Controllable synthesis of Ni/NiO@porous carbon hybrid composites towards remarkable electromagnetic wave absorption and wide absorption bandwidth

Zhou, Xinfeng; Jia, Zirui; Zhang, Xingxue; Wang, Bingbing; Wu, Wei; Liu, Xuehua; Xu, Binghui; Wu, Guanglei

doi:10.1016/j.jmst.2021.01.073

Cited by 191 publications

(22 citation statements)

References 53 publications

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“…Besides, the lattice spacing of 0.204 nm (Fig. 3c-1) matches (111) plane of the NiCo alloy, which also confirms the formation of NiCo alloy [46,47]. The diffraction rings in Fig.…”

Section: Composition and Structuresupporting

confidence: 59%

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

et al. 2021

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Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still a problem that obtaining excellent EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites. Finally, with the synergy of excellent dielectric loss and magnetic loss, an outstanding absorption performance could be achieved with the reflection loss of − 60.97 dB at the matching thickness of 2.3 mm, and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm. Moreover, this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.

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“…Besides, the lattice spacing of 0.204 nm (Fig. 3c-1) matches (111) plane of the NiCo alloy, which also confirms the formation of NiCo alloy [46,47]. The diffraction rings in Fig.…”

Section: Composition and Structuresupporting

confidence: 59%

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

et al. 2021

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“…To further investigate and confirm the polarization relaxation loss of these three absorbers, the ε′ – ε″/ f plots were also curved. According to the Debye theory and its derived formula (ε′ = ε″/2πτ f + ε ∞ ), the relationship of ε′ – ε″/ f will be a linear function if the dielectric loss is related to a polarization relaxation. , As demonstrated in Figure f, the typical linear curve reveals the implying presence of dielectric polarization relaxations. As such, the MoS 2 nanoarchitecture construction toward Fe 3 O 4 @NC could further enrich the interfacial polarization of absorbers.…”

Section: Resultsmentioning

confidence: 99%

“…Electromagnetic wave (EMW) absorbers are the functional materials that can dissipate EMWs by converting them into thermal energy. − Nowadays, with the wide usage of a broadened frequency band in smart technologies in daily life (such as mobile terminal, cellular telephone, and man–machine interaction), the resulting EMW radiation pollution is becoming a considerable concern toward electronic communication, information security, and human health. ,− Consequently, pursuing the EMW absorbers with high efficiency and a wide absorption frequency range is of vital significance for solving the increasing menace of EMW pollution. Actually, the EMW protection is an old topic and can be traced back to the antiradar stealthy purpose in military applications. ,, In general, the EMW attenuation performance of EMW absorbers depend on their composition, size, and morphology. − Among the various EMW absorbers, the magnetic nanomaterials have been the hot spots of increasing interest because of their physical properties and potential technological applications. , …”

Section: Introductionmentioning

confidence: 99%

Dumbbell-Like Fe₃O₄@N-Doped Carbon@2H/1T-MoS₂ with Tailored Magnetic and Dielectric Loss for Efficient Microwave Absorbing

Ning

Lei

Tan

et al. 2021

ACS Appl. Mater. Interfaces

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Ferroferric oxide (Fe3O4)/C composites have received much attention as a result of converting electromagnetic waves to heat for harvesting efficient electromagnetic wave (EMW) absorbing performance. However, the practical EMW absorbing of these absorbers is still greatly hindered by the unmatched impedance properties and limited EMW absorbing ability. Tuning the morphologies at nanoscale and assembling the nanoarchitecture construction are essential to address this issue. Herein, dumbbell-like Fe3O4@N-doped carbon (NC)@2H/1T-MoS2 yolk–shell nanostructures are rationally designed and fabricated via a facile etching and wet chemical synthesis strategy. By manipulating the etching time toward the magnetic Fe3O4 component, the dielectric and magnetic loss of absorbers could be well-tuned, thus achieving the optimized impedance characteristics. As a result, the maximum refection losses (RLmaxs) of Fe3O4@NC-9h and Fe3O4@NC-15h are −19.8 dB@7.9 GHz and −39.5 dB@8.3 GHz, respectively. Moreover, the MoS2 nanosheets with a mixed 2H/1T phase anchored on Fe3O4@NC-15h (Fe3O4@NC-15h@MoS2) further boost the RLmax to −68.9 dB@5.8 GHz with an effective absorbing bandwidth of ∼5.25 GHz. The tailored synergistic effect between dielectric and magnetic loss and the introduced interfacial polarization (Fe3O4@NC/MoS2) are discussed to explain the drastically enhanced microwave absorbing ability. This work opens up new possibilities for effective manipulation of electromagnetic wave attenuation performance in magnetic–dielectric-type nanostructures.

