Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent Fe@γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Synthesis of Ferromagnetic Nanoparticles Supported on Graphene Oxide
2.3. Characterization
3. Results
3.1. Optimization of the Citric Acid to Ethylene Glycol (CA:EG) and Metal Precursor (CA:M) Ratios
3.2. Characterization of the Chemical Composition of the ZVI Nanoparticles Deposited onto rGO
3.3. Synthesis and Characterization of Fe/Co/Ni Alloy NPs Deposited onto rGO
3.4. Characterization of the Nanocomposites Magnetic Properties and Microwave Absorption Behavior
4. Discussion
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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CA:M Ratio | ||
---|---|---|
CA:EG Ratio | 3:1 | 6:1 |
1:1 | 16.8 ± 6.5 nm | 14.8 ± 4.7 nm |
1:1.5 | 17.9 ± 8.1 nm | 14.3 ± 7.2 nm |
1:11 | 18.3 ± 9.6 nm | 19.7 ± 10.4 nm |
Nanocomposite | T | δ | ε, ΔEQ | Bhf | Г/2 | Relative Area | Sites |
---|---|---|---|---|---|---|---|
[K] | [mm/s] | [mm/s] | [Tesla] | [mm/s] | [%] | ||
ZVI@rGO | 77 | 0.05(1) | – | – | 0.18 * | 4 | γ-Fe (fcc) |
0.11(1) | 0 | 34.1 | 0.21(1) | 86 | α-Fe (bcc) | ||
0.43(1) | 0 | 39 | 0.28 * | 10 | γ-Fe2O3 | ||
FeCo@rGO | 77 | 0.12(1) | 0 | 34.6 | 0.22(1) | 100 | FeCo alloy |
FeNi@rGO | 77 | 0.16(1) | 0.35(1) | – | 0.15 * | 6 | superparamagnetic phase |
0.027(1) 0.06(2) | −0.018(1) 0.01(1) | 34.1 31.5 | 0.20(1) 0.29(1) | 24 70 | FeNi (fcc) alloy | ||
FeCoNi@rGO | 77 | 0.35(1) | −0.07(1) | 21.2 | 0.40(1) | 30 | Fe carbide |
0.15(1) | −0.05(1) | 32 | 0.17(1) | 70 | FeCoNi (fcc) alloy |
EDX | ICP | |||||
---|---|---|---|---|---|---|
Alloy NPs | % Fe | % Co | % Ni | % Fe | % Co | % Ni |
FeCo | 47 ± 4 | 53 ± 6 | – | 49 | 51 | – |
FeNi | 48 ± 3 | – | 52 ± 3 | 52 | – | 48 |
FeCoNi | 30 ± 8 | 36 ± 5 | 34 ± 6 | 32 | 34 | 34 |
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Mederos-Henry, F.; Mahin, J.; Pichon, B.P.; Dîrtu, M.M.; Garcia, Y.; Delcorte, A.; Bailly, C.; Huynen, I.; Hermans, S. Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent Fe@γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide. Nanomaterials 2019, 9, 1196. https://doi.org/10.3390/nano9091196
Mederos-Henry F, Mahin J, Pichon BP, Dîrtu MM, Garcia Y, Delcorte A, Bailly C, Huynen I, Hermans S. Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent Fe@γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide. Nanomaterials. 2019; 9(9):1196. https://doi.org/10.3390/nano9091196
Chicago/Turabian StyleMederos-Henry, Francisco, Julien Mahin, Benoit P. Pichon, Marinela M. Dîrtu, Yann Garcia, Arnaud Delcorte, Christian Bailly, Isabelle Huynen, and Sophie Hermans. 2019. "Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent Fe@γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide" Nanomaterials 9, no. 9: 1196. https://doi.org/10.3390/nano9091196