Lightweight Nanostructures of Cellulose Nanofibers and Ti3C2Tx MXenes for Their Application in Electromagnetic Interference Shielding

MXenes, a large family of titanium carbides and nitrides,have emerged as potential electromagnetic interference (EMI) shieldingmaterials due to their outstanding electrical properties and lightness.However, the fragility of structures constructed exclusively from thesetwo-dimensional materials suggests the complementary use of othernanomaterials as primary building blocks, with MXenes serving asactive-conductive fillers. Compared to MXenes alone, these hybridstructures demonstrate significant mechanical improvements without asignificant loss of electrical properties due to the synergy betweenporosity and the lamellar structure. This study explores the use ofbiodegradable cellulose nanofibrils (CNFs) as non-active building blocksfor the fabrication of nanohybrid structures. We use Ti3C2Tx MXenes asactive-conductive nanofillers in a simple process where bothcomponents are dispersed and freeze-dried to produce EMI shielding aerogels. This process minimizes MXene waste whilemaintaining total shielding effectiveness (SET) values around 20 dB. The way in which MXenes are incorporated into the finalmaterial is crucial, and a method to optimize their properties and achieve the obtained SET values has been identified

Lightweight Nanostructures of Cellulose Nanofibers and Ti3C2Tx MXenes for Their Application in Electromagnetic Interference Shielding Articles