GeO_2 nanotubes and nanorods synthesized by vapor phase reactions

摘要

Bulk-quantity GeO_2 nanorods and nanotubes have been synthesized by simple thermal evaporation of metallic germanium powders. The nanorods and nanotubes have a diameter of about 100-150 nm and length of about 1 urn. Many of the nanotubes have a serrated out surface which is formed by twin crystals. The twin boundary can strengthen the mechanical property and increase the electrical resistance and thus vary the physical property of GeO_2 The products can emit bright blue light with a peak at 448 nm under excitation at 381 nm at room temperature. So the products may have potential application in future integrated optical devices.