Ultrahigh Conductive MXene Films for Broadband Electromagnetic Interference Shielding

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• Advanced materials are essential for high-frequency data transmission in emerging technologies.
• MXenes possess excellent electrical conductivity and electromagnetic interference (EMI) shielding properties.
• Synthesizing nitrogen-substituted MXenes presents significant challenges.

Purpose of the Study:

• To synthesize and characterize TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXene films with optimized nitrogen content.
• To investigate the impact of nitrogen substitution on MXene properties.
• To achieve enhanced electrical conductivity and broadband EMI shielding.

Main Methods:

• Synthesis of TiₓAlC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁ MAX phases.
• Fabrication of TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXene films.
• Systematic exploration of nitrogen content's effect on physical and electrical properties.
• Compositional tuning in dispersion and film forms.

Main Results:

• Achieved a record electrical conductivity of 35,000 S cm⁻¹.
• Demonstrated exceptional broadband EMI shielding across X, Kₐ, and W bands.
• Outperformed existing materials in EMI shielding, even at reduced thicknesses.
• Attained complete composition tunability in TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXenes.

Conclusions:

• TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXenes with optimized nitrogen content exhibit superior electrical and EMI shielding performance.
• These materials are highly promising for next-generation sub-terahertz electronics and conventional applications.
• The findings pave the way for advanced EMI shielding solutions.