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“…To measure the degree of crystallinity, the ratio of the areas of the crystalline peaks to the areas under the scattering curve must be calculated. 52 From the XRD spectrum, it is observed that the crystallinity degree of PVDF was increased from 40.73% to 54.71% by incorporation of 15% (w/w) BaTiO 3 nanoparticles into the hybrid structure. Additionally, the high intense peak was found to be close to the β-crystalline phase position of PVDF.…”

Section: Smentioning

confidence: 99%

Hybrid fibrous (PVDF-BaTiO₃)/ PA-11 piezoelectric patch as an energy harvester for pacemakers

Mashayekhan

Kabir

Kamalidehghan

et al. 2022

Journal of Industrial Textiles

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Lithium batteries have been widely used to power up implantable medical devices such as pacemakers that are often designed to treat, diagnose, and prevent different diseases. However, due to their limited capacity and lifetime, patients have to undergo a surgical procedure to replace the discharged battery. Recently, nanogenerators have been emerged and are broadly accepted since they can convert tiny biomechanical forces, such as heartbeats, into electrical energy. This study aims to manufacture a biocompatible and high-performance piezoelectric energy harvester (PEH) that is capable to be charged by the energy received from the heartbeat and store the generated voltage. In this research, a hybrid structure of poly (vinylidene fluoride) (PVDF) coupling with polyamide-11 (PA-11) was fabricated using dual electrospinning to enhance the piezoelectric properties of the intended PEH. The piezoelectric test results show an acceptable increase in nanofibers’ piezoelectric sensitivity from 62.87 mV/N to 75.75 mV/N by adding 25% (v/v) of PA-11 to PVDF, indicating the synergistic effect of PVDF and PA-11. The specimen PVDF (75% v/v)-PA-11 (25% v/v) also showed the highest mechanical strength and consequently is suggested as the optimum sample. To further enhance the efficacy and sensitivity of PEH to convert the small mechanical forces into an acceptable voltage, 15% (w/w) of barium titanate (BaTiO3) nanoparticles were added to the hybrid structure. The crystallinity and mechanical strength were noticeably increased by incorporating BaTiO3 nanoparticles into the fibrous structure, leading to a piezoelectric sensitivity of 107.52 mV/N. This result lays the groundwork for producing an effective piezoelectric patch that could be used as pacemaker batteries.

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Controllable synthesis of Ni/NiO@porous carbon hybrid composites towards remarkable electromagnetic wave absorption and wide absorption bandwidth

Cited by 191 publications

References 53 publications

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Dumbbell-Like Fe₃O₄@N-Doped Carbon@2H/1T-MoS₂ with Tailored Magnetic and Dielectric Loss for Efficient Microwave Absorbing

Hybrid fibrous (PVDF-BaTiO₃)/ PA-11 piezoelectric patch as an energy harvester for pacemakers

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Controllable synthesis of Ni/NiO@porous carbon hybrid composites towards remarkable electromagnetic wave absorption and wide absorption bandwidth

Cited by 191 publications

References 53 publications

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Dumbbell-Like Fe3O4@N-Doped Carbon@2H/1T-MoS2 with Tailored Magnetic and Dielectric Loss for Efficient Microwave Absorbing

Hybrid fibrous (PVDF-BaTiO3)/ PA-11 piezoelectric patch as an energy harvester for pacemakers

Contact Info

Product

Resources

About

Dumbbell-Like Fe₃O₄@N-Doped Carbon@2H/1T-MoS₂ with Tailored Magnetic and Dielectric Loss for Efficient Microwave Absorbing

Hybrid fibrous (PVDF-BaTiO₃)/ PA-11 piezoelectric patch as an energy harvester for pacemakers