Formation mechanism and photoluminescence of necklace-like In_2O_3 nanowires

摘要

Necklace-like In_2O_3 nanowires, which consist of In_2O_3 crystals (beads) and nanowires (thread), demonstrated by a simple thermal method. The shape of bead crystals based on an {lll}-octahedron, of which vertices are truncated with {100} facets. According to the growth direction of the nanowires, the truncated octahedron has two different shapes; i.e., symmetric one on <100>-nanowires and asymmetric one on -nanowires. It is shown that the growth of the bead crystals is determined by anisotropy of the growth rates of low-index facets related to their surface energy and an epitaxial relationship between the bead crystals and nanowires. Their formation mechanism and photoluminescence are discussed.