Study On Synthesis, Characterization And Properties Of Al/CuO Nanowires Based On Nanoenergetic Composites

In the dissertation, CuO nanowires were successfully synthesized by thermal annealing of copper thin films which deposited by electron beam current on silicon substrate. The effects of different parameters, namely, electron beam current, film thickness, annealing temperature and annealing time on the fabrication of the CuO nanowires were investigated by FE-SEM, and on the average length, diameter and density of CuO nanowires. It is found that nanowires can only be formed at 400℃, whereas the diameter and density of nanowires depend critically on the electron beam current. The average diameter and density of nanowires can mostly be improved by increasing the electron beam current. It is observed that the annealing time has an important effect on the length and density of nanowires, while the average diameter keeps constant. In summary, the electron beam current, film thickness, annealing temperature, and annealing time would be set to 0.15 A,1μm,400℃, and 4 h, respectively, in order to get uniform and large-area nanowires.EDS, XRD, TEM and SAED were applied to analyze the structure of nanowires. The results showed that Cu and O can only be found for nanowires by EDS, that Cu2O and CuO are the only formation by XRD. The nanowires is single crystalline whose diffraction pattern is indexed with lattice parameters for CuO by SAED. Different from the vapor-liquid-solid (VLS) and vapor-solid (VS) mechanism, the growth of nanowires is found to be based on the accumulation and relaxation of the stress.The CuO nanowires cores were served as templates for the depositon of Al shells by subsequent magnetron sputtering to get the CuO/Al core/shell nanowires. It features only a single exothermic reaction and the exothermic onset temperature is below the melting temperature of Al (660℃). The 50% ignition energy and ignition energy density were 33 mJ and 42.04 mJ·mm-2 by the testing, respectively. The electrical explosion experiments of the composite bridge film were implemented which the triggering vltage keeps constant at 80 V and the results showed that delay time was 12.6μs accompanying with duration of 1.5ms.