantly biological entities, in this case the enzyme glucose oxidase (GOx), can...
An investigation into the compressive and tensile behavior of a carbon fiber reinforced resin matrix composite at high strain rates is carried out using a split Hopkinson bar. All the dynamic tests are performed under the condition of stress equilibrium and constant strain rate. The results of the compressive tests show that the failure strength and strain of the composite increase with the increase...
Nitrogen ion implanted graphene (N/graphene) was investigated for its interaction with mouse fibroblast cells, human endothelial cells and rabbit blood. The results showed that cells cultured on N/graphene displayed increased cell-viability, proliferation, and stretching when compared to those cultured on pristine graphene. An clinical acceptable hemolytic rate (below 5%) and lower platelet adhesion...
A new approach for the synthesis of graphite intercalation compounds (GICs), by the help of co-intercalant molecules, has been observed. In the present work, we demonstrate the successful incorporation of fullerene (C 60 ) molecules between the graphene sheets aided by the preceding intercalation of nitric acid. The presence of intercalated C 60 between the graphene sheets is deduced...
Gas adsorption studies (CO 2 and N 2 ) over a wide pressure range on vertically, highly aligned dense double-walled carbon nanotube arrays of high purity and high specific surface area are reported. At high pressures, the adsorption capacity of these materials was found to be comparable to those of metal organic frameworks and mesoporous molecular sieves. These highly aligned CNT arrays...
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