Langmuir-Blodgett assembly of transparent graphene oxide-silver microwire hybrid films with an antibacterial property
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Li-fang Shi, Jun-zhe Liu, Jun-he Yang, Ling-fei Cai, Li-yun Shi, Han-xun Qiu Silver microwires (AgMWs) were made amphiphilic by non-covalent functionalization with poly (vinyl pyrrolidone) and hexadecyl mercaptan. The Langmuir-Blodgett (LB) technique was used to transfer graphene oxide (GO) and the functionalized AgMWs (F-AgMWs) onto a quartz substrate to obtain GO-AgMW hybrid films. The films had a high optical transparency and an antibacterial property against Escherichia coli (E. coli). It is proposed that the GO layer not o...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
Synthesis of multicolor photoluminescent carbon quantum dots functionalized with hydrocarbons of different chain lengths
We report the synthesis of novel multicolor photoluminescent carbon quantum dots (CQDs) from multi-wall carbon nanotubes, and their covalent functionalization with amines by peptide bonds. The resulting CQDs consisted of quasi-spherical graphite nanocrystals around 10 nm diameter, which were capped by amines with different hydrocarbon chains such as propylamine, octylamine, dodecylamine and octadecylamine. The introduction of nitrogen atoms and the hydrocarbon chains in the surface of the CQDs dramatically affected their photoluminescence profiles, quantum yields and solubility. The photoluminescence emission wavelength of...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
Wood-based activated carbons for supercapacitor electrodes with a sulfuric acid electrolyte
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Aleksandrs Volperts, Galina Dobele, Aivars Zhurinsh, Darya Vervikishko, Evgeny Shkolnikov, Jurijs Ozolinsh Wood-based activated carbons were synthesized in a two-stage thermochemical process using sodium hydroxide as an activator, and used as the electrode materials for supercapacitors with a sulfuric acid electrolyte. The dependence of pore structure parameters and the electrochemical properties of the activated carbons on the synthesis conditions was investigated. Results indicate that an electric double layer is formed withi...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
Synthesis of SiO2@carbon-graphene hybrids as anode materials of lithium-ion batteries
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Ling-hong Yin, Ming-bo Wu, Yan-peng Li, Gui-liang Wu, Yuan-kun Wang, Yang Wang SiO2@carbon-graphene (SiO2@C-G) hybrids with excellent electrochemical performance were prepared by the self-assembly of colloidal silica, sucrose and graphene oxide followed by ultrasonic-assisted hydrothermal and heat treatments. The mass ratio of silica to sucrose is crucial to the electrochemical performance of the resulting hybrids. A hybrid with a mass ratio of silica to sucrose of 0.15 shows the best reversible lithium storage performance, del...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
A one-step hard-templating method for the preparation of a hierarchical microporous-mesoporous carbon for lithium-sulfur batteries
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Shu-zhang Niu, Si-da Wu, Wei Lu, Quan-hong Yang, Fei-yu Kang Porous carbon materials can increase the conductivity of sulfur and restrain the shuttling of polysulfides in the electrolyte. A hierarchical microporous-mesoporous carbon (HMMC) with a large surface area and pore volume was prepared by the simple one-step carbonization of a mixture of magnesium gluconate (MG) and phenolic resin. The MG was transformed into nanosize magnesium oxide that acted as a hard template during carbonization to create mesopores. The HMMC has a h...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
Synthesis and characterization of Al2O3-C hybrid aerogels by a one-pot sol-gel method
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Rui Zhang, Ning Jiang, Xiao-jia Duan, Shuang-ling Jin, Ming-lin Jin Al2O3-C hybrid aerogels were prepared by a one-pot sol-gel method, supercritical n-hexane drying and carbonization using Al(NO3)3·9H2O as the Al2O3 source, resorcinol (R) and furfural (F) as carbon precursors, and propylene oxide (PO) as a gelation initiator. The effects of the Al2O3 contents, the R+F concentrations and the PO/Al molar ratios on the porosity of the hybrid aerogels were investigated using a constant R/F molar ratio of 0.5. It was found that the hy...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
An insight into the superior performance of a gold nanocatalyst on single wall carbon nanotubes to that on titanium dioxide and amorphous carbon for the green aerobic oxidation of aromatic alcohols
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Anne E Shanahan, Mary McNamara, James A Sullivan, Hugh J Byrne Gold nanocomposites based on three supports, single wall carbon nanotubes, carbon black and TiO2, were prepared using an in-situ reduction technique and characterized. They were tested for their suitability as heterogeneous catalysts in the green aerobic oxidation of 1-phenylethanol, 2-phenylethanol and benzylalcohol of industrial importance. For all reactions, the use of single wall carbon nanotubes as supports resulted in superior reaction efficiency and specificity f...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Preparation of diameter-controlled multi-wall carbon nanotubes by an improved floating-catalyst chemical vapor deposition method
