Table 2.
Particle sizes of samples S4, S5, S6, S7, and S8 as measured for Fig. 2a–e
| a | b | c | d | e | f | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sample | S4 | S5 | S6 | S7 | S8 | ||||||
| size | 1 | 1 | 2 | 3 | 1 | 2 | 1 | 2 | 1 | 2 | 3 |
| Particle size (μm) | 140±2 | 112±10 | 136±7 | 12.3±0.4 | 24.5±0.8 | 12.0±0.1 | 23±1 | 1.06±0.02 | 5.14±0.09 | 0.83±0.03 | 0.006±0.001 |
In order to calculate the particle sizes, we assumed a cubic symmetry (3D), or in our case, a square (2D) symmetry for the MnO2 particles because our particles exhibit a rutile β-MnO2 crystal structure. The particle sizes tabulated here were given as a side length of a square, and it was calculated as the square root of the particle areas