Strong, hydrophobic, and transparent wood film decorated with MXene/silver nanowire for electromagnetic interference shielding and electrothermal conversion

Facing the continuous development and expansion of electronic devices and consequently increasing severe electromagnetic pollution, new requirements are put forward for electromagnetic interference (EMI) shielding materials, such as high transparency, mechanically robust, and flexibility. However, developing bio-based electromagnetic shielding materials that meet the above requirements remains challenging. Herein, a bio-based transparent wood prepared by delignification and TEMPO-mediated oxidation was used as the substrate, on which a durable hybrid conductive network containing MXene, silver nanowire (AgNW), and hydrophobic regents was assembled to prepare the multifunctional transparent film. The EMI shielding effect value of the obtained hydrophobic MXene/AgNW-decorated transparent wood (H-MATW) film was 31.5 dB with a corresponding transparency of 31.7%, which ascribing to excellent electroconductivity of the MXene/AgNW hybrid conductive network. Moreover, the tensile strength of H-MATW is as high as 406.5 MPa, attributed to the dense structure and strong hydrogen bonds between the cellulose chains in the transparent wood substrate. Furthermore, it exhibited tunable and low-pressure driving electrothermal conversion performance, reaching a temperature of 91 °C at only 4 V voltage. This work reports on bio-based candidate EMI shielding transparent film that can be used in visual windows and smart devices, providing a new pathway for developing flexible EMI shielding and electrothermal conversion materials.