Laser action in ZnO nanoneedles selectively grown on silicon and plastic substrates

Lau, S. P.; Yang, H. Y.; Yu, S. F.; Li, H. D.; Tanemura, M.; Okita, T.; Hatano, H.; Hng, H. H.
July 2005
Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p013104
Academic Journal
An ion-beam technique has been employed to fabricate nanoscale needlelike structures in ZnO thin films on silicon and plastic substrates at room temperature. The ZnO nanoneedles showed a single-crystalline wurtzite structure, the stem of which was around 100 nm in diameter. The sharp tips of the nanoneedles exhibited an apex angle of 20° as measured by transmission electron microscopy. Room-temperature ultraviolet random lasing action was observed in the ZnO nanoneedle arrays under 355 nm optical excitation.


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