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(a,b) EDX mapping images; (c,d) HRTEM images with FFT and IFFT analyses indicate the existence of the (101) plane of anatase TiO2; (e,f) FFT of the purple/blue rectangle of the zoomed-in area shows an amorphous coating (TiO2) or hematite nanoparticles of size 6–8 nm in the (104) plane of α-Fe2O3 (TiO2@2%Fe2O3).
