Synthesis of Unidirectional Alumina Nanostructures without Added Organic Solvents

Alumina nanotubes, nanofibers, and nanorods were synthesized through a new method based on a surfactant-driven hydrothermal process, but without adding any organic solvent. Our procedure provides a single-step, low-temperature route to different alumina nanostructures with thermal stability by varying the nature of surfactants.