Journal
ACS NANO
Volume 15, Issue 7, Pages 12405-12417Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c04526
Keywords
MXenes; cellulose nanofibers; mechanical properties; EMI shielding; electro-/photothermal deicing
Categories
Funding
- National Natural Science Foundation of China [51903166]
- Sichuan Science and Technology Program [2020YJ0261, 2020SCUNG203]
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This study proposes a layer-by-layer assembly of cellulose nanofiber and two-dimensional titanium carbide composite materials on bacterial cellulose substrate, preparing multifunctional films with excellent performance in flexibility, mechanical strength, toughness, electromagnetic shielding efficiency, and electro/photothermal heating. The densely packed hierarchical structure and strong interfacial interactions contribute to the outstanding mechanical properties of the films, making them promising for practical applications in EMI shielding and ice accretion elimination.
The development of modern electronics has raised great demand for multifunctional materials to protect electronic instruments against electromagnetic interference (EMI) radiation and ice accretion in cold weather. However, it is still a great challenge to prepare high-performance multifunctional films with excellent flexibilty, mechanical strength, and durability. Here, we propose a layer-by-layer assembly of cellulose nanofiber (CNF)/Ti3C2Tx nanocomposites (TM) on a bacterial cellulose (BC) substrate via repeated spray coating. CNFs are hybridized with Ti3C2Tx nanoflakes to improve the mechanical properties of the functional coating layer and its adhesion with the BC substrate. The densely packed hierarchical structure and strong interfacial interactions endows the TM/ BC films with good flexibility, ultrahigh mechanical strength (>250 MPa), and desirable toughness (>20 MJ cm(-3)). Furthermore, benefiting from the densely packed hierarchical structure, the resultant TM/BC films present outstanding EMI shielding effictiveness of 60 dB and efficient electro-/photothermal heating performance. Silicone encapsulation further imparts high hydrophobicity and exceptional durability against solutions and deformations to the multifunctional films. Impressively, the silicone-coated TM/BC film (SiTM/BC) exhibits desirable low voltage-driven Joule heating and excellent photoresponsive heating performance, which demonstrates great feasibility for efficient thermal deicing under actual conditions. Therefore, we believe that the Si-TM/BC film with excellent mechanical properties and durability holds great promise for the practical applications of EMI shielding and ice accretion elimination.
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