Lab Electrospinning System| Low Dielectric and High Thermal Conductive Phononic CrystalNanofiber MetamaterialFilm

Advanced Materials (IF 27.4): Phononic Crystal Nanofiber Metamaterial Thin 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 the simultaneous optimization of signal transmission and heat dissipation in integrated systems.

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

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

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

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