We develop a micro-gap electrode device on quartz substrate to investigate the dielectric breakdown resistance on constrained layer of silica/epoxy interface. After application of stress, the device is cut at the middle of the micro-gap by laser dicing to observe the cross-section, and the cross-section shows where the breakdown occurs in the vicinity of the silica/epoxy interface at sub-micron scale. These results give us a clue to understand the effect of nano-fillers on the dielectric breakdown of nano-composite materials.
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