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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.


Calculated reflection loss of different thickness for (a) control group, and (b) Fe/G.The dash line is a guide of eye to show the frequency range in which RL is less than −10 dB.
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f6: Calculated reflection loss of different thickness for (a) control group, and (b) Fe/G.The dash line is a guide of eye to show the frequency range in which RL is less than −10 dB.

Mentions: Based on the data of εr and μr, we calculated the reflection loss (RL) of the samples according to the transmission line theory1, where Zin is the input impedance of the absorber, f is the frequency of microwave, d is the thickness of the absorber and c is the velocity of light in free space. As illustrated in Fig. 6a, the values of RL for the control group are larger than −10 dB with the thickness ranging from 1.5 to 4.0 mm, showing weak microwave absorption ability. However, when Fe nanoparticles are coated with graphene, the microwave absorption properties of Fe/G nanocomposites are substantially enhanced. For different thickness, the peak values of RL for Fe/G are all in the vicinity of −30 dB and the minimum RL is about −45 dB at 7.1 GHz. It is well known that the effective bandwidth (the frequency range in which RL is less than −10 dB) is another important parameter to evaluate the microwave absorption performance. As shown in Fig. 6b, Fe/G nanocomposites have broad effective bandwidth and it reaches the maximum of 4.4 GHz with the thickness of 2.0 mm, which is larger than that of other Fe-based coated composites2624. Comparing with other coating layers, such as SiO2, Al2O3 or ZnO, the density of graphene is quite low, which makes Fe/G a light absorber for microwave absorption.


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)

Calculated reflection loss of different thickness for (a) control group, and (b) Fe/G.The dash line is a guide of eye to show the frequency range in which RL is less than −10 dB.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: Calculated reflection loss of different thickness for (a) control group, and (b) Fe/G.The dash line is a guide of eye to show the frequency range in which RL is less than −10 dB.
Mentions: Based on the data of εr and μr, we calculated the reflection loss (RL) of the samples according to the transmission line theory1, where Zin is the input impedance of the absorber, f is the frequency of microwave, d is the thickness of the absorber and c is the velocity of light in free space. As illustrated in Fig. 6a, the values of RL for the control group are larger than −10 dB with the thickness ranging from 1.5 to 4.0 mm, showing weak microwave absorption ability. However, when Fe nanoparticles are coated with graphene, the microwave absorption properties of Fe/G nanocomposites are substantially enhanced. For different thickness, the peak values of RL for Fe/G are all in the vicinity of −30 dB and the minimum RL is about −45 dB at 7.1 GHz. It is well known that the effective bandwidth (the frequency range in which RL is less than −10 dB) is another important parameter to evaluate the microwave absorption performance. As shown in Fig. 6b, Fe/G nanocomposites have broad effective bandwidth and it reaches the maximum of 4.4 GHz with the thickness of 2.0 mm, which is larger than that of other Fe-based coated composites2624. Comparing with other coating layers, such as SiO2, Al2O3 or ZnO, the density of graphene is quite low, which makes Fe/G a light absorber for microwave absorption.

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.