Construction of high-performance azide films with Macro size appropriate for the micro-initiator

Micro-nano energetic materials generally have advantages such as high reactivity and high energy density due to their special micro-nano structure, but the macroscopic construction of micro-nano energetic materials is the biggest bottleneck hindering their development. In this paper, a layer-by-layer superposition method combining electrospinning and electrospray is proposed. Metal salt microspheres are embedded into nanofibers, and a three-dimensional azide film (3D CA@C and 3D LA@C) is obtained through high-temperature calcination and in situ azide process. Because azide microspheres are evenly dispersed in the carbon skeleton with good thermal and electrical conductivity, and are limited by the frame structure, they are not susceptible to external stimuli, so as to have better sensitivity performance. The electrostatic sensitivity of 3D CA@C increased from 0.05 mJ to 2.72 mJ of raw material, and the flame sensitivity of 3D LA@C increased from 8 cm to 31 cm of raw material. At the same time, the 3D azide films can still maintain good initiation performance and meet the actual initiation requirements. This work gives full play to the advantages of energetic materials with micro-nano structure, and at the same time realizes the construction of macroscopic size of materials. While maintaining its micro-nano characteristics, the film obtained can be easily processed, which is more in line with the requirements of the MEMS process. This provides the latest idea and experience for the preparation of micro and nano energetic materials at the macro scale.