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/μm and 6.4 V/μm, respectively. The emission current density reached about 11 mA/cm2 for the as-grown sample at an applied field of 20 V/μm, and 12.5 mA/cm2 for the post-annealed sample at an applied field of 13 V/μm. 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 68-75 |
| Number of pages | 8 |
| Journal | Ferroelectrics |
| Volume | 382 |
| Issue number | 1 PART 3 |
| DOIs | |
| State | Published - 2009 |
| Event | 6th Asian Meeting on Ferroelectrics, AMF-6 - Taipei, Taiwan, Province of China Duration: Aug 2 2008 → Aug 6 2008 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics