Abstract
We present the UV photodetection properties and the field emission properties of ZnO single-crystal microtubes synthesized using a microwave-heating growth method. The ZnO microtubes exhibited relatively fast UV photoresponse with a cut-off wavelength ∼ 370 nm, indicating their potential application as UV detectors with high efficiency and low cost. The turn-on voltage for the as-grown and post-annealed ZnO microtube samples were 5.6 V/μ m and 6.4 V/μ m, respectively. The emission current density reached about 11 mA/cm 2 for the as-grown sample at an applied field of 20 V/μ m, and 12.5 mA/cm 2 for the post-annealed sample at an applied field of 13 V/μ m. Due to its relative large tip area (in comparison with ZnO nanomaterials) of the ZnO microtube, the intrinsic field emission enhancement factor β of the ZnO microtube was relatively low; however, the experimental β values were quite high, indicating strong field emission characteristics of the ZnO microtubes.
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