Zinc oxide single-crystal microtubes

Jiping Cheng; Ruyan Guo; Qing-Ming Wang
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5140
Academic Journal
ZnO single-crystal microtubes were fabricated using an encapsulated microwave growth method. The ZnO crystals are grown in hexagonal hollow tube form with a well faceted end and side surfaces, which have cross-sectional dimensions of 100 to 250 μm, lengths of 3–5 mm, and wall thickness of 1–2 μm. Under optical excitation, a strong near-band-edge emission was obtained at a peak wavelength of 377.8 nm with a full width at half maximum of 11 nm. The ZnO microtubes exhibited a highly selective UV light response with a cut-off wavelength at ∼370 nm, and excellent electron field emission properties with an emission current density of 11 mA/cm2 at an applied field of ∼20 V/μm.


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