Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO<sub>2</sub>nanocrystals

Li, Gang; Xing, Honglong; Shu, Ruiwen; Wang, Lei; Ji, Xiaoli; Tan, Dexin; Gan, Ying

doi:10.1039/c5ra17303e

Cited by 70 publications

(23 citation statements)

References 46 publications

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“…The Sn peaks loaded at 487.5 and 495.9 eV (Figure e) can be assigned to Sn 3d 5/2 and Sn 3d 3/2 , respectively, with an energy gap of 8.4 eV. The spin–orbit splitting can be ascribed to the existence of Sn ions in the ZnSnO 3 lattice . In terms of the chemical valence state of the O element, the O 1s peaks at 531.0, 531.6, and 532.8 eV can be ascribed to the Zn–O or O–Sn–O group (Figure f).…”

Section: Results and Discussionmentioning

confidence: 96%

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

Wang

Xiao

et al. 2018

ACS Appl. Mater. Interfaces

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165

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Polarization and conduction loss play fundamentally important roles in the nonmagnetic microwave absorption process. In this paper, a uniform and monodisperse hollow ZnSnO cube wrapped by multiwalled carbon nanotubes (ZSO@CNTs) was successfully synthesized via facile hydrothermal treatment. A reasonable mechanism related to Ostwald ripening was proposed to design the varied ZSO@CNTs for the special hollow conductive network. Scanning electron microscopy images clearly indicate that reaction temperature is the key factor for the composite structure, which has a significant effect on its electromagnetic properties. Electron holography proves the inhomogeneous distribution of charge density in the ZSO@CNT system, leading to the occurrence of interface polarization. Complex permittivity properties of ZSO@CNT composites under different reaction temperatures were investigated to optimize the morphology that can distinctly enhance microwave absorption performance. The maximum reflection loss that the ZSO@CNT-130 °C composite can reach is -52.1 dB at 13.5 GHz, and the absorption bandwidths range from 11.9 to 15.8 GHz with a thickness as thin as 1.6 mm. Adjusting the simulation thicknesses from 1 to 5 mm, the efficient absorption bandwidth (RL < -10 dB) that the ZSO@CNT composite could reach was 14.16 GHz (88.8% of 2-18 GHz). The excellent microwave absorption performance may be attributed to the synergistic effects of polarization, conduction loss, and special hollow cage structure. It is proposed that the specially controlled structure could provide an effective path for achieving a high-performance microwave absorber.

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Section: Results and Discussionmentioning

confidence: 96%

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

Wang

Xiao

et al. 2018

ACS Appl. Mater. Interfaces

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165

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“…The effect of Debye dipolar relaxation and natural resonance are regarded as the major parameters for dielectric interactions. Debye dipolar relaxation appears as Cole–Cole semicircles in permittivity analysis, which can be expressed by the following equations where ε s is the static permittivity, ε ∞ is relative dielectric permittivity in high frequency, f is the microwave frequency, and τ is the polarization relaxation time. Thus, ε′ and ε″ can be expressed as follows …”

Section: Resultsmentioning

confidence: 99%

ZnO Nanorod-Based Microflowers Decorated with Fe₃O₄ Nanoparticles for Electromagnetic Wave Absorption

Yang

Wang

2020

ACS Appl. Nano Mater.

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It is of great significance to improve the electromagnetic wave absorption performance of absorbing materials for application in critical fields using different techniques to design a unique structure. Three-dimensional (3D) ZnO nanorods with unique microflower-like structures and high-performance microwave absorption were successfully synthesized via the hydrothermal route and annealing process, which were modified with sphere-like Fe 3 O 4 nanoparticles. The composites display an outstanding microwave absorption property with different contents of Fe 3 O 4 nanoparticles and the mass ratio of ZnO/Fe 3 O 4 to paraffin is 3:2. The best reflection loss (RL) value can reach −36.2 dB at 9.35 GHz with an absorber thickness of only 2.7 mm and the corresponding absorption bandwidth is 4.02 GHz (6.81−10.83 GHz) in the range of 2−18 GHz when the composites contain 11.3 wt % Fe 3 O 4 as the filler. A mechanism is proposed and discussed to further understand the absorption behavior of composites. This work demonstrates a promising synthetic route to design thin, economical, and wide-bandwidth stable microwave-absorbing materials with outstanding microwave absorption performance.

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“…Up to now, the applications of bare SnO 2 QDs and their modified ones mainly focus on the above discussed lithium-ion batteries, photocatalysis and gas sensors domains. However, researchers have also explored their applications in some other domains, such as fast adsorption of methylene blue (MB) [121], nano light emitting [125], microwave absorbing [147] and resonance imaging [148]. Dutta et al [121] have loaded the SnO 2 QDs with size of 3 nm on mesoporous SiO 2 nanoparticles (MSN) and investigated their adsorption performances of MB.…”

Section: Applications In Some Other Domainsmentioning

confidence: 99%

Highlights on advances in SnO₂ quantum dots: insights into synthesis strategies, modifications and applications

Chen

Huang

et al. 2018

Materials Research Letters

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The applications of SnO 2 are benefited from its nanostructure with different sizes and novel morphologies. When the size of nanoparticles reduces to 1-10 nm, the unique physical and chemical properties will make prominent. SnO 2 quantum dots (QDs), a type of zero-dimensional ultrasmall SnO 2 nanomaterials with a size in 1-10 nm, have displayed unique physical and chemical properties, which are different from those of their larger-sized ones. This review summarizes various synthesis strategies of SnO 2 QDs and the methods of their modifications, discusses their applications in lithium-ion batteries, photocatalysis, and gas sensors. These applications profit from the characteristic properties inherent in SnO 2 QDs. IMPACT STATEMENT This paper provides a comprehensive understanding for fabricating SnO 2 quantum dots and their modifications via various methods for the applications in lithium-ion batteries, photocatalytic degradations, and solid-state gas sensors.

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Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO₂nanocrystals

Abstract: Ni-doped SnO2@MWCNTs composites were synthesized by a facile one-step hydrothermal method, and had a maximum reflection loss of −39.2 dB at 8.2 GHz and the absorption bandwidth of reflection loss lower than −10 dB was 3.6 GHz.

Cited by 70 publications

References 46 publications

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

ZnO Nanorod-Based Microflowers Decorated with Fe₃O₄ Nanoparticles for Electromagnetic Wave Absorption

Highlights on advances in SnO₂ quantum dots: insights into synthesis strategies, modifications and applications

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Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO2nanocrystals

Abstract: Ni-doped SnO2@MWCNTs composites were synthesized by a facile one-step hydrothermal method, and had a maximum reflection loss of −39.2 dB at 8.2 GHz and the absorption bandwidth of reflection loss lower than −10 dB was 3.6 GHz.

Cited by 70 publications

References 46 publications

Enhanced Polarization from Hollow Cube-like ZnSnO3 Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

Enhanced Polarization from Hollow Cube-like ZnSnO3 Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

ZnO Nanorod-Based Microflowers Decorated with Fe3O4 Nanoparticles for Electromagnetic Wave Absorption

Highlights on advances in SnO2 quantum dots: insights into synthesis strategies, modifications and applications

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Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO₂nanocrystals

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

Enhanced Polarization from Hollow Cube-like ZnSnO₃ Wrapped by Multiwalled Carbon Nanotubes: As a Lightweight and High-Performance Microwave Absorber

ZnO Nanorod-Based Microflowers Decorated with Fe₃O₄ Nanoparticles for Electromagnetic Wave Absorption

Highlights on advances in SnO₂ quantum dots: insights into synthesis strategies, modifications and applications