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Figure 3: TEM images of nanofibers and microparticles after calcination process. Pristine TiO2 nanofibers in low magnification (a), the HRTEM images of the former figure (b). The low magnification images of the TiO2 nanofibers containing Ni NPs (c), the HR-TEM images of the corresponding former figure. The low magnification images of the TiO2 microparticles containing Ni NPs (e), the HR-TEM images of the corresponding figure (f).