Synthesis, characterization and microwave absorption of carbon-coated Sn nanorods

Wang, Z.H.; Han, Zheng; Geng, D. Y.; Zhang, Z.D.

doi:10.1016/j.cplett.2010.02.056

Cited by 65 publications

(25 citation statements)

References 32 publications

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“…To obtain the EM-absorption properties of carboncoated Cu nanocapsules, RL of the Cu nanocapsules was calculated using the relative complex permeability and permittivity at a given frequency and layer thickness according to the transmission-line theory 3,22 . Figure 2 represents the frequency dependence of the complex relative permittivity (e r ) and permeability (m r ) of the paraffin-Cu nanocapsules composite.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, from the HRTEM of Figure 1c, it is clearly noted that the whole surface of the nanoparticles is coated by a graphitic multi-layered carbon shell around 1-2 nm in thickness, which is thinner than that of carbon-coated Fe, Ni or Sn nanocapsules 3,10 . The interplaner spacing of 0.34 nm in the coating is approximately close to that of the bulk graphite (002) plane, which is accordance with the previous results 2, 3,10 . Moreover, it can be found that many lattice defects occur in the carbon shell, including collapses, unevenness, dislocations, etc.…”

Section: Methodsmentioning

confidence: 99%

“…Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) images were obtained on a JEOL JEM-2010 transmission electron microscope at an acceleration voltage of 200 kV. The paraffin-Cu nanocapsules composite was prepared by uniformly mixing Cu nanocapsules with paraffin, as described in detail elsewhere [2][3][4][5][6][7][8][9][10][16][17][18][19][20] , by homogeneously mixing the nanocapsule with paraffin and pressing them into cylindershaped compacts. Then the compact was cut into toroidal shape with 7.00 mm outer diameter and 3.04 mm inner diameter.…”

Section: Methodsmentioning

confidence: 99%

“…In recent decades, much attention has been paid to carbon-coated metal nanoparticles, namely 'nanocapsules'. In recent years, with the development of local electronic devices, microwave communication, and the rising pollution of electromagnetic (EM) interference, materials with EM-wave absorption in a wide frequency range, with strong absorption, low density, and low cost are more and more desirable 3 . The EM-wave absorption properties of magnetic material-based nanocomposites and heterostructured nanocomposites have been intensely investigated, because of the synergetic effect between magnetic and dielectric losses [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Sun

Liu

et al. 2014

Mat. Res.

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The microstructure and microwave absorption of carbon-coated Cu nanocapsules have been investigated. Carbon-coated Cu nanocapsules have been synthesized by an arc-discharge method. The paraffin-Cu/C nanocapsules composite shows excellent electromagnetic (EM) absorption properties. An optimal reflection loss (RL) value of -40.0 dB is reached at 10.52 GHz for a layer 1.9 mm thickness. RL exceeding -20 dB can be realized in any interval within the 1-18 GHz range by choosing an appropriate thickness of the absorbent layer between 1.1 and 10.0 mm. Theoretical simulation for the microwave absorption using the transmission line theory agrees reasonably well with the experimental results. The EM-wave absorption properties of nanocapsules materials are illustrated by means of an absorption-tube-map. The carbon-coated Cu nanocapsule is an attractive candidate for EM-wave absorption, which significantly enriches the family of EM-wave nanoabsorbents.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Sun

Liu

et al. 2014

Mat. Res.

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“…One peak may result from the relaxation loss of permanent electric dipoles due to defects in the amorphous carbon shell demonstrated by the TEM image in Figure 2b. The other peaks can be explained on the basis of space charge polarization model of Wagner 21 and Maxwell 20 According to space charge polarization model, the increase of ' ε of complex permittivity at higher frequencies can be attributed to the interfacial space-charge polarization which arises from the heterogeneous mixtures. Interfacial polarization is always present in heterogeneous mixtures including more than one phase like the FCC-Co/C-paraffin composites.…”

Section: Microwave Absorbing Properties Of Fcc-co/c Nanocapsulesmentioning

confidence: 99%

Large Scale Synthesis of Superparamagnetic Face-centered Cubic Co/C Nanocapsules by a Facile Hydrothermal Method and their Microwave Absorbing Properties

Liu

Zhou

et al. 2015

Mat. Res.

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A large scale direct hydrothermal method has been used to prepare face-centered cubic (FCC) Co/C nanocapsules with a core of FCC-Co nanoparticles and a shell of amorphous C. The size distribution is 5-20 nm. The T B of FCC-Co/C nanocapsules is determined as 85 K, indicating that FCC-Co/C nanocapsules are superparamagnetic at 300 K. For FCC-Co/C nanocapsules-paraffin composite, an optimal reflection losbs (RL) of -33.4 dB is observed at 9.6 GHz for the 2.6 mm thick layer. RL values exceeding -20 dB in the 7.4 -15 GHz range are obtained by choosing an appropriate absorption-layer thickness between 1.7 and 3.3 mm. The good microwave absorbing properties of FCC-Co/C nanocapsules is considered to result from the excellent synergetic effect of the multi-dielectric relaxation loss and the multi-magnetic resonance loss. Quantitative calculation demonstrated that not only RL peak position but also the number of the peaks are determined by the quarter-wavelength cancellation model.

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Study of carbonization behavior of polyacrylonitrile/tin salt as anode material for lithium‐ion batteries

Wang

Xiu

Zhang

et al. 2016

J of Applied Polymer Sci

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Using polyacrylonitrile (PAN) as a template, a composite of tin salt/PAN nanofiber is facilely produced by an electrospinning technique. Under high‐temperature heat treatment, the carbonization of PAN and the crystal growth of tin oxide proceed simultaneously to form a composite structure of tin nanoparticles wrapped in carbon nanofibers (tin@CNF). The composite structure of tin@CNF is controllable by the precursor ratio of PAN with tin salt and the carbonization temperature. The sample Sn1Pan1_700, synthesized from the precursor with weight ratio of SnCl2:PAN = 1:1 and carbonized at 700 °C, delivers the initial capacity of 1329.8 mAh g−1 and remains at 741.1 mAh g−1 at the 40th cycle. The proper morphology of tin nanoparticles wrapped in carbon nanofibers plays an important role in specific capacity and cyclic performance, because the proper structure of carbon fiber hinders the aggregation of tin nanoparticles during the lithiation and delithiation processes. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016

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Synthesis, characterization and microwave absorption of carbon-coated Sn nanorods

Cited by 65 publications

References 32 publications

Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Large Scale Synthesis of Superparamagnetic Face-centered Cubic Co/C Nanocapsules by a Facile Hydrothermal Method and their Microwave Absorbing Properties

Study of carbonization behavior of polyacrylonitrile/tin salt as anode material for lithium‐ion batteries

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