基于PS球的银微米结构制备及二次电子发射性能

Fabrication and Secondary electronic emission Property of silver Micro-Structure by PS sphere

摘要:

金属材料的二次电子发射是空间微波部件发生微放电效应的重要机制,微放电效应是航天器有效载荷射频功率增大的限制因素。本文通过在金属银表面构造大尺度聚苯乙烯球阵列制备微米尺度的银膜陷阱结构,实现对二次电子发射的抑制。重点研究了PS微球自组装方法对自组装效果的影响及镀银方式对银膜陷阱结构形貌的影响,并对利用PS微球构造的银膜陷阱结构的二次电子发射性能进行研究。结果表明：蒸发沉积法中的单基片法可有效实现PS微球的自组装,电化学沉积法镀银可获得银膜陷阱结构,且该银膜陷阱结构的二次电子发射系数最大值从2.2降低至1.6。

Abstract:

Secondary electronic emission on metal is the cause of multipactor effect, which is a limition of the space payload RF power increase. In this paper, micrometer-scale trap structure was constructed through large scale pol-ystyrene array to suppress secondary electron emission. PS microspheres self-assembly method are studied, the trap structure are presented, and the secondary emission characteristics are tested. The results showed that the trap structure silver film were prepared based on self-assemble of PS microspheres.Its structure can decreasing the maximum of SEY from 2.2 to 1.6