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Excellent microwave absorption property of Graphene-coated Fe nanocomposites.

Zhao X, Zhang Z, Wang L, Xi K, Cao Q, Wang D, Yang Y, Du Y - Sci Rep (2013)

Bottom Line: In addition, large specific surface area, low density and high chemical stability make graphene act as an ideal coating material.Due to the charge transfer at Fe-graphene interface in Fe/G, the nanocomposites show distinct dielectric properties, which result in excellent microwave absorption performance in a wide frequency range.This work provides a novel approach for exploring high-performance microwave absorption material as well as expands the application field of graphene-based materials.

View Article: PubMed Central - PubMed

Affiliation: Nanjing National Laboratory of Microstructures and Jiangsu Provincial laboratory for Nanotechnology, Department of Physics, Nanjing University, Nanjing 210093, P. R. China.

ABSTRACT
Graphene has evoked extensive interests for its abundant physical properties and potential applications. It is reported that the interfacial electronic interaction between metal and graphene would give rise to charge transfer and change the electronic properties of graphene, leading to some novel electrical and magnetic properties in metal-graphene heterostructure. In addition, large specific surface area, low density and high chemical stability make graphene act as an ideal coating material. Taking full advantage of the aforementioned features of graphene, we synthesized graphene-coated Fe nanocomposites for the first time and investigated their microwave absorption properties. Due to the charge transfer at Fe-graphene interface in Fe/G, the nanocomposites show distinct dielectric properties, which result in excellent microwave absorption performance in a wide frequency range. This work provides a novel approach for exploring high-performance microwave absorption material as well as expands the application field of graphene-based materials.

No MeSH data available.


Related in: MedlinePlus

Frequency dependence of (a) relative permittivity, and (b) relative permeability for Fe/G and the control group.
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f5: Frequency dependence of (a) relative permittivity, and (b) relative permeability for Fe/G and the control group.

Mentions: Figure 5a and 5b show the frequency dependence of εr and μr for the samples in the range of 2 ~ 18 GHz, respectively. As shown in Fig. 5a, is almost independent on frequency. But in the case of Fe/G, a largely enhanced is observed and it decreases with increasing frequency, showing an obvious dielectric dispersion. This phenomenon was seldom observed in other coating structures, such as Fe/ZnO, FeNi3/SiO2, Fe3O4/Fe/SiO2, and Fe/C23423, which plays a key role in achieving good impedance match. As for the imaginary part (ε″) of the permittivity (Fig. 5b), the value of is larger than that of , indicating an increased dielectric loss. Unlike the dielectric behavior, there are no significant changes of permeability properties between Fe/G and the control group. and show a similar frequency dependence, while the values of and are almost same, indicating a small difference of magnetic loss between FG and the control group.


Excellent microwave absorption property of Graphene-coated Fe nanocomposites.

Zhao X, Zhang Z, Wang L, Xi K, Cao Q, Wang D, Yang Y, Du Y - Sci Rep (2013)

Frequency dependence of (a) relative permittivity, and (b) relative permeability for Fe/G and the control group.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3852363&req=5

f5: Frequency dependence of (a) relative permittivity, and (b) relative permeability for Fe/G and the control group.
Mentions: Figure 5a and 5b show the frequency dependence of εr and μr for the samples in the range of 2 ~ 18 GHz, respectively. As shown in Fig. 5a, is almost independent on frequency. But in the case of Fe/G, a largely enhanced is observed and it decreases with increasing frequency, showing an obvious dielectric dispersion. This phenomenon was seldom observed in other coating structures, such as Fe/ZnO, FeNi3/SiO2, Fe3O4/Fe/SiO2, and Fe/C23423, which plays a key role in achieving good impedance match. As for the imaginary part (ε″) of the permittivity (Fig. 5b), the value of is larger than that of , indicating an increased dielectric loss. Unlike the dielectric behavior, there are no significant changes of permeability properties between Fe/G and the control group. and show a similar frequency dependence, while the values of and are almost same, indicating a small difference of magnetic loss between FG and the control group.

Bottom Line: In addition, large specific surface area, low density and high chemical stability make graphene act as an ideal coating material.Due to the charge transfer at Fe-graphene interface in Fe/G, the nanocomposites show distinct dielectric properties, which result in excellent microwave absorption performance in a wide frequency range.This work provides a novel approach for exploring high-performance microwave absorption material as well as expands the application field of graphene-based materials.

View Article: PubMed Central - PubMed

Affiliation: Nanjing National Laboratory of Microstructures and Jiangsu Provincial laboratory for Nanotechnology, Department of Physics, Nanjing University, Nanjing 210093, P. R. China.

ABSTRACT
Graphene has evoked extensive interests for its abundant physical properties and potential applications. It is reported that the interfacial electronic interaction between metal and graphene would give rise to charge transfer and change the electronic properties of graphene, leading to some novel electrical and magnetic properties in metal-graphene heterostructure. In addition, large specific surface area, low density and high chemical stability make graphene act as an ideal coating material. Taking full advantage of the aforementioned features of graphene, we synthesized graphene-coated Fe nanocomposites for the first time and investigated their microwave absorption properties. Due to the charge transfer at Fe-graphene interface in Fe/G, the nanocomposites show distinct dielectric properties, which result in excellent microwave absorption performance in a wide frequency range. This work provides a novel approach for exploring high-performance microwave absorption material as well as expands the application field of graphene-based materials.

No MeSH data available.


Related in: MedlinePlus