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. 2021 Mar 16;13(1):91.
doi: 10.1007/s40820-021-00624-4.

Lightweight, Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

Ping Song  1 , Bei Liu  1   2 , Chaobo Liang  1 , Kunpeng Ruan  1 , Hua Qiu  1 , Zhonglei Ma  1 , Yongqiang Guo  1 , Junwei Gu  3
Affiliations

Lightweight, Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

Ping Song et al. Nanomicro Lett. .

Abstract

In order to ensure the operational reliability and information security of sophisticated electronic components and to protect human health, efficient electromagnetic interference (EMI) shielding materials are required to attenuate electromagnetic wave energy. In this work, the cellulose solution is obtained by dissolving cotton through hydrogen bond driving self-assembly using sodium hydroxide (NaOH)/urea solution, and cellulose aerogels (CA) are prepared by gelation and freeze-drying. Then, the cellulose carbon aerogel@reduced graphene oxide aerogels (CCA@rGO) are prepared by vacuum impregnation, freeze-drying followed by thermal annealing, and finally, the CCA@rGO/polydimethylsiloxane (PDMS) EMI shielding composites are prepared by backfilling with PDMS. Owing to skin-core structure of CCA@rGO, the complete three-dimensional (3D) double-layer conductive network can be successfully constructed. When the loading of CCA@rGO is 3.05 wt%, CCA@rGO/PDMS EMI shielding composites have an excellent EMI shielding effectiveness (EMI SE) of 51 dB, which is 3.9 times higher than that of the co-blended CCA/rGO/PDMS EMI shielding composites (13 dB) with the same loading of fillers. At this time, the CCA@rGO/PDMS EMI shielding composites have excellent thermal stability (THRI of 178.3 °C) and good thermal conductivity coefficient (λ of 0.65 W m-1 K-1). Excellent comprehensive performance makes CCA@rGO/PDMS EMI shielding composites great prospect for applications in lightweight, flexible EMI shielding composites.

Keywords: Cellulose carbon aerogel; Electromagnetic interference shielding; Polydimethylsiloxane; Reduced graphene oxide.

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Figures

Fig. 1
Fig. 1
Schematic illustration of the fabrication procedure for CCA@rGO/PDMS EMI shielding composites (a), illustration of the flexibility (b) and resilience (c-c’’) of CCA@rGO aerogel
Fig. 2
Fig. 2
FTIR (a), Raman (b), XPS spectra (c) and high-resolution C 1s (c’) of CA, CA@GO and CCA@rGO
Fig. 3
Fig. 3
SEM images of CA (a), CCA (b-b’), CCA@rGO (c-c’) and the CCA@rGO/PDMS EMI shielding composites (d)
Fig. 4
Fig. 4
σ of the PCCA/PDMS and CCA/PDMS EMI shielding composites (a) and P(CCA@rGO)/PDMS and CCA@rGO/PDMS EMI shielding composites (b)
Fig. 5
Fig. 5
EMI SET of the PCCA/PDMS EMI shielding composites (a), EMI SET of the CCA/PDMS EMI shielding composites (b), EMI SET of the P(CCA@rGO)/PDMS EMI shielding composites (c), EMI SET (d), EMI SEA and SER (d’) of the CCA@rGO/PDMS EMI shielding composites, schematic illustration of EMI shielding mechanism (e)
Fig. 6
Fig. 6
λ (a), α (b), 3D infrared thermal images (c) and surface temperature curves vs heating time (d) of the CCA@rGO/PDMS EMI shielding composites
Fig. 7
Fig. 7
Stress–strain curves (a), tensile strength (b), elongation at break (c) and hardness (d) of the CCA@rGO/PDMS EMI shielding composites
Fig. 8
Fig. 8
σ (a) and EMI SET (b) values of CCA@rGO/PDMS EMI shielding composites after bending fatigue
Fig. 9
Fig. 9
DSC curves (a) and TGA curves (b) of the CCA@rGO/PDMS EMI shielding composites
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