Low-Temperature Solution Synthesis of Zinc Oxide Nanotubes

Zinc oxide nanotubes (ZnO-NTs) have been successfully synthesized at ∼60°C using wet chemical method. ZnO-NTs have diameters of 100–200 nm and lengths of 1–2 μm. Transmission electron microscopy shows that as-synthesized NTs are single-crystal hexagonal structure and grown along [0001] direction. X-ray diffraction, ultravisible absorption, and photoluminescence results reveal that thermal treatments at low temperature of <500°C in air cannot apparently improve the crystal properties of as-synthesized ZnO.