Holocellulose nanofibrils assisted exfoliation to prepare MXene-based composite film with excellent electromagnetic interference shielding performance

作者：Li, Yuehu; Chen, Yian^*; Liu, Yu; Zhang, Cunzhi; Qi, Haisong^*

来源：Carbohydrate Polymers, 2021, 274: 118652.

DOI：10.1016/j.carbpol.2021.118652

• Holocellulose
• Nanofibrils
• MXene
• Electromagnetic interference (EMI) shielding
• Multifunctional films

A high-yield and straightforward method is proposed to obtain an electromagnetic interference (EMI) shielding film based on multilayered Ti3C2Tx (m-Ti3C2Tx). Holocellulose nanofibrils modified by sulfamic acid (SHCNF) with unique "core-shell" structure can act as a dispersant and a binder to assist in exfoliating m-Ti3C2Tx into delaminated-Ti3C2Tx (d-Ti3C2Tx) and fabricate flexible Ti3C2Tx/SHCNF composite films with a high-yield value. The "brick-and-mortar" composite films exhibit a superior electromagnetic interference (EMI) shielding effectiveness (SE) of 45.02 dB with an ultrathin thickness of 40 mu m at the 12.4 GHz. Moreover, these flexible and strong integrated Ti3C2Tx/SHCNF composite films also display excellent specific EMI SE of SSE/t (4437 dB cm2 g-1) and high EMI shielding efficiency (99.996%). Therefore, the SHCNF-assisted method provides a costeffective approach to fabricate a strong and flexible MXene-based nanocomposite films toward EMI shielding application.

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