Construction Of Silver Trap Structures By Template Method And Its Application In Multipactor Suppression

Multipactor is one kind of resonance vacuum discharge phenomenon occurred on the surface of high-power microwave component. The surface secondary electron emission of components is a critical factor leading to multipactor breakdown. The most commonly used method to reduce the surface SEY of components is to construct a roughness structure on the surface of the components.In this research, the construction of silver trap structures on the surface of silver plated aluminum was proposed utilizing Zn O nanoarrays and self-assembled PS microspheres as the template, respectively. With the desire neither to destroy its structure nor to prejudice its performance of the component, the generated secondary electrons could be captured and then absorbed in the constructed silver trap structures. And the purpose to reduce the surface SEY of the components together with suppressing the multipactor could be achieved, at last.(1) Zn O nanoarrays were fabricated on the surface of silver plated aluminum via seeded growth. Scanning electron microscopy(SEM) was used to characterize the morphology of Zn O nanoarrays. X-ray diffraction(XRD) and energy dispersive spectroscopy(EDS) were used to characterize the structure and composition of the nano Zn O. Results proved the successful control of the density of the prepared Zn O nanoarrays by adjusting the reaction conditions. And the Zn O nanoarrays had a preferred orientation along(002) direction with the element ratio of Zn to O close to 1:1. Afterwards, silver film was prepared by electrochemical deposition utilizing the obtained Zn O nanoarrays as the template. And then the silver trap structures were realized using 0.001mol/L dilute hydrochloric acid to etch out the Zn O template. SEM was used to characterize the morphology of the silver film and the silver trap structures. XRD, EDS and transmission electron microscopy(TEM) were used to characterize the structure and composition of the obtained nano materials. And the SEY of the constructed silver trap structures was investigated to characterize its secondary electron emission properties. Results proved the successful construction of silver trap structures and the deposited silver had a preferred orientation along(111) direction. Through process optimization, the final silve trap structures showed a SEY less than 1.0, which exhibited an excellent SEY suppression.(2) By examining the self-assembly methods, vapor deposition mothod with singal substrate was selected to self-assemble PS microspheres on the surface of silver plated aluminum. SEM was used to characterize the morphology of the PS microspheres self-assembly and results proved the successful control of the layer of the PS microspheres self-assembly by adjusting the experimental conditions. Afterwards, silver film was prepared by electrochemical deposition utilizing the obtained PS microspheres self-assembly as the template. And then the silver trap structures were realized using tetrahydrofuran to swell and remove the PS microspheres template. SEM was used to characterize the morphology of the siver film and silver trap structures, and SEY was investigated to characterize the secondary electron emission properties of the obtained silver trap structures. Results showed that the SEY of the sample was still large, more than 1.6, due to the missed construction of ideal chamber-like silver trap structures, which needed a further optimization of the construction process of the silver trap structures...