Multifunctional MXene/Aramid Nanofiber Composite Films for Efficient Electromagnetic Interference Shielding and Repeatable Early Fire Detection

Abstract

Rapid development of highly integrated electronic and telecommunication devices has led to urgent demands for electromagnetic interference (EMI) shielding materials that incorporate flame retardancy, and more desirably the early fire detection ability, due to the potential fire hazards caused by heat propagation and thermal failure of the devices during operation. Here, multifunctional flexible films having the main dual functions of high EMI shielding performance and repeatable fire detection ability are fabricated by vacuum filtration of the mixture of MXene and aramid nanofiber (ANF) suspensions. ANFs serve to reinforce MXene films via the formation of hydrogen bonding between the carbonyl groups of ANFs and the hydroxyl groups of MXene. When the ANF content is 20 wt %, the tensile strength of the film is increased from 24.6 MPa for a pure MXene film to 79.5 MPa, and such a composite film (9 μm thickness) exhibits a high EMI shielding effectiveness (SE) value of ∼40 dB and a specific SE (SSE) value of 4361.1 dB/mm. Upon fire exposure, the composite films can trigger the fire detection system within 10 s owing to the thermoelectric property of MXene. The self-extinguishing feature of ANFs ensures the structural integrity of the films during burning, thus allowing for continuous alarm signals. Moreover, the films also exhibit excellent Joule heating and photothermal conversion performances with rapid response and sufficient heating reliability.

Eco-friendly and multifunctional aluminum flake/carbon fiber/cellulose composite papers with electromagnetic interference shielding

“…The results prove that the manufactured composite paper, reinforced with recycled 1D and 2D materials, reaches the commercially required EMSE values. 49,50 With the increasing filler ratio and sample thickness, the EMSE efficiency increases, and more sensitive characteristics arise around 8.8, 10.2, and 11.8 GHz frequencies. For example, the 80-90 sample exhibits a smoother curve, suggesting that the possible EM wave leakage and vulnerable regions are minimized compared to the 80-30 and 80-60 samples (Figure 7(d)).…”

Multifunctional MXene-based composite films with simultaneous terahertz/gigahertz wave shielding performance for future 6G communication

“…4 Therefore, the development of EMI shielding materials is greatly needed for future 6G devices. 5,6 In contrast with the recently developed EMI shielding materials for 4G/5G communication, [7][8][9][10][11][12][13][14][15] 6G EMI shielding materials require a more excellent overall performance, and there exist two main problems that should be solved. First, 6G EMI shielding materials require multiple-band EMI shielding performance.…”

Enhanced electromagnetic interference shielding effectiveness in multiphase nanocomposites based on poly(vinylidene fluoride‐co‐hexafluoropropylene), nano‐Fe2O3, graphene nanoplatelets, and nanodiamonds

“…11,[17][18][19][20] Moreover, conductive fillers like carbon black, graphite, graphene, MXenes, and so forth, were also reinforced into a hosting polymer matrix to achieve efficient shielding materials. 15,16,21,22 The beneficial approach for shielding materials is the combination of the electronic conductivity of nanofillers with the mechanical properties provided by the insulating polymer matrices. [1][2][3][4]7,11 PVDF is one of the most researched polymer systems because of its remarkable piezoelectric and pyro-electric capabilities.…”

“…Transition metal oxides NPs such as iron oxide (Fe 2 O 3 ), zinc oxide (ZnO), silicon dioxide (SiO 2 ), zirconium oxide (ZrO 2 ), and titanium dioxide (TiO 2 ) are used as nanofillers in PNCs for EMI shielding application 11,17–20 . Moreover, conductive fillers like carbon black, graphite, graphene, MXenes, and so forth, were also reinforced into a hosting polymer matrix to achieve efficient shielding materials 15,16,21,22 . The beneficial approach for shielding materials is the combination of the electronic conductivity of nanofillers with the mechanical properties provided by the insulating polymer matrices 1–4,7,11 …”