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When a Zn wire was heated by electric current, ZnO whiskers grew on the wire surface. The average diameters of the whiskers grown under O 2 , 20% O 2 and Ar atmospheres were 0.12, 0.17 and 0.4 μm, respectively. The well-known visible emission was observed from the whiskers grown under O 2 and 20% O 2 atmospheres. The whiskers grown under Ar atmosphere showed strong...