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Ya-juan Li, Chang Ma, Jian-li Kang, Jing-li Shi, Qiang Shi, Da-heng Wu Multi-wall carbon nanotubes (MWCNTs) with controlled diameters were synthesized by an improved-floating catalyst chemical vapor deposition method, using toluene and ferrocene as a carbon source and catalyst precursor, respectively. Ferrocene was sublimed in a heater and carried as a gas mixed with toluene vapor into a reactor where MWCNTs were formed. The effects of the sublimation temperature, hydrogen content in the gas mixture and gas flow rate on the diame...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Effect of annealing temperature on the mechanical properties of flexible graphene films
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Ning-jing Song, Chun-xiang Lu, Cheng-meng Chen, Can-liang Ma, Qing-qiang Kong Free-standing graphene films (GFs) as functional materials require high mechanical performance for a convenient industrial processing. GFs were prepared from graphene oxide films by annealing temperatures from 1300 to 1700 °C, and were characterized by AFM, XRD, SEM, Raman spectroscopy and mechanical testing. Results indicate that the samples have a maximum tensile strength and fracture strain of 22.41 MPa and 2.44%, respectively and a minimum thermal c...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Fabrication of interconnected mesoporous carbon sheets for use in high-performance supercapacitors
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Xiao-ting Wang, Hao Ma, Xiao-jun He, Jing-xian Wang, Jiu-feng Han, Yong Wang Interconnected mesoporous carbon sheets (IMCSs) for use in supercapacitors were fabricated from coal tar pitch using a metal-organic framework (MOF-5) template method combined with KOH activation. The samples were characterized by transmission electron microscopy, N2 adsorption, X-ray diffraction and X-ray photoelectron spectroscopy. Results show that the specific surface area of IMCSs is in the range of 860 to 1 046 m2 g−1. The IMCS prepared under the...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Synthesis of tantalum carbide from multiwall carbon nanotubes in a molten salt medium
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Zheng-wei Cui, Xuan-ke Li, Ye Cong, Zhi-jun Dong, Guan-ming Yuan, Jiang Zhang Tantalum carbide (TaC) nanofibers and coatings were synthesized using multiwall carbon nanotubes (MWCNTs) with different structures as templates and the carbon source in a KCl-LiCl molten salt mixture (41.2/58.8 mol/mol). The TaC and MWCNTs were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and selected area electron diffraction. Results indicate that the microstructure of the MWCNTs has a distinct in...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Nuclear graphite for high temperature gas-cooled reactors
Publication date: June 2017 Source:New Carbon Materials, Volume 32, Issue 3 Author(s): Xiang-wen Zhou, Ya-ping Tang, Zhen-ming Lu, Jie Zhang, Bing Liu Since its first successful use in the CP-1 nuclear reactor in 1942, nuclear graphite has played an important role in nuclear reactors especially the high temperature gas-cooled type (HTGRs) owing to its outstanding comprehensive nuclear properties. As the most promising candidate for generation IV reactors, HTGRs have two main designs, the pebble bed reactor and the prismatic reactor. In both designs, the graphite acts as the moderator, fuel matrix, and a major core s...
Source: New Carbon Materials - August 3, 2017 Category: Chemistry Source Type: research
Growth of graphene sheets under an oxyacetylene flame without a catalyst
Publication date: April 2017 Source:New Carbon Materials, Volume 32, Issue 2 Author(s): Ling-jun Guo, Jian Peng High quality graphene sheets that had a low I D/I G and a high 2D intensity in Raman spectra were prepared by a catalyst-free acetylene flame method. The sheets were grown vertically on the surface of carbon particles to form a petal-like morphology. A high temperature, high pressure and short residence time of the flame intensified the decomposition and cyclization reactions of acetylene, leading to the formation of graphene sheets in the gas phase. The turbulent flame and the gases released during the forma...
Source: New Carbon Materials - May 26, 2017 Category: Chemistry Source Type: research
Effect of graphite/sodium nitrate ratio and reaction time on the physicochemical properties of graphene oxide
Publication date: April 2017 Source:New Carbon Materials, Volume 32, Issue 2 Author(s): Edwin T. Mombeshora, Patrick G. Ndungu, Vincent O. Nyamori Graphene oxide (GO) was synthesized by the reaction of graphite with sodium nitrate and the graphite/sodium nitrate mass ratio and the reaction time were varied in order to obtain the highest oxygen content. The GO was characterized by TEM, SEM, AFM, XRD, FT-IR, TGA, elemental analysis, and UV-vis and Raman spectroscopy. The effect of oxygen content on the physicochemical properties of GO was investigated. Results indicate that increasing the graphite to sodium nitrate rati...
Source: New Carbon Materials - May 26, 2017 Category: Chemistry Source Type: research
Graphene oxide: a novel acid catalyst for the synthesis of 2,5-dimethyl-N-phenyl pyrrole by the Paal –Knorr condensation
Publication date: April 2017 Source:New Carbon Materials, Volume 32, Issue 2 Author(s): Chun-yan Chen, Xiao-ya Guo, Guang-qiang Lu, Christian Marcus Pedersen, Yan Qiao, Xiang-lin Hou, Ying-xiong Wang Graphene oxide (GO) was used as an efficient and recyclable catalyst for the synthesis of N-substituted pyrrole using a Paal–Knorr condensation reaction between 2,5-hexanedione and aniline. The effects of reaction time, reaction temperature, solvent, catalyst loading and molar ratio of aniline to 2,5-hexanedione on the yield of 2,5-dimethyl-N-phenyl pyrrole were investigated. In situ NMR was used to follow the Paalâ...
Source: New Carbon Materials - May 26, 2017 Category: Chemistry Source Type: research
