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Raman mapping and SEM images of particle-assembled β-Fe2O3 films excited by a 0.4 mW laser of 785 nm after the irradiation of 785 nm laser with various power: (a-c) 40 mW, (d-f) 20 mW, (g-i) 10 mW, (j-l) 4 mW and (m-o) 0.4 mW. (a, d, g, j, m) α-Fe2O3; (b, e, h, k, n) β-Fe2O3.
