Fig. 3From: In Situ Fabrication of Bi2Ti2O7/TiO2 Heterostructure Submicron Fibers for Enhanced Photocatalytic Activity a TEM image of Bi2Ti2O7/TiO2 composite fiber. b HRTEM image of heterojunction region. c HRTEM image of the nanosheet surface. The inset shows SAED of the single nanosheet. d Elemental line mapping along a radial direction of the Bi2Ti2O7/TiO2 fiber showing Bi (blue), Ti (red), and O (green) and EDX spectrumBack to article page