Self-Supported Construction of Three-Dimensional MoS<sub>2</sub> Hierarchical Nanospheres with Tunable High-Performance Microwave Absorption in Broadband

Zhang, Xiaojuan; Li, Sheng; Wang, Shan-Wen; Yin, Zongjie; Zhu, Jia-Qiang; Guo, Aoping; Wang, Guang-Sheng; Yin, Penggang; Guo, Lin

doi:10.1021/acs.jpcc.6b06661

Cited by 167 publications

(78 citation statements)

References 51 publications

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“…Supporting Information Figure S2(a,b) exposes reflection losses with various thicknesses and simulation of matching thicknesses, respectively, for the g‐C 3 N 4 /PMMA, CuS/PMMA, and g‐C 3 N 4 /CuS/PMMA nanocomposites along the X‐ and ku‐band frequency. The results exhibit that the maximum reflection loss was blue shifted when the absorber thickness was diminished, correlated by the quarter wavelength mechanism calculated by

t_{m} = \frac{nc}{4 \sqrt{(||, {normalε}_{r}) (||, {normalμ}_{r})} f_{m}}

equation where n , t m , and f m are the odd number, matching thickness, and frequency . According to this theory, when the thickness of the microwave‐absorbing sample was an odd numeral coefficient of λ/4 of the incident waves, the reflected waves of the interfaces having 180° out of phase with the input waves act as destroyer reversal waves .…”

Section: Resultsmentioning

confidence: 67%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

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In this study, a broadband, intense, novel, and promising microwave-absorbing nanocomposite was prepared using graphite-like carbon nitride (g-C 3 N 4 )/CuS suspended in poly(methyl methacrylate) (PMMA) medium. The g-C 3 N 4 nanosheets were synthesized by heating the urea as well as the CuS nanoparticles, and g-C 3 N 4 /CuS nanocomposites were prepared using a solvothermal method and then were separately molded by a PMMA solution to investigate their microwave-absorbing characteristics. The Fourier transform infrared and X-ray powder diffraction were used to characterize the g-C 3 N 4 , CuS, and CuS/g-C 3 N 4 nanostructures, which confirmed that the pure structure of the nanomaterials has been synthesized. The optical properties of the nanostructures were also investigated by diffuse reflection spectroscopy analysis. Accordingly, the Kubelka-Munk theory suggested significant narrow band gap for g-C 3 N 4 /CuS nanocomposite (0.27 eV), facilitating electron jumping and conductive loss. The morphology of the structures was examined using field emission scanning electron microscopy micrographs, illustrating that the uniform hexagonal structures of the CuS nanoplates have been formed and the CuS two-dimensional structures were uniformly distributed on the g-C 3 N 4 nanosheets. Finally, the microwave-absorbing properties of the CuS, g-C 3 N 4 , and g-C 3 N 4 /CuS were investigated by PMMA as a host. The microwaveabsorbing properties were evaluated using a vector network analyzer. The results illustrated that the maximum reflection loss of the g-C 3 N 4 /PMMA nanocomposite was −71.05 dB at 14.90 GHz with a thickness of 2.00 mm, demonstrating a 1.70 GHz bandwidth >30 dB, as well as g-C 3 N 4 /CuS/PMMA nanocomposite absorbed 7.30 GHz bandwidth of more than 10 dB with a thickness of 1.80 mm along the x-and ku-band frequency. The obtained results introduced the PMMA as a capable microwave-absorbing substrate. Besides, the g-C 3 N 4 /CuS/PMMA nanocomposite demonstrated metamaterial property and abundant attenuation constant.

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t_{m} = \frac{nc}{4 \sqrt{(||, {normalε}_{r}) (||, {normalμ}_{r})} f_{m}}

Section: Resultsmentioning

confidence: 67%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

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“…As shown by the spectra, the maximum reflection loss of microwave absorption was shifted to the higher frequency when the absorber thickness was diminished. This was confirmed by the match frequency

f_{normalm} \sqrt{true| μ_{normalr} true| true| ϵ_{normalr} true|} = \frac{nc}{4 t_{normalm}}

equation where t m and f m are the matching thickness and frequency, known as quarter wave length mechanism …”

Section: Resultsmentioning

confidence: 75%

“…The spectra illustrated more resonance peaks within the PVDF polymeric matrix, originated from dipole interactions between the fluorine unpaired electrons and the surface of nanoparticles. The high electronegativity of fluorine led to the enhancement of unsaturated states and various polarization relaxation times on the surface of nanoparticles, desirable for the microwave attenuation defined by Debye relaxation theory . More unsaturated states leading to the more electrons hopping are desirable for the Maxwell–Wagner effect and microwave absorption properties .…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Copper Chromium Oxide Nanoparticles Using Modified Sol‐Gel Route and Evaluation of Their Microwave Absorption Properties

