Coaxial electrospinning fabrication of core-shell energetic fibers and in-situ integration with SCB exhibiting superior non-contact ignition

Electrospinning has exhibited great potential in the fabrication of fibrous energetic materials for the past few years. Herein, the core–shell energetic fibers (defined as CSEF) were designed and fabricated through the coaxial electrospinning. The core stratum was Al/MoO3-PVDF and the shell stratum was CL-20-NC. The morphologies of CSEF performed a clear core–shell structure, and the constituent analyses demonstrated that the components did not change after the preparation. According to the relative content of CL-20, the samples were defined as CSEF0C, CSEF10C, CSEF30C and CSEF50C respectively. The clear core–shell structure of CSEF was confirmed through the morphologies. The total heat releases of CSEF were not affected by the variation of the content of CL-20 nearly, and the existence of CL-20 improved the thermal stability of Al/PVDF. The combustion propagation velocity of CSEF increased by the increase of CL-20 from 0.241 m/s (CSEF0C) to 0.664 m/s (CSEF50C). In addition, CL-20 decreased the ignition temperature and delay time of CSEF. The combustion products analyses demonstrated that CL-20 promoted the combustion performance of CSEF by leading to less sintering of the reactants. Furthermore, CSEF50C films were fabricated and deposited onto a semiconductor bridge (SCB) in-situ (defined as CSEF50C-SCB). CSEF50C-SCB possessed larger flame and longer combustion duration, which displayed an excellent clearance ignition ability. The superior combustion performance of CSEF films assembled with SCB in-situ would exhibit the admirable application prospects for practice when combined the Micro-electromechanical systems (MEMS).