Flexible graphene/bacterial celluloses Janus structure film with excellent electromagnetic interference shielding and Joule heating performance

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

“…In Figure S2b, the 2D-band was deconvoluted into two Lorentzian peaks, indicating the multilayered nature of GNP with an estimated five layers and more. , This result was in good agreement with the high-magnification TEM images (Figure S3). The TEM image in Figure c shows that BC exhibited a network structure made up of extremely pure and ultrafine nanofibers …”

“…The TEM image in Figure 2c shows that BC exhibited a network structure made up of extremely pure and ultrafine nanofibers. 41 As we all know, the dispersion of GNP and BC is the key to the preparation of BC-GNP with excellent performance. As shown in Figure 2d,e, GNP filter cake prepared by a highpower ultrasonic physical method could be dispersed in water to form a uniform gray-black GNP dispersion, and its UV−vis spectrum presented the highest absorption intensity.…”

“…The film with 25 wt % GNP showed a high EMI SE of 27.4 dB (35 μm) and an in-plane TC of 33.55 W/mK . Compared to CNF and microfibrillated cellulose (MFC) obtained from plants, bacterial cellulose (BC) from bacteria possessed the distinctive features of high purity, high crystallinity, high degree of polymerization, and low cost. − Luo et al used the cycled film–liquid interface culture approach to generate BC/graphene composites . The 26.8 wt % graphene could be uniformly distributed in the BC matrix, and the mechanical and electrical properties of the composites were about 160 MPa and 1.01 S/cm, respectively.…”

Multifunctional aramid nanofibers @ polypyrrole films for broadband frequency electromagnetic interference shielding, wearable electronics, Joule heating and photothermal conversion

“…[5][6][7][8] Electromagnetic pollution has become the fth largest pollution after air pollution, water pollution, noise pollution and solid waste pollution. [9,10] In order to cope with the huge challenges brought by electromagnetic wave pollution, electromagnetic interference (EMI) shielding composites based on carbon nanotube (CNT), [11] graphene, [12] Mxene, [13] copper, [14] polypyrrole(PPy), [15] etc. have been received widely concerned.…”

Multifunctional CoFe2O4@MXene-AgNWs/Cellulose Nanofiber Composite Films with Asymmetric Layered Architecture for High-Efficiency Electromagnetic Interference Shielding and Remarkable Thermal Management Capability

“…Among them, the newly emerged two-dimensional (2D) MXene with satisfactory hydrophilicity, large specific area, metallic-like conductivity, and abundant native defects has aroused widespread attention in the EMI shielding field. − Meanwhile, AgNWs are widely used to construct CPCs with notable EMI SE and TC owing to their ultrahigh aspect ratio, brilliant electrical conductivity, remarkable heat transfer, and excellent mechanical characteristics. ,,− The design of an asymmetrical structure could combine the advantages of individual components fully and control the distribution of functional filler in a special layer, which can eliminate the restriction of the nonadjustable reflection feature in EMI shielding materials with fixed impedance matching. In addition, the asymmetrical architecture presents versatility owing to the different chemical compositions and microscopic morphologies on two sides. ,− Consequently, the construction of an asymmetric layered structure may be an ideal approach to obtaining multifunctional CPCs with high-efficiency EMI SE entailing strong EMW absorption and superior thermal management capability simultaneously.…”