Synthesis of γ-MnO2 single-crystalline nanobelts

High-quality γ-MnO2 single-crystalline nanobelts have been synthesized by hydrothermal treatment of commercial γ-MnO2 in NaOH aqueous solution. The products are characterized by X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy. The width, thickness and lengths of γ-MnO2 nanobelts are in the range of 80–100 nm, 10–20 nm, and several tens of micrometers, respectively. The influences of the reaction time, temperature, and medium on the morphologies of the resulting products have been investigated.