Flexible, Stretchable, and Transparent MXene Nanosheet/Thermoplastic Polyurethane Films for Multifunctional Heating and Electromagnetic Interference Shielding

Abstract

The development of multifunctional electromagnetic interference (EMI) shielding films with optical transparency is highly urgent as visual windows in modern optoelectronic devices. Herein, Ti 3 C 2 T x nanosheet (MXene)-based transparent conductive films (TCFs) with thermoplastic polyurethane (TPU) as substrates were prepared by simple spraying, which was further applied in high-performance EMI shielding, Joule heating, and photothermal conversion. The comprehensive properties of the transparent MXene/TPU films can be optimized by adjusting the thickness of the MXene layer. The optimal TCF showed a sheet resistance of 119.1 Ω/sq, a transmittance of 43.1%, and an average EMI shielding effectiveness of 10.9 dB. Meanwhile, this TCF exhibited a stable EMI shielding performance to resist bending and stretching. Moreover, the multifunctional MXene/TPU film presented remarkable thermal management performances, including Joule heating (89.4 °C @ 7 V) and photothermal conversion (72 °C @ 100 mW/cm 2 ) abilities. This work presents flexible and stretchable MXene-based TCFs with satisfactory EMI shielding performance and multisource thermal response behavior, which is promising for various transparent and flexible electronic devices.

Multifunctional Wearable Device Based on an Antibacterial and Hydrophobic Silver Nanoparticles/Ti3C2Tx MXene/Thermoplastic Polyurethane Fibrous Membrane for Electromagnetic Shielding and Strain Sensing

“…TPU and Ti 3 C 2 T x are bonded by hydrogen bonds. However, the insufficiently hydrophilic surface of TPU is not conducive to the adhesion of Ti 3 C 2 T x . Therefore, an ultrasound-assisted strategy is used to modify TPU with Ti 3 C 2 T x .…”

“…However, the insufficiently hydrophilic surface of TPU is not conducive to the adhesion of Ti 3 C 2 T x . 47 Therefore, an ultrasound-assisted strategy is used to modify TPU with Ti 3 C 2 T x . The surface temperature of the TPU fiber increases and thus softens during ultrasonication, while the Ti 3 C 2 T x nanosheets move violently in the solution.…”

Strain Sensors for Human Movement Detection Based on Fibrous Membranes Comprising Thermoplastic Polyurethane, Ag Nanoparticles, and Carbon Nanotubes

“…To develop stretchable strain sensors, various conductive fillers are incorporated into TPU fibrous membranes to impart electrical conductivity. So far, metal materials, 32,33 conductive polymers, 34,35 carbon nanotubes, 36 graphene, 37 and MXene 38 have been commonly used as conductive fillers. Among them, lowdimensional nanomaterials such as metal nanoparticles can effectively enhance the sensitivity of strain sensors due to their outstanding electrical conductivity and small dimensions.…”

Carbon nanotube films embedded with Cu@C nanocubes for electromagnetic interference shielding

“…1,2 Therefore, the demand for electromagnetic interference (EMI) shielding materials with high flexibility are increasing to protect human health and environmental safety. [3][4][5][6][7][8] Undoubtedly, traditional metal based EMI shielding materials cannot be used for the disadvantages of high density, easy corrosion, narrow absorption bandwidth, and poor dispersion. 9 As a result, the lighter, thinner and flexible EMI films have become a research hotspot.…”

“…In recent years, the rapidly upgrading of electronic devices has exacerbated electromagnetic (EM) radiation pollution, especially the popularization of portable and wearable smart electronic products in national defense and civilian fields 1,2 . Therefore, the demand for electromagnetic interference (EMI) shielding materials with high flexibility are increasing to protect human health and environmental safety 3–8 . Undoubtedly, traditional metal based EMI shielding materials cannot be used for the disadvantages of high density, easy corrosion, narrow absorption bandwidth, and poor dispersion 9 .…”