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Xiong Y.,Hunan University | Xiong Y.,Changsha Aeronautical Vocational Technical College | Chen X.-H.,Hunan University | Huang Q.,Hunan University | Xu L.-S.,Xiamen University of Technology
Advanced Materials Research | Year: 2013

Polypropylene (PP)-coated multi-walled carbon nanotubes (MWNTs) composite with MWNTs exceptional alignment dispersed and improved mechanical properties was prepared with maleic anhydride (MAH) as a compatibilizer and poly (butyl methacrylate) (PBMA) as a binding. Scanning electron microscopy (SEM) results showed that MWNTs within composite were aligned without aggregation and the oriented MWNTs were connected by matrix. High-resolution transmission electron microscopy (HRTEM) results demonstrated that the nanotubes were densely coated with a PP layer. Infrared spectroscopy (IR) results revealed that there was covalently linkage of MWNTs with PP via MAH. The interactions between MWNTs-PP and MWNTs-PBMA induced orientation of MWNTs. The improved mechanical properties of PP - coated MWNTs composite was also shown. © (2013) Trans Tech Publications, Switzerland. Source

Wang C.-R.,Hunan University of Technology | Zeng B.,Hunan University of Technology | Zeng B.,University of Science and Arts of Iran | Chen X.-H.,Hunan University of Technology | And 5 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

The electrostatic self-assembly method was used to synthesize the carbon nanotube-graphene/cuprous oxide (CNTs-rGO/Cu2O) composite spheres. The morphology and phase composition were characterized by scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffractometry (XRD). The effects of stirring rate, microwave power and CNTs content on the composite spheres morphology were investigated. The photo catalytic property was studied. The results show that the CNTs-graphene hybrids are embedded in the composite particle in a specific network form. The synthesis conditions that have a significant effect on the photocatalytic performance of CNTs/rGO-CuO, such as stirring speed, microwave power and CNTs-GO content were discussed. The size of these spheres is largely influenced by CNT-GO content. The addition of GO greatly enhance the dispersion performance of CNTs. The composite spheres could be an excellent candidate as powders for the fabrication of a bulk MWCNT-reinforced copper composite. And when the carbon nanotubes/graphene oxide content is 2% and microwave power is 525 W, the composite spheres prepared show the best catalytic effect. ©, 2015, Central South University of Technology. All right reserved. Source

Deng W.,Hunan University of Technology | Chen X.,Hunan University of Technology | Liu Z.,Hunan University of Technology | Zeng Y.,Hunan University of Technology | And 4 more authors.
Nanotechnology | Year: 2014

Nitrogen-doped carbon nanotubes (NCNTs) were prepared using a simple ultrasonic spray pyrolysis method. The precursor concentration effect was examined to effectively control alignment, open tip and diameter of the NCNTs by changing xylene/cyclohexylamine ratio. The structure and morphology of the resultant NCNTs were characterized by scanning electron microscopy, transmission electron microscopy and x-ray photoelectron spectroscopy. The degree of alignment and the diameter of the NCNTs increased as the xylene/cyclohexylamine precursor mixture was changed from 0 to 35% cyclohexylamine. This precursor composition also caused a large number of open-ended nanotubes to form with graphite layers inside the cavities of the NCNTs. However, further increase cyclohexylamine content in the precursor reduced the degree of alignment and diameter of the NCNTs. We demonstrate control over the NCNT alignment and diameter, along with the formation of open-ended nanotube tips, and propose a growth mechanism to understand how these properties are interlinked. © 2014 IOP Publishing Ltd. Source

Xiong Y.,Hunan University | Xiong Y.,Changsha Aeronautical Vocational Technical College | Chen X.,Hunan University | Yang Z.,Hunan University | Xu L.,Xiamen University of Technology
Advanced Materials Research | Year: 2012

Carbon nanobelts(CNBs) with high purities (over 90%) have been successfully synthesized by catalytic decomposition of CH4 over Mo/Fe/MgO catalysts at 1173 K. The CNBs have thickness of about 8.0nm, width of about 50-200nm.with few defects and amorphous. It has been found that the addition of component Mo in catalysts plays a key role to synthesize the carbon nanobelts at high yields. The graphitic sheets increased with the increase of Mo content in catalysts. © (2012) Trans Tech Publications. Source

Deng W.,Hunan University of Technology | Chen X.,Hunan University of Technology | Liu Z.,Hunan University of Technology | Hu A.,Hunan University of Technology | And 3 more authors.
Journal of Power Sources | Year: 2015

Three-dimensional (3D) structure-based tin disulfide/vertically aligned carbon nanotube arrays (VACNTs) composites have been successfully fabricated via a facile hydrothermal method for self-assembly with the help of nebulization-assisted infiltration. The SnS2 particles are anchored on the surface of the VACNTs and the number of these nanoparticles increases as the nebulization time increase. The novel 3D structure-based SnS2/VACNTs sample with the SnS2 content of 67 wt% exhibits excellent electrochemical performance, including high capacity (738 mA h g-1 at 50 mA g-1 after 1st cycle), good cycle stability (551 mA h g-1 at 100 mA g-1 after 100 cycles), and excellent rate capability (223 mA h g-1 at 2000 mA g-1) when used as an anode in lithium ion batteries. The high electrochemical performance can be attributed to the synergistic effect of SnS2 and the unique microstructure of VACNTs, which provide the rapid pathways for ionic and electronic transport ascribing to their well-directed 1D conductive electron paths and well defined regular pore structures. The VACNTs serve as not only conductive additives to improve the conductivity of SnS2 in the composites, but also as buffer matrix to restrain the volume change of SnS2 and stabilize the electrode structure during the alloying/dealloying process. © 2014 Elsevier B.V. All rights reserved. Source

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