Abstract
ZnO nanowires were grown on Si(001) substrates by catalyst-free thermal evaporation of ZnO powders in a lateral quartz tube without using a carrier gas. In the first phase of the vapour deposition process, film-like structures were formed on the substrate surface in three-dimensional island growth mode and then rod-like nanostructures nucleated at the vertices of these ZnO islands. The rod-like structures grew further into slender needle-like structures that finally evolved into straight hexagonal prismatic ZnO nanowires having c-axis oriented single-crystalline wurtzite structure. Morphological evolution of the ZnO nanostructures accompanied improvement in the crystal qualities as reflected in the emission characteristics investigated by photoluminescence (PL) spectroscopy, where intensified near-band-edge (NBE) emission was observed as compared with previously reported cases.
Original language | English |
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Pages (from-to) | 1441-1445 |
Number of pages | 5 |
Journal | Nanotechnology |
Volume | 15 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2004 Nov |
All Science Journal Classification (ASJC) codes
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering