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摘要: 轻质柔性的电磁屏蔽薄膜材料的开发具有重要的意义。本文报道了一种还原氧化石墨烯与碳化硅（RGO@SiC）的多孔状电磁屏蔽薄膜，其多孔结构由3秒钟固态微波处理高效获得,该处理能高效还原氧化石墨烯，同时使薄膜厚度从大约20微米增加至200微米。当该薄膜的电磁屏蔽效能达到35.6dB时，其反射效能仅为 2.8 dB。SiC晶须在薄膜中的添加有利于电磁波的多次反射、界面极化和介电衰减。进一步，将RGO@SiC多孔薄膜按照透过层到反射层的顺序叠加，构建多层复合薄膜，并采用多壁碳纳米管纸作为反射层。当多层结构厚度为1.5毫米时，最高电磁屏蔽效能达到75.1 dB，其中反射效能仍保持在2.7 dB。我们相信该多孔状RGO@SiC 薄膜可用于设计以吸收为主的电磁屏蔽多层封装材料或三明治结构的芯层。Abstract: Development of lightweight and flexible thin films for electromagnetic interference (EMI) shielding is of great significance. In this paper, RGO@SiC porous thin films were prepared for EMI shielding. The porous structure was easily obtained by 3 s of solid phase microwave irradiation, which resulted in an efficient reduction of GO and a significant increase of the film thickness from around 20 to 200 μm. The SET of the RGO@SiC porous thin film reached 35.6 dB, while the SER was only 2.8 dB. The addition of SiC whiskers was critical for the multi-reflection, interfacial polarization and dielectric attenuation of EM waves. Further, the multilayer composites with a gradient change from transmission to reflection were constructed by stacking the RGO@SiC porous films and using multi-walled carbon nanotubes buckypaper as the reflection layer. The highest SET reached 75.1 dB with a SER value of 2.7 dB and a thickness of about 1.5 mm. We believe the porous RGO@SiC thin films were promising for designing multilayer or sandwich structure as EMI absorption packaging or lining materials.
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Figure 2. FTIR spectra of (a) SiC whiskers before and after silanization, (b) FTIR spectra, (c) XRD patterns, (d) XPS spectra, (e) Raman spectra and (f) TGA results of GO and RGO@SiC thin films
Figure 3. Cross-section morphology of RGO/SiC0, RGO/SiC1, RGO/SiC2 and RGO/SiC3 thin films (a-d) before and (e-f) after microwave irradiation
Figure 4. Electrical conductivity of RGO@SiC thin films before and after microwave irradiation
Figure 5. (a) SET, (b) SEA, (c) SER and (d) average SE values of the RGO@SiC thin films before the microwave irradiation
Figure 6. (a) SET, (b) SEA, (c) SER and (d) average SE values of the RGO@SiC thin films after the microwave irradiation
Figure 7. Morphology of (a) RGO@SiC2/3/4 stacking layers by WPU adhesives, (b) MWCNT buckypaper, and (c) multilayer composites of RGO@SiC4/3/2 and buckypaper as the reflection layers
Figure 8. (a) SET, (b) SEA, (c) SER and (d) average SE values for all the stacking sequence of the three RGO@SiC layers
Figure 9. (a) EMI SE of MWCNT buckypaper; (b) SET and (c) average SE values of the two layers and four layers composites with incident waves from top and bottom
Figure 10. (a) Mechanism schematics for EMI shielding in the multilayer composites; (b) average values of R and A for the multilayer composites with incident waves from top and bottom
Table 1. FWHM, crystal size, C/O ratio, ID/IG, surface area and average pore size of the RGO@SiC thin films
Samples FWHM (degree) Crystal size (nm) C/O ID∶IG Weight loss at 800°C Surface area (m2/g) Pore size (nm) GO \ \ 2.3 0.97 76.1% \ \ RGO/SiC0 3.444 2.371 6.8 1.20 49.0% 24.28 9.24 RGO/SiC1 2.770 2.948 7.0 1.22 39.9% 20.89 13.53 RGO/SiC2 2.726 2.993 7.1 1.28 25.7% 15.06 18.15 RGO/SiC3 2.185 3.742 7.8 1.40 17.4% 12.87 16.85 RGO/SiC4 2.394 3.410 7.6 1.44 15.2% 8.18 28.89 
