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Mechanically strong and electrically conductive multilayer MXene nanocomposites
Jason Lipton1, Guo-Ming Weng2, Mohamed Alhabeb3
1Department of Chemical and Biomolecular Engineering, New York University, Brooklyn, New York 11201, USA. andre.taylor@nyu.edu and Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, USA.
Nanoscale
|October 22, 2019
Summary
Layer-by-layer assembly created strong, multifunctional nanocomposite films using titanium carbide (MXene) and montmorillonite clay. These films show enhanced mechanical strength and electromagnetic shielding for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Polymer nanocomposites enable the translation of nanomaterial properties to the macroscale.
- Layer-by-layer (LbL) assembly is a versatile technique for fabricating thin films.
- 2D titanium carbide nanosheets (MXene) and clay nanoplatelets offer unique material characteristics.
Purpose of the Study:
- To fabricate freestanding thin films using MXene and montmorillonite via LbL assembly.
- To investigate the multifunctional properties of these novel nanocomposite films.
- To achieve enhanced mechanical strength and electromagnetic interference (EMI) shielding.
Main Methods:
- Utilized layer-by-layer (LbL) assembly for film fabrication.
- Incorporated 2D titanium carbide nanosheets (MXene) and montmorillonite clay nanoplatelets.
- Characterized film thickness, tensile strength, EMI shielding effectiveness, and electrical conductivity.
Main Results:
- Achieved freestanding thin films with tunable thickness.
- Exhibited tensile strength ranging from 138 MPa to 225 MPa.
- Demonstrated EMI specific shielding effectiveness up to 24,550 dB cm² g⁻¹ and conductivity from 53 S m⁻¹ to 125 S m⁻¹.
- Developed the strongest MXene-based LbL film to date, attributed to a nacre-like structure.
Conclusions:
- LbL assembly is effective for creating strong, multifunctional MXene-montmorillonite nanocomposite films.
- The nacre-like structure contributes significantly to the enhanced mechanical properties.
- These films hold promise for applications in membranes, structural composites, energy storage, and aerospace materials.
