Research On Silicon-based Cu?N₃?₂@CNTs Composite Films Applied In Energetic Chips

As a low-toxic,high-energy primer,copper azide?Cu?N₃?₂?has good application potential,but its relatively high sensitivity limits its practical application.As a kind of one-dimensional nanomaterials,carbon nanotubes?CNTs?have excellent electrical conductivity,heat transfer and mechanical performances.Constraining copper azide in the hollow lumen of aligned carbon nanotubes can effectively reduce the electrostatic sensitivity..Besides,the excellent mechanical strength and uniform opening direction of the nanotubes can greatly improve the safety of the copper azide reaction and ensure the maximum output of detonation energy.In this paper,a porous alumina film?PAM?was first prepared on a silicon substrate by anodization,and then a carbon nanotube array was prepared by chemical vapor deposition?CVD?in a PAM-regulated cell..Copper nanoparticles were deposited in the lumen of CNTs by electrochemical deposition.Finally,silicon-based Cu?N₃?₂@CNTs composite energetic films were prepared by gas-solid phase azidation reaction,and the properties of the films were studied.The main research work of this paper is as follows:?1?Ti and Al films were sequentially deposited on a silicon substrate by electron beam evaporation technique.The modified two-step anodization method and reaming treatment were used to prepare porous alumina membrances on Ti/Si substrates.The influences of process conditions on the regularity and size of the pore structure are studied.The optimum preparation conditions were as follows:temperature was 1-3°C;from 0V to 100V?oxidation voltage?at a rate of 0.5V·s^-1;stirring speed was 430r/min;electrolyte solvent was ethanol:water?v/v?=1:1;the first step of the oxidizing electrolyte is 0.3M oxalic acid solution,the oxidation time is 40min;the second step oxidizing electrolyte is 0.5wt%phosphoric acid solution,and the current drop is about 0.04mA/cm².The prepared porous alumina film has no barrier layer and has a thickness of about 1.2?m,and a pore diameter of about 150nm;?2?Using the self-catalysis of PAM,an oriented carbon nanotube array was prepared in the PAM channel by CVD.Electrochemical deposition was used to deposit copper nanoparticles in the hollow lumen of carbon nanotubes.The effects of electrolyte additives and deposition temperature on the deposition density of copper nanoparticles were investigated.The results show that the deposition density of copper nanoparticles is the highest with thiourea as the electrolyte additive at 35°C.After the silicon-based Cu@CNTs composite film was placed in the air for 24 hours,most of the nano-copper deposited in the carbon nanotubes was oxidized to nano-copper oxide.?3?The Cu₂O@CNTs composite film was subjected to azide reaction for 72h.The characterization results show that most of the cuprous oxide in the carbon nanotubes changed into networked cuprous azide.The Cu@CNTs composite film was subjected to azidation reaction for 72h.The characterization results show that all the copper nanoparticles in the carbon nanotubes were converted into flocyanous copper azide.The calculation results of activation energy show that the activation energy of Cu?N₃?₂@CNTs composite films is 229.998kJ/mol.?4?The electrostatic sensitivity,laser ignition and electric blast experiment of silicon-based Cu?N₃?₂@CNTs composite energetic film were studied.The effects of retention and removal of PAM on the performance of composite energetic film were investigated.The results show that the PAM-retaining film has lower electrostatic sensitivity than the PAM-removed film,and the PAM-removed film has better laser ignition performance and electric blasting performance than the PAM-retaining film.