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[1] Wang YY, Zhang F, Li N, et al. Carbon-based aerogels and foams for electromagnetic interference shielding: A review[J]. Carbon,2023,205:10-26. doi: 10.1016/j.carbon.2023.01.007 [2] Li W, Gao M, Miao Y, et al. Recent progress in increasing the electromagnetic wave absorption of carbon-based materials[J]. New Carbon Mater.,2023,38:111-129. doi: 10.1016/S1872-5805(23)60703-6 [3] Zhang F, Li C, Zhang Y, et al. Facile preparation of large-scale expanded graphite/polydimethylsiloxane composites for highly-efficient electromagnetic interference shielding[J]. J. Mater. Chem. A,2022,10:23145. doi: 10.1039/D2TA06263A [4] Xia T, Cao JY, Bissett MA, et al. Graphenization of graphene oxide films for strongly anisotropic thermal conduction and high electromagnetic interference shielding[J]. Carbon,2023,215:118496. doi: 10.1016/j.carbon.2023.118496 [5] Tahalyani J, Akhtar MJ, Kar KK. Flexible, stretchable, and thin films based on functionalized carbon nanofiber/graphene nanostructures for electromagnetic interference shielding[J]. ACS Appl. Nano Mater.,2023,6:8178-8191. doi: 10.1021/acsanm.3c00215 [6] Wu Y, Wang Z, Liu X, et al. Ultralight graphene foam/conductive polymer composites for exceptional electromagnetic interference shielding[J]. ACS Appl. Mater. Interfaces,2017,9:9059-9069. doi: 10.1021/acsami.7b01017 [7] Wan YJ, Zhu PL, Yu SH, et al. Graphene paper for exceptional EMI shielding performance using large-sized graphene oxide sheets and doping strategy[J]. Carbon,2017,122:74-81. doi: 10.1016/j.carbon.2017.06.042 [8] Kumar N, Kuanr BK. Single and double-layered tri-band microwave absorbing materials[J]. Ceram. Int.,2023,49:32458-32469. doi: 10.1016/j.ceramint.2023.07.204 [9] Duan Y, Xiao Z, Yan X, et al. Enhanced electromagnetic microwave absorption property of peapod-like MnO@carbon nanowires[J]. ACS Appl. Mater. Interfaces,2018,10:40078-40087. doi: 10.1021/acsami.8b11395 [10] Zhao Y, Zhang Y, Yang C, et al. Ultralight and flexible SiC nanoparticle-decorated carbon nanofiber mats for broad-band microwave absorption[J]. Carbon,2021,171:474-483. doi: 10.1016/j.carbon.2020.09.040 [11] Dong S, Zhang X, Li X, et al. SiC whiskers-reduced graphene oxide composites decorated with MnO nanoparticles for tunable microwave absorption[J]. Chem. Eng. J.,2020,392:123817. doi: 10.1016/j.cej.2019.123817 [12] Cai Y, Li Y, Huang S, et al. Broadband electromagnetic shielding performance of carbon nanotube-carbon fibre/silicon carbide cross-scale laminated composites[J]. Ceram. Int.,2022,48:26177-26187. doi: 10.1016/j.ceramint.2022.05.299 [13] Ma L, Hamidinejad M, Liang C, et al. Enhanced electromagnetic wave absorption performance of polymer/SiC-nanowire/MXene (Ti3C2Tx) composites[J]. Carbon,2021,179:408-416. doi: 10.1016/j.carbon.2021.04.063 [14] Liang C, Song P, Ma A, et al. Highly oriented three-dimensional structures of Fe3O4 decorated CNTs/reduced graphene oxide foam/epoxy nanocomposites against electromagnetic pollution[J]. Compos. Sci. Technol.,2019,181:107683. doi: 10.1016/j.compscitech.2019.107683 [15] Hu B, Guo H, Li J, et al. Dual-encapsulated phase change composites with hierarchical MXene-graphene monoliths in graphene foam for high-efficiency thermal management and electromagnetic interference shielding[J]. Compos. Part B-Eng.,2023,266:110998. doi: 10.1016/j.compositesb.2023.110998 [16] Tang X, Luo J, Hu Z, et al. Ultrathin, flexible, and oxidation-resistant MXene/graphene porous films for efficient electromagnetic interference shielding[J]. Nano Research,2023,16:1755-1763. doi: 10.1007/s12274-022-4841-1 [17] Sheng A, Ren W, Yang Y, et al. Multilayer WPU conductive composites with controllable electro-magnetic gradient for absorption-dominated electromagnetic interference shielding[J]. Compo. Part A-Appl. S.,2020,129:105692. doi: 10.1016/j.compositesa.2019.105692 [18] Yang J, Liao X, Wang G, et al. Heterogeneous silicon rubber composite foam with gradient porous structure for highly absorbed ultra-efficient electromagnetic interference shielding[J]. Compos. Sci. Technol.,2021,206:108663. doi: 10.1016/j.compscitech.2021.108663 [19] Kim M, Kim S, Seong Y C, et al. Multiwalled carbon nanotube buckypaper/polyacrylonitrile nanofiber composite membranes for electromagnetic interference shielding[J]. ACS Appl. Nano Mater.,2021,4(1):729-738. doi: 10.1021/acsanm.0c03040 [20] Hu Y, Li D, Wu L, et al. Carbon nanotube buckypaper and buckypaper/polypropylene composites or high shielding effectiveness and absorption-dominated shielding material[J]. Compos. Sci. Technol.,2019,181:107699. doi: 10.1016/j.compscitech.2019.107699 [21] Jiang WS, Yang C, Chen GX, et al. Preparation of high-quality graphene using triggered microwave reduction under an air atmosphere[J]. J. Mater. Chem. C,2018,6(7):1829-1835. doi: 10.1039/C7TC03957C [22] Sun Y, Qiu S, Fang Z, et al. Rapid synthesis of oxygen-deficient MoO3-x-rGO composites for synergistic photothermal seawater desalination and photocatalytic sterilization[J]. ACS Sustainable Chem. Eng.,2023,11:3359-3369. doi: 10.1021/acssuschemeng.2c06417 [23] Voiry D, Yang J, Kupferberg J, et al. High-quality graphene via microwave reduction of solution-exfoliated graphene oxide[J]. Science,2016,353:1413-1416. doi: 10.1126/science.aah3398 [24] Hu H, Zhao Z, Zhou Q, et al. The role of microwave absorption on formation of graphene from graphite oxide[J]. Carbon,2012,50:3267-3273. doi: 10.1016/j.carbon.2011.12.005 [25] Tamang S, Aravindan S. 3D numerical modelling of microwave heating of SiC susceptor[J]. Appl. Therm. Eng.,2019,162:114250. doi: 10.1016/j.applthermaleng.2019.114250 [26] Yang W, Yan L, Jiang B, et al. Crumpled nitrogen-doped porous carbon nanosheets derived from petroleum pitch for high-performance and flexible electromagnetic wave absorption [J], Ind. Eng. Chem. Res. , 2022, 61: 2799−2808. [27] Yang W, Jiang B, Che S, et al. Research progress on carbon-based materials for electromagnetic wave absorption and the related mechanisms[J]. New Carbon Mater.,2021,36:1016-1033. doi: 10.1016/S1872-5805(21)60095-1 [28] Yang W, Bai H, Jiang B, et al. Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding[J]. Nano Res.,2022,15:9926-9935. doi: 10.1007/s12274-022-4414-3 -
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