Figure 1
From: Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Microstructural observation results for α-MnO2 nanowires.
(a), SEM image, (b), TEM image, (c), rough surface under TEM and (d), HRTEM image of a single nanowire with inset SAED pattern. The images of the microstructure indicate that α-MnO2 nanowires grow in the [0 0 1] direction and the rough surfaces are parallel to the (2 1 0) planes. The diameter of the nanowires is ~20 nm and the length ~1 μm.