| Copper azide?Cu?N3?2?is an ideal primary explosive with low toxicity and high energy.However,due to extreme electrostatic sensitivity,copper azide does not have many practical applications in the miniaturized pyrotechnics.Carbon nanotubes?CNTs?have excellent electrical conductivity and mechanical strength.Compounding Cu?N3?2 with CNTs can effectively tame the electrostatic sensitivity of Cu?N3?2 and can availably enhance the safety and detonation energy.An embedded copper azide carbon nanotube composite film based on silicon substrate was designed and prepared in this paper.A aligned CNTs/alumina composite membranes on a Si wafer were obtained by sputtering,anodization and chemical vapor deposition successively..The effects of spttering power,pore-widening time,oxidation voltage and Ti layer on PAM were also investigated,as well as the deposition time,obtaining the optimum conditions for preparation of membranes.The outer diameter of the CNTs is about 90nm and the length is about 700nm,corresponding to the size of the PAM channel.The adhesion between PAM and the Si wafer increases significantly with Ti layer.Moreover,the selective deposition of CNTs indicates that y-alumina has a catalytic activity to the formation of CNTs;Cu nanoparticles?Cu-NPs?were electrodeposited into aligned CNTs.The influence of current density,additives and deposition time to the deposition effect has been analyzed.Transmission electron microscopy?TEM?pictures show that the size and density of Cu-NPs are affected by current density;bis-?sodium sulphopropyl?-disulphide?SPS?and thiourea?TU?play an obvious role in improving the density of Cu-NPs in CNTs,especially TU.Under the optimal conditions of deposition?0.1mA,TU?,Cu-NPs with small particle size and appropriate density were achieved;Cu?N3?2@CNTs composite film material were prepared in situ by gas-solid reaction of HN3 and Cu.The effects of reagents and time on azide efficiency of Cu were also investigated.The efficiency of the reaction with water participation was higher than without.X-ray diffraction?XRD?spectrums show Cu?N3?2 is obtained by the reaction of cuprous azide?CuN3?.When the duration of reaction is 72h,Cu transforms into cuprous azide?CuN3?completely.The performance of Cu?N3?2@CNTs composite film material were analyzed,including electrostatic sensitivity,thermal behavior and laser ignition.The results shows that Cu?N3?2@CNTs composite film material is insensitive to static electricity,and has good laser ignition sensitivity.The temperature of the exothermic peak is 210.95?,and heat discharge is 3742J·g-1. |
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