Low-Temperature Synthesis of ZnO Nanotubes by Supercritical CO2 Fluid Treatment

Abstract

This study applies a novel synthesis method of nanostructure, supercritical CO2 (SCCO2) fluid technology, for ZnO nanotubes growth by oxidation from metal Zn thin film on glass substrate at 60°C. A sputtering Zn film was oxidized by post-treatment of SCCO2 fluid in which 0.3 vol % deionized water was mixed. The images of scanning electron microscopy and transmission electron microscopic indicate that high density nanotubes were formed on the glass substrate. Based on material analyses in this study, ZnO nanotubes with a small diameter (30–50 nm) was formed from metal Zn thin film on a glass substrate by SCCO2 fluid technology.