A facile template-free route to synthesize porous ZnO nanosheets with high surface area

摘要

Microporous and mesoporous ZnO nanosheets were successfully synthesized by a low-temperature chemical bath deposition and subsequently thermal decomposition at 250 °C without any templates. Nanosheet-shaped zinc hydroxide nitrate (Zn_3(OH)_4(NO_3)_2) was formed as the precursors at 90 °C for 6 days by chemical bath deposition in a close system. Microporous and mesoporous ZnO nanosheets were obtained from the removing of OH and NO_3 groups from zinc hydroxide nitrate (Zn_3(OH)_4(NO_3)_2) nanosheet-shaped precursors. The pore sizes were distributed in the region of ~1.3-25 nm with a center at ~2.4 nm. Such porous and nanosheets structure gave a highest specific surface area of 283.8 m~2/g.