Printable Boron Nitride-Liquid Metal Hybrid Thermal Interface Materials for Advanced Electronics.

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Modern electronics require advanced thermal management solutions due to high power densities and compact designs.
• Existing thermal interface materials (TIMs) often struggle to balance high thermal conductivity with mechanical flexibility.
• Developing conformable materials is essential for effective heat dissipation in complex electronic architectures.

Purpose of the Study:

• To develop a novel hybrid thermal interface material (TIM) with enhanced thermal conductivity and mechanical flexibility.
• To investigate the integration of two-dimensional boron nitride nanosheets (BNNS) and liquid metal (LM) nanoparticles within a polydimethylsiloxane (PDMS) matrix.
• To optimize filler interactions and 3D printing processes for improved heat transfer and adaptability in flexible electronics.

Main Methods:

• Fabrication of a hybrid TIM by incorporating BNNS and LM nanoparticles into a photocurable PDMS matrix.
• Interfacial engineering to promote uniform filler dispersion and create a continuous thermal network.
• Utilizing Digital Light Processing (DLP) 3D printing for precise fabrication of the TIM.
• Characterization of thermal conductivity, Young's modulus, electrical insulation, and mechanical stability under deformation.

Main Results:

• The hybrid BN-LM TIM achieved high thermal conductivity while maintaining an ultralow Young's modulus (0.07 MPa), indicating excellent flexibility.
• Optimized filler dispersion and network formation significantly enhanced heat transfer efficiency.
• The material demonstrated superior conformability to complex surfaces, reducing thermal contact resistance.
• The composite exhibited excellent electrical insulation and mechanical stability during repeated deformation cycles.

Conclusions:

• The developed hybrid BN-LM TIM effectively bridges efficient heat transport with structural adaptability for advanced thermal management.
• This material significantly improves heat dissipation and performance in flexible electronic devices like LEDs, batteries, and thermoelectric generators.
• The strategy combining optimized filler interactions and DLP 3D printing offers a new pathway for next-generation flexible electronics.