Surface-Agnoistic Highly Stretchable and Bendable Conductive MXene Multilayers
Hyosung An (1), Touseef Habib (1), Smit Shah (1), Huili Gao (2), Miladin Radovic (2,3), Micah J. Green (1,3) and Jodie L. Lutkenhaus (1,3)
1. Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX.
2. Department of Mechanical Engineering, Texas A&M University, College Station, TX.
3. Department of Materials Science and Engineering, Texas A&M University, College Station, TX.
Stretchable, bendable, and foldable conductive coatings are crucial for wearable electronics and biometric sensors. Such coatings should maintain functionality while simultaneously interfacing with different types of surfaces undergoing mechanical deformation. MXene sheets as conductive 2D nanomaterials are promising for this purpose, but it is still extremely difficult to form surface-agnostic MXene coatings that can withstand extreme mechanical deformation. Herein, we demonstrate conductive and conformal MXene multilayer coatings that can undergo large-scale mechanical deformation while maintaining a conductivity as high as 2000 S/m. MXene multilayers are successfully deposited onto flexible polymer sheet, stretchable poly(dimethylsiloxane), nylon fiber, glass, and silicon. The coating shows a recoverable resistance response to bending (up to 2.5 mm bending radius) and stretching (up to 40% tensile strain). We demonstrated that the MXene multilayer films could be used as strain sensors to topographically sense objects or materials deformation.
Keywords: MXene, Layer-by-layer assembly, Conductive coatings, Strain sensors