Author
Renchao Che
Other affiliations: Peking University
Bio: Renchao Che is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Carbon nanotube & Carbon. The author has an hindex of 4, co-authored 6 publications receiving 1496 citations. Previous affiliations of Renchao Che include Peking University.
Papers
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TL;DR: In this paper, the absorption properties of CNT/crystalline Fe nanocomposites have been investigated and it was shown that the absorption property is due to the confinement of crystalline Fe in carbon nanoshells, deriving mainly from magnetic rather than electric effects.
Abstract: CNT/crystalline Fe nanocomposites (see Figure) have excellent microwave-absorption characteristics. This absorption property is shown to result from the confinement of crystalline Fe in carbon nanoshells, deriving mainly from magnetic rather than electric effects-the complex permittivity and permeability depend both on the shape and phase of the CNT/Fe nanocapsulates.
1,780 citations
TL;DR: In this article, a possible growth mechanism of the Fe-filled nantotubes was proposed based on the experimental results, and a high-resolution transmission electron microscopy (HRTEM) and electronic energy loss spectrum (EELS) of the filled nanotubes confirmed the presence of Fe inside the Nanotubes.
43 citations
Patent•
12 Mar 2003
TL;DR: In this article, a composite carbon nanotube/ferromagnetic metal nanowire material is composed of carbon and ferromagentic nanowires filled in said nanotubes.
Abstract: A composite carbon nanotube/ferromagnetic metal nanowire material is composed of carbon nanotubes and ferromagentic metal nanowires filled in said nanotubes, and is prepared through growing carbon nanotubes while filling said nanowires in the nanotubes, and crystallizing said nanowires. If said material is dispersed in the epoxy resin/alcohol solution and then solidified, a microwave absorption material or an electromagnetic shielding material is obtained.
12 citations
TL;DR: In this article, the shape and the phase of the carbon nanocapsulate may be controlled during the growth, and controlled ferrous amorphous-crystalline phase transformation may be realized via electron beam irradiation.
11 citations
Patent•
10 Dec 2003
TL;DR: In this paper, a new structure of carbon base nano tube is described, which is characterized by the interior of the nano tube being filled up with metal or metal oxide granules, the described granules can be used to make the external wall of the described nano tube form several geometrical projections.
Abstract: The present invention relates to a new structure of carbon base nano tube, and is characterized by that the interior of the nano tube is filled up with metal or metal oxide granules, the described granules can be used to make the external wall of the described carbon base nano tube form several geometrical projections. The invention also provides its preparation method for obtaining carbon base nano tube with new structure, and the invented nano tube can increase field emission efficiency of material in several times over, can reduce open electric field and raise emission current density, andcan be used as field emission cathode.
4 citations
Cited by
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TL;DR: In this paper, a dielectric spectroscopy of short carbon fiber/silica composite in the frequency range from 8.2 to 12.4 GHz at temperatures between 30 and 600°C has been performed.
1,540 citations
TL;DR: The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated and it is shown that via physical compression, the microwave absorption performance can be tuned.
Abstract: The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated. Simply via physical compression, the microwave absorption performance can be tuned. The qualified bandwidth coverage of 93.8% (60.5 GHz/64.5 GHz) is achieved for the GF under 90% compressive strain (1.0 mm thickness). This mainly because of the 3D conductive network.
1,533 citations
TL;DR: Owing to the magnetic-dielectric synergistic effect, the obtained CoNi@SiO2 @TiO2 microspheres exhibit outstanding microwave absorption performance with a maximum reflection loss of -58.2 dB and wide bandwidth of 8.1 GHz.
Abstract: The synthesis of CoNi@SiO2 @TiO2 core-shell and CoNi@Air@TiO2 yolk-shell microspheres is reported for the first time. Owing to the magnetic-dielectric synergistic effect, the obtained CoNi@SiO2 @TiO2 microspheres exhibit outstanding microwave absorption performance with a maximum reflection loss of -58.2 dB and wide bandwidth of 8.1 GHz (8.0-16.1 GHz, < -10 dB).
1,409 citations
TL;DR: Chemical graphitized r-GOs, as the thinnest and lightest material in the carbon family, exhibit high-efficiency electromagnetic interference shielding at elevated temperature, attributed to the cooperation of dipole polarization and hopping conductivity.
Abstract: Chemical graphitized r-GOs, as the thinnest and lightest material in the carbon family, exhibit high-efficiency electromagnetic interference (EMI) shielding at elevated temperature, attributed to the cooperation of dipole polarization and hopping conductivity. The r-GO composites show different temperature-dependent imaginary permittivities and EMI shielding performances with changing mass ratio.
1,358 citations
TL;DR: The results indicate that single-walled carbon nanotube-polymer composites can be used as effective lightweight EMI shielding materials and are found to correlate with the dc conductivity.
Abstract: Single-walled carbon nanotube (SWNT)−polymer composites have been fabricated to evaluate the electromagnetic interference (EMI) shielding effectiveness (SE) of SWNTs. Our results indicate that SWNTs can be used as effective lightweight EMI shielding materials. Composites with greater than 20 dB shielding efficiency were obtained easily. EMI SE was tested in the frequency range of 10 MHz to 1.5 GHz, and the highest EMI shielding efficiency (SE) was obtained for 15 wt % SWNT, reaching 49 dB at 10 MHz and exhibiting 15−20 dB in the 500 MHz to 1.5 GHz range. The EMI SE was found to correlate with the dc conductivity, and this frequency range is found to be dominated by reflection. The effects of SWNT wall defects and aspect ratio on the EMI SE were also studied.
1,148 citations