Nanodefects are probable root causes for the observed high power dissipation of ZnO-based surge suppression devices (SSDs). In this work, nanodefects are introduced by overgrinding ZnO for 100 hours via wet milling. Using FESEM, ZnO nanostructures are found to contain fine cracks, chipped-off surfaces and nanofragments. For the defective ZnO, the zinc relative atomic % (EDS analysis) is observed to be much larger accompanied by higher oxygen vacancy concentration as revealed by PL green emission. Average particle size drops from 0.24 μm to 0.19 μm and specific surface area increases from 4.72m2/g to 5.67m2/g. Fabricated SSDs with defective ZnO exhibits higher power dissipation and bigger grain resistivity. A model is proposed to provide a correlation between nanodefects and power dissipation. Copyright © 2006 Taylor & Francis Group, LLC.
|Journal||Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry|
|Publication status||Published - 2006|