Peymanfar

Khodamoradipoor²

2019

Physica Status Solidi (a)

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In this study, simple, broadband, robust, and affordable microwave absorbing nanocomposites are prepared using CuCr2O4 nanoparticles as guests and silicone rubber or poly(vinylidene fluoride) (PVDF) as host. Firstly, the pristine and modified CuCr2O4 nanoparticles are obtained by the conventional citrate gel method in the absence and presence of sucrose as a novel capping agent in the experimental steps. X‐ray powder diffraction (XRD) patterns confirms that the CuCr2O4 nanoparticles are synthesized. Moreover, morphologies, chemical functional groups, and optical properties are studied using field emission scanning electron microscopy (FE‐SEM), Fourier transform infrared (FT‐IR), and diffuse reflection spectroscopy (DRS), respectively. The vibrating sample magnetometer (VSM) analysis reveals weak magnetic properties for the nanoparticles and confirms that the capping agent change the magnetic properties. Finally, bare and modified copper chromium oxide nanoparticles are separately molded with silicone rubber or PVDF to compare dipole and interfacial polarization. Besides, using a vector network analyzer (VNA) along the x and ku‐band frequency, novel organic precursor effects on their microwave absorption properties are examined. According to the obtained results, the maximum reflection loss of the modified CuCr2O4/PVDF is −65.57 dB at 14 GHz with 2 mm thickness and the CuCr2O4/PVDF nanocomposite absorbs a bandwidth of 7.73 GHz more than 10 dB with a thickness of 2 mm. Interestingly, novel one type filler lead to significant microwave absorbing properties as well as organic capping agent reinforced maximum microwave absorption also PVDF improves absorption bandwidth.

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“…studied a self‐supported construction of three‐dimensional MoS 2 hierarchical nanospheres. This spherical MoS 2 also has good electromagnetic wave absorption performance that the reflection loss can reach −26.11 dB at a thickness of 2.5 mm when the loading amount is 25 wt % . A number of studies have shown that the study of MoS 2 , a material with high dielectric properties, is the right direction.…”

Section: Introductionmentioning

confidence: 97%

Controllable Synthesis of One‐Dimensional MoO₃/MoS₂ Hybrid Composites with their Enhanced Efficient Electromagnetic Wave Absorption Properties

Shen

Ding

et al. 2019

ChemPlusChem

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One‐dimensional MoO3/MoS2 hybrid composites were synthesized by hydrothermal synthesis, and flexible MoO3/MoS2/PVDF nanocomposites could be prepared in a controlled fashion by combining the MoO3/MoS2 composites with polyvinylidene fluoride (PVDF) matrix. The MoO3/MoS2/PVDF hybrids with a low filler content (20 wt %) exhibited distinct microwave absorption properties in the range of 2–18 GHz. The minimum reflection loss can reach −38.5 dB at 8.7 GHz, and the reflection loss was less than −10 dB in the frequency range from 3.03–11.02 GHz with an absorber thickness of 2.0–5.0 mm. The MoO3/MoS2/PVDF nanocomposites exhibited better absorption properties than pure MoO3 and MoS2. The possible microwave absorption mechanism was also discussed in detail.

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Self-Supported Construction of Three-Dimensional MoS₂ Hierarchical Nanospheres with Tunable High-Performance Microwave Absorption in Broadband

Cited by 167 publications

References 51 publications

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Preparation and Characterization of Copper Chromium Oxide Nanoparticles Using Modified Sol‐Gel Route and Evaluation of Their Microwave Absorption Properties

Controllable Synthesis of One‐Dimensional MoO₃/MoS₂ Hybrid Composites with their Enhanced Efficient Electromagnetic Wave Absorption Properties

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Self-Supported Construction of Three-Dimensional MoS2 Hierarchical Nanospheres with Tunable High-Performance Microwave Absorption in Broadband

Cited by 167 publications

References 51 publications

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Preparation and Characterization of Copper Chromium Oxide Nanoparticles Using Modified Sol‐Gel Route and Evaluation of Their Microwave Absorption Properties

Controllable Synthesis of One‐Dimensional MoO3/MoS2 Hybrid Composites with their Enhanced Efficient Electromagnetic Wave Absorption Properties

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Product

Resources

About

Self-Supported Construction of Three-Dimensional MoS₂ Hierarchical Nanospheres with Tunable High-Performance Microwave Absorption in Broadband

Controllable Synthesis of One‐Dimensional MoO₃/MoS₂ Hybrid Composites with their Enhanced Efficient Electromagnetic Wave Absorption Properties