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Raman mapping and SEM images of particle-assembled β-Fe2O3 films excited by a 0.4 mW laser at 785 nm after irradiation by a 10 mW laser with various wavelengths: (a-c) 532 nm, (d-f) 633 nm and (g-i) 785 nm. (a, d, g) α-Fe2O3; (b, e, h) β-Fe2O3.
