α-MnO2 nanowires were synthesized via a low-temperature hydrothermal route.
Controllable nanowires could be obtained by heating at a range from 150 °C to 750 °C.
The nanowires were 20–75 nm in diameter and 150 nm–1.2 μm in length.
Hydrothermal-synthesized α-MnO2 show well thermal-stability even heated at 900 °C.