In-situ synthesis of an integrated CuN3/CL-20 explosive train film with excellent initiation ability

• A novel CuN 3 /CL-20 explosive train film is fabricated in-situ on a Cu substrate. • High-energy explosive is embedded within porous CuN 3 film via spin-coating. • This explosive train film exhibits controllable energy release. • The enhanced initiation ability and violent explosive flame are validated. In-situ construction of energetics-on-a-chip by the microcharge technique has recently received much attention by researchers. In this study, a novel integrated CuN 3 /CL-20 explosive train film was fabricated in-situ on a Cu substrate. The porous CuN 3 film, which was synthesized by facile electrochemical azidation of porous Cu, served as a skeleton for the integration of CL-20 by means of spin-coating and recrystallization. In this architecture, the introduction of CL-20 endowed the resultant explosive train film with a greater charge density and an enhanced energy output than a single CuN 3 film. In particular, the tunability of exothermic capacity could be controlled by adjusting the loading amount of CL-20. Additionally, the embedded CL-20 and CuN 3 film jointly ensured violent explosive behavior upon laser stimulation. Given these advantages, this CuN 3 /CL-20 explosive train film exhibits great potential for application in functional energetic chips.