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Porous nitrogen-doped carbon vegetable-sponges (N-DCSs) have been fabricated by chemical treatment of the Cu@C precursors using HNO 3 for the first time. The obtained N-DCSs are porous three-dimensional (3D)-structure and similar to numerous agglomerated fluffy micro-vegetable-sponges. When the precursors are treated by H 2 SO 4 , carbon vegetable-sponges (CSs) without nitrogen...
Bamboo-structured carbon nanotubes (CNTs) and three-dimensional honeycomb carbons (HCs) have been prepared by the reduction pyrolysis by metallic zinc of tetrahydrofuran and glycerol, respectively. Comparative experiments showed that in situ generated zinc oxide, serving as a catalyst or template, was responsible for the formations. Galvanostatic discharge/charge evaluation revealed that both the...
Leaf-like carbon sheets have been obtained by the pyrolysis of dichloromethane and ferrocene in an autoclave in 300–600°C on Cu ribbons for 90min. The thickness of the sheets could be controlled from 50 to 200nm by adjusting the experimental parameters. The formation process was studied by observing product-evolution utilizing the real-time imaging capabilities of emission scanning electron microscope,...
A Cu@carbon (Cu@C) spherical core–shell structure has been synthesized from carbonaceous matrices containing embedded copper particles by thermal treatment at 600°C under an argon atmosphere. The matrices are prepared by reducing CuCl 2 with vitamin C (VC) in the existence of polyacrylamide (PAM) at 180°C, accompanied by the partial carbonization of VC. It is found that small Cu nanoparticles...
Carbon fibrils with length of 2–3μm formed by stacking graphite sheets of ∼10–40nm in thickness along the 〈001〉 direction were prepared by pyrolysis of tetrahydrofuran at 600°C in the existence of metallic nickel. The spacing of adjacent sheets concentrated on ∼3.8nm and ∼50nm. Metallic nickel played a catalytic role in the formation of carbon fibrils, and a possible formation process was proposed.
Monodispersed Fe 3 O 4 nanoplates between two carbon films were synthesized by pyrolyzing ferrocene and sodium oxalate in a stainless steel autoclave of 64mL capacity at 600°C. The Fe 3 O 4 nanoplates are triangular single crystals, sometimes truncated, with edge lengths ranging from 50 to 100nm. In an experiment where the pressure of the reaction system was increased,...
Uniform submicron hydrogenated amorphous carbon “test tubes”, both empty and containing nickel particles, were synthesized via the self-catalysis-decomposition of Ni(Hdmg) 2 (Hdmg=dimethylglyoxime anion) at 250°C. Since one end of the tubular carbon is always open but the other end is closed, they look like “test tubes”. Transmission electron microscopy images show they have an average inner...
Amorphous carbon nanotubes and Fe/C coaxial nanocables were synthesized by a solvothermal treatment of ferrocene and sulfur. In this process, the amount of sulfur played an important role in the formation of products. When the molar ratio of ferrocene to sulfur was 1:1, the products were amorphous carbon nanotubes and Fe/C coaxial nanocables. And as the ratio was decreased to 1:2, amorphous carbon...
Coral-like accretion of hollow carbon microspheres with thin walls has been successfully synthesized through a carbon dissolution–precipitation process, where the decomposition of cyclohexane on nickel powder, at 550°C in a sealed system, and is followed by rapid cooling. The final product is tens of microns in size with smooth and uniformly thin shell thickness of approximately 3–4nm. XRD, FESEM,...
Carbon nanofibers (CNFs) have been synthesized by co-catalyst deoxidization process by a reaction between C 2 H 5 OC 2 H 5 , Zn and Fe powder at 650°C for 10h. These nanofibers exhibit diameters of ∼80nm and lengths ranging from several micrometers to tens of micrometers. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy indicate...
Two kinds of new morphology of carbon nanomaterials, carbon nanocables and branched-nanobelts can been produced by pyrolyzing ethylene glycol monvethyl ether (CH 3 CH 2 OCH 2 CH 2 OH) with Fe as catalyst at 650–700°C. The carbon nanocables are made of two parts, the interior carbon nanowires encapsulated in the outer carbon nanotubes. For the nanocables, HRTEM images...
Helically coiled carbon nanotubes (HCNTs) with diameter of 50–100nm were obtained on a large scale by reducing ethyl ether with metallic zinc at 700°C. As the temperature was raised to 750°C, most of the products were solid carbon spheres besides HCNTs. X-ray diffraction pattern and the Raman spectroscopy indicate that the product is graphite phase. HCNTs with diameter of 50–100nm in large quantity...
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