Preparation Of Core/Shell Nano Structure Co₃O₄/Al Membrane And Its Application On Semiconductor Bridge

Three dimensionally ordered macroporous (3 DOM) and three dimensionally netty Co3O4 membranes were prepared by colloidal crystal template method, and Al was then deposited by magnetron sputtering to form core/shell structure nanothermite membranes. SEM, TEM, XRD and DSC were used to characterize the morphology, phase and energy release of these two kinds of core/shell structure nanothermite membranes. Then, three dimensionally ordered core/shell Co3O4/Al structure nanothermite membrane was integrated on semiconductor bridge (SCB) to form Co3O4/Al reactive SCB. The electrical explosion performance was researched by high speed storage oscilloscope and high speed camera under capacity discharge pattern. The main conclusions were as follows.(1) The molarity of precursor plays an important role in the morphology of 3 DOM Co3O4 membrane. When molarity of Co(NO3)2 is 1.5mol/L, the prepared Co3O4 presents a whole and long-range ordered 3DOM skeleton. Al was then coated on the Co3O4 uniformly by magnetron spurting, which ensures Al and Co3O4 to integrate compactly in nanoscale and effectively increases the contact area. With the aluminizing time increasing, the coated Al layer on the Co3O4 wall is getting thicker. At the optimized aluminizing time of 20 min, energy release reaches a maximum of 1823.9J/g.(2) Co(Ac)2-4H2O was selected as the Co source, and oxalic acid was used to synthesize preformed precipitate to prepare netty Co3O4 membranes. Thin and disordered Co3O4 nanorods interweave into a netty skeleton, and form connecting three dimensionally structure. Because of the limited space and the obstruction of disorder nanorods, the energy release of three dimensionally netty core/shell structure Co3O4/Al nanothermite membrane is generally inferior to the three dimensionally ordered one. When aluminizing time is 10 min, the total energy release achieves its maximum,1274.7J/g.(3) Compared to traditional polycrystalline silicon SCB, the explosion time and the explosion energy required in Co3O4/Al reactive SCB had no significant difference. Because nanothermite was lighted by high temperature plasmas, the height of the flame get higher, the ignition duration get longer. It can be definitely concluded that the integrating of Co3O4/Al nanothermite was beneficial to improve the ignition ability especially the reliability of gap ignition. When the excitation voltage increased, Co3O4/Al reactive SCB presented better ignition performance due to the fact that more nanothermite membrane was ignited.