Facile fabrication of flexible and ultrathin self-assembled Ti3C2T /bacterial cellulose composite films with multifunctional electromagnetic shielding and photothermal conversion performances

The ultrathin and flexible Ti 3 C 2 T x /BC composite films with uniform lamellar structures have been developed by combining experimental and theoretical works, exhibiting remarkable EMI shielding and photothermal conversion performances, which have great potential for the protection of electronic devices. • The ultrathin and flexible Ti 3 C 2 T x /BC composite films have been facile fabricated. • The interfacial interaction of Ti 3 C 2 T x /BC has been understood by theoretical study. • Combining superior EMI shielding and photothermal conversion are achieved. • The Ti 3 C 2 T x /BC film displays stable and fast-response photothermal characteristics. • The multifunctional Ti 3 C 2 T x /BC films have great potential for electronic devices. With the rapid development of modern electronics, the next generation of electromagnetic interference (EMI) shielding materials requires ultrathin, lightweight, flexibility and robustness to protect electronic devices from radiation pollution. In this study, the multifunctional Ti 3 C 2 T x /Bacterial Cellulose (Ti 3 C 2 T x /BC) composite films with uniformly lamellar structures have been developed by combining experimental and theoretical works. The microstructures, mechanical properties, EMI shielding and photothermal conversion performances of Ti 3 C 2 T x /BC composite films have been systematically investigated. It is highlighted that the resultant ultrathin and flexible Ti 3 C 2 T x /BC composite film with a Ti 3 C 2 T x content of 50 wt% exhibits satisfactory tensile strength of 109.6±4.5 MPa, excellent electrical conductivity of 5020 S m -1 and EMI SE value of 43.7 dB. More interestingly, the composite film displays stable and fast-response photothermal characteristics, with the photothermal conversion temperature up to 74.5 ℃. This study proposes a versatile strategy to synthesize multifunctional MXene/BC composite films with satisfactory mechanical properties, high performance EMI shielding and photothermal conversion effects, which shows great potential for the protection of electronic devices.