Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202207524
Keywords
copper azides; core-shell structures; laser initiation; MOF@COF hybrids; primary explosives
Categories
Funding
- National Natural Science Foundation of China [21825106, 21901234, 22175155]
- Henan Science Fund for Excellent Young Scholars [212300410084]
- opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology) [KFJJ22-05M]
- Open Fund of Defense Science and Technology Laboratory [6142602190303]
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In this study, a highly efficient laser-ignitable primary explosive was prepared by constructing a core-shell hetero-framework. The explosive showed lower laser energy thresholds and higher detonation ability compared to traditional metal complex-based primary explosives. The study also demonstrated successful laser initiation and detonation of secondary explosives. This research provides a unique method for constructing high-performance laser-ignitable primary explosives for micro-detonator applications.
Laser initiation has attracted increasing interest owing to its extraordinary safety and high reliability. However, traditional metal complex-based laser-ignitable primary explosives are limited by high input laser energy and low detonation ability. In this study, an efficient laser-ignitable primary explosive-based copper azide is prepared by constructing core-shell hetero-framework Cu-MOF@COF as the precursor. The pyrolysis of Cu-MOF@COF hybrid material affords copper azide (CA) nanoparticle confined in a porous carbon shell, referred to CA@C Shell. The evenly coated porous carbon shell functions as light-to-heat conversion layer efficiently promoting the laser initiation process of inside CA. Consequently, CA@C Shell can be initiated at lower laser energy thresholds (0.80 mJ at 1064 nm). This value is significantly lower than typical laser ignitable metal complex tetraamine-cis-bis(5-nitro-2H-tetrazolato-N-2)cobalt(III)perchlorate (726 mJ at 808 nm). Moreover, the CA@C Shell successfully detonates the secondary explosives CL-20 by laser energy when it is assembled in a micro-detonator system. This study offers a unique method for constructing high performance laser-ignitable primary explosives for micro-detonator applications.
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