Electrospinning Device for Nanofibers| Low Dielectric and High Thermal Conductive Phononic CrystalNanofiber MetamaterialFilm

Professor Yan Jianhua from Donghua University: Phononic Crystal Nanofiber Metamaterial Films with Low Dielectric Constant and High Thermal Conductivity

Challenge: The rapid development of 3D heterogeneous integration technology imposes stringent requirements on the thermal conductivity of low-dielectric materials. However, common low-dielectric materials typically exhibit low thermal conductivity, hindering simultaneous optimization of signal transmission and heat dissipation in integrated systems.

Approach: Professor Yan Jianhua from Donghua University successfully prepared a phononic crystal nanofiber (NF) metamaterial film composed of boron nitride nanosheets (BNNS) and polyimide (PI) crystal bridges through precise control of synthesis parameters.

Innovation 1: The crystalline PI bridging structure and BNNS collaboratively form a phononic crystal-like metamaterial within the fibers, enhancing lattice vibrations and promoting heat transfer. Meanwhile, the PI surrounding the fibers maintains a long-range disordered structure, hindering dipole alignment.

Innovation 2: This synergistic effect enables the phononic crystal NF film to achieve both high thermal conductivity up to 6.51 W/(m·K) and relatively low dielectric constant of 2.63, thereby improving the energy efficiency of 3D integrated systems.

https://doi.org/10.1002/adma.202502146