Cupric coordination polymers template enable rapid synthesis of copper azide film for micro-initiation systems

Micro-initiation systems based on copper azide (CA) demonstrate considerable potential in energetic devices due to their advantages in miniaturization and integration. However, conventional in situ CA synthesis methods encounter significant bottlenecks, including long reaction time ranging from hours to days, limited precursor diversity and low operation safety. This study pioneers the use of coordination polymers (CPs) as precursors to overcome these challenges. By utilizing the acid-sensitive properties of CPs, we develop a transformation strategy from Cu-CP to CA in an aqueous hydrazoic acid solution, achieving minute-level in situ synthesis of CA. Cu-CP films are fabricated on patterned stainless steel using a classical liquid-liquid interfacial synthesis method, followed by a liquid-solid azidation reaction to produce CA films, thereby validating their applicability for micro-detonator systems. This strategy not only remarkably reduces the time required for the in situ synthesis of CA, but also leverages the diversity and microfabricability advantages of CPs materials, offering a novel solution to flexible design, facile synthesis and safe implementation of azide compounds in micro-initiation systems.