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Hydrothermal synthesis of carbon spheres - deepdyve…

The discoveries of carbon nanotubes, fullerene, graphene and close spherical carbon shell as new kinds of materials have opened an emerging field of interdisciplinary science across a broad spectrum of disciplines. In recent decades, hollow carbon spheres (HCSs) have inspired great interests owing to their potentials in fundamental research and industrial applications such as electrode materials,,, catalysis supports,,,, supercapacitors, and hydrogen storage. Till now, various approaches have been developed for the synthesis of HCSs with low density, high specific surface area, good chemical stability, and available hollow interiors, by using many catalytic methods including template synthesis,,, solvothermal pyrolysis, microwave preparation, and direct chemical reaction,. In this respect, Mokaya and co-workers synthesized mesoporous carbon hollow spheres using mesoporous silica as template, and subsequently etched silica template to produce HCSs. Wu and co-workers prepared hollow carbon nanospheres using Fe(C5H5)2 and C5Cl6 as starting materials. Liu and co-workers developed a simple in situ template method to fabricate carbon hollow structures by the controlled thermolysis of Zn(Ac)2 in the presence of ethanol, followed by removal of ZnO cores with HCl etching. However, despite amazing achievements that have been made in HCS synthesis, most of the previously reported methods often involve complicated multi-step, energy-consuming, and time-consuming procedures or harsh post treating conditions, and highly rely on expensive or poisonous precursors and catalysts, thereby limiting facile production of HCSs on a large scale and their industrial application. In addition, the fabrication of fluorescent HCSs has not been described yet, although several literatures have reported fluorescent carbon-based materials, such as carbon nanotubes fragments,,, graphene quantum dots,, nanodiamonds, and carbon dots (CDs),. The breakthrough of synthesis of HCSs on a large scale, along with advanced functional properties, is therefore highly expected.

T1 - Synthesis of low density and high hardness carbon spheres containing nitrogen and oxygen

The FTIR analysis showedthat covalent functionalized nanocomposites exhibit a high intensity of a C-S bond This study reports on the synthesis of N-doped carbon spheres (N-CSs) by a simple syntheticprocedure.

A New Synthesis Method of Nitrogen-doped Hollow Carbon Spheres

The FTIR analysis showedthat covalent functionalized nanocomposites exhibit a high intensity of a C-S bondThis study reports on the synthesis of N-doped carbon spheres (N-CSs) by a simple syntheticprocedure.

The effect of pyrolysistemperatures and the flow rate of argon carrier gas on the size, quality and quantity of thesynthesized carbon spheres were investigated.

Synthesis and study of carbon nanotubes and carbon spheres

The presented approach for the synthesis of fluorescent HCSs is simple, involving one-step pyrolysis process (). Initially, we chose pretreated whitefish scales as the starting materials, and then carbonized them at 260°C for 2h under an atmosphere of purified nitrogen, to obtain HCSs with multicolor fluorescence (). In addition, these HCSs could further produce CDs by simply crushing down to nanoscale. The as-prepared CDs display bright cyan fluorescence under UV lamp (365nm) and disperse well into organic solvents. This result suggests that the multicolor fluorescent properties of HCSs should be originated from a number of fluorescent CDs distributed onto the surface of HCSs. The applications of CDs as the fluorescent ink of inkjet printing and the sensitizer of solar cell were also demonstrated (). On the other hand, inspired by this strategy, we further tried to explore an easier one-step method to produce multicolor fluorescent HCSs from collagen powders than from the scales, because the resource of whitefish scale is limited and the pretreatment of scale is time-consuming. Then collagen powders were employed as the precursor, pressed into tablets, and treated with thermal pyrolysis at 260°C for 2h. As expected, HCSs with multicolor fluorescence also grew up, suggesting that HCSs could be facilely produced on an industrial scale via pyrolysis of collagen powder tablets, without any pretreatments (). Still, these HCSs could be crushed down to nanoscale to form CDs.

How to cite this article: Chen, Q.-L. et al. Direct Synthesis of Multicolor Fluorescent Hollow Carbon Spheres Encapsulating Enriched Carbon Dots. Sci. Rep.6, 19382; doi: 10.1038/srep19382 (2016).

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Synthesis of mesoporous carbon nanospheres via …

Among the nanostructures of carbon materials, hollow carbon spheres (HCS) possess advantages of low density, high specific surface area, and structural feature of filling cavity, which resulting in their broad applications in drug delivery, nanoreactor, lithium-ion battery, enzymes immobilization and other fields. HCS have been usually synthesized via chemical vapor deposition, arc discharge and hydrothermal methods, which are suffered from the great difficulty in controlling size, shell thickness, surface roughness, graphitization degree, etc.

Synthesis of micro-sized SnO2@carbon hollow spheres …

Herein, hierarchically porous carbon spheres (HPCSs) were synthesized by using chitosan, glutaraldehyde and KOH as the carbon source, crosslinking agent and chemical activating agent, respectively.

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