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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...
In recent years, significant discoveries related to antimicrobial and adsorption properties of carbon-based nanomaterials have led to new avenues for removal of various biological and organic/inorganic contaminants in drinking water. Furthermore, progress in the synthesis of multifunctional nanocomposites paves the way for their application in advanced water treatment system design. This review article...
Nitrogen functionalization of a highly microporous activated carbon (BET surface area higher than 3000m2/g) has been achieved using the following sequence of treatments: (i) chemical oxidation using concentrated nitric acid, (ii) amidation by acyl chloride substitution with NH4NO3 and (iii) amination by Hoffman rearrangement. This reaction pathway yielded amide and amine functional groups, and a total...
Millimeter-to-centimeter scale vertically aligned carbon nanotube (VACNT) arrays are widely studied because of their immense potential in a range of applications. Catalyst control during chemical vapor deposition (CVD) is key to maintain the sustained growth of VACNT arrays. Herein, we achieved ultrafast growth of VACNT arrays using Fe/Al2O3 catalysts by ethanol-assisted two-zone CVD. One zone was...
Dispersion-printing processes are essential for the fabrication of various devices using carbon nanotubes (CNTs). Insufficient dispersion results in CNT aggregates, while excessive dispersion results in the shortening of individual CNTs. To overcome this tradeoff, we propose here a repetitive dispersion–extraction process for CNTs. Long-duration ultrasonication (for 100min) produced an aqueous dispersion...
By taking the advantage of the excellent mechanical properties and high specific surface area of graphene oxide (GO) sheets, we develop a simple and effective strategy to improve the interlaminar mechanical properties of carbon fiber reinforced plastic (CFRP) laminates. With the incorporation of graphene oxide reinforced epoxy interleaf into the interface of CFRP laminates, the Mode-I fracture toughness...
Detrimental positive feedback effect due to the semi-conductive nature of carbon nanotube (CNT) was found in Joule heating of CNT/epoxy composite adhesives. In this work a process was developed to overcome the positive feedback effect by using a buckypaper–CNT/epoxy composite plaster patch. With this process, not only the positive feedback effect can be avoided but also more uniform curing of the...
A facile one-step synthesis strategy has been developed for producing fluorescent carbon quantum dots (CQDs) from a kind of Chinese coal, Jincheng anthracite. Surface grafting of the CQDs was completed and systematically investigated by grafting with a series of organic amino molecules. It was found that the solubility and the optical properties of CQDs vary with and depend on its surface chemistry...
The limited coalescence phenomenon occurring in Pickering emulsions stabilized by solid particles allows preparing monolithic silica foams with nearly monodisperse macroscopic voids and also meso- and microporosities. After soaking of these foam hard templates with a phenolic resin, partially graphitized interconnected porous carbon monoliths can be obtained easily. Like the silica templates, these...
A highly efficient graphene nanosheet (GNS) production process based on spontaneous electrochemical reactions – (i) spontaneous lithiation reaction through the direct contact between graphite powder and Li metal in an electrolyte due to the high electrochemical potential difference; and (ii) reaction of Li inside the lithiated graphite with water – is reported. This process, with the absence of supplied...
N-doped carbon dots (NCDs) obtained by one-step reflux treatment of C3N4 with ethane diamine possess good water dispersibility, strong visible fluorescence, low toxicity, proton adsorption capacity, and photo-induced electron-accepting/donating abilities. Based on these unique properties, we demonstrate that the obtained NCDs can be used as a good fluorescent probe for cellar imaging without any further...
Carbon nanofiber webs with a hierarchically porous structure and a large surface area were developed by KOH activation of the pyrolyzed bacterial cellulose (denoted as pBC), which was extracted from the low-cost, eco-friendly and industrially producible coconut juice. The activated-pBC (denoted as A-pBC-x, x represents the mass ratio of KOH to pBC, x=5, 6 and 7) is composed of inter-welded homogeneous...
N-doped carbon materials are promising metal-free catalysts for a number of applications. In this work, a cost effective and easy method to prepare N-doped carbon nanotubes by ball milling was developed, which avoids the use of solvents and production of wastes. Melamine and urea were used as nitrogen precursors. The textural and chemical properties of the N-doped materials were characterized by N...
This paper presents an innovative and quantitative method for characterization of bulk carbons using polarized light microscopy. It yields maps of transverse preferential orientation and quantitative transverse anisotropy. It can be utilized on any region observable with an optical microscope, at any attainable scale. It requires a set of micrographs from the same region of a carbon-based sample at...
We demonstrate a novel chemical synthesis and functional doping process of vertical graphene nanosheets and other nano-carbons using natural precursors. The all-carbon electrodes are synthesized via the plasma reformation of natural fats and functionalized by microwave-assisted doping using leaf extracts from a variety of horticultural plants such as bok choy, chrysanthemum, and spinach. The resulting...
Microwave induced reaction is presented as a means to generate highly defective and oxidized carbon nanotubes (CNTs) for fabrication of supercapacitor electrodes. CNTs were treated for different durations to generate varying amounts of defects and oxidation levels. This was evidenced by increase in BET surface area, D to G ratio and oxygen content with increase in treatment time. Under the given conditions,...
The strength transfer efficiency from individual carbon nanotubes (CNTs) to micro-sized yarns is an order of magnitude lower than that for conventional textile yarns. To improve the strength transfer efficiency, a good understanding of the frictional interaction between the nanotubes in the yarn (yarn internal friction, or viscoelasticity) is needed. Here, an acoustic wave propagation method is employed...
Exfoliated graphite (obtained by rapid heating of sulfuric-acid intercalated and subsequently deacidified graphite flakes) is optionally subjected to residual acidity removal, which involves repeated washing with water, such that the pH of the wash water increases from 2 to 7. Compared to washed exfoliated graphite, the unwashed material exhibits lower specific surface area (24 vs. 45m2/g), a higher...
Reduced graphene oxide (rGO) is one of the promising sensing elements for high-performance chemoresistive sensors because of its remarkable advantages such as high surface-to-volume ratio, outstanding transparency, and flexibility. In addition, the defects on the surface of rGO, including oxygen functional groups, can act as active sites for interaction with gaseous molecules. However, the major drawback...
The results of measurements of XPS spectra and magnetic properties of powder graphene/Co composite prepared by hydrogen reduction of CoCl2·6H2O deposited on few-layers graphene matrix are presented. XPS Co 2p measurements show two sets of 2p3/2,1/2-lines belonging to oxidized and metallic Co-atoms. This means that metal in composite is partly oxidized. This conclusion is confirmed by magnetic measurements...
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