Electrospun Er3+ -TiO2 nanofibrous films as visible light induced photocatalysts
- Electrospun Er3+ -TiO2 nanofibrous films as visible light induced photocatalysts
- 이득용; 김배연; 조남인; 오영제
- Er3+ doped TiO2; Rare earth; Anatase; Electrospinning; Nanofibers; Photocatalytic activity; Visible light; Catalyst
- Issue Date
- Current applied physics
- VOL 11, NO 5, S324-S327
- Er3+ doped TiO2 nanofibrous films were prepared by a sol-gel derived electrospinning. The 0.5 mol% Er3+
-TiO2 fibers with an average diameter of 160 nm exhibited porous and smooth surface. However, the
fibers became disconnected when the Er concentration was above 1.0 mol%. The anatase peaks of TiO2
became broader and weaker with increasing Er concentration, indicative of reduced grain size and low
extent of crystallinity. Crystallite size determined by the Scherrer formula decreased from 18 to 8 nm
with increasing the amount of Er (0-1.5 mol%). The TiO2 had no absorption in the visible light region
above 400 nm, while the Er3+-TiO2 nanofibers had typical absorption peaks located 490, 523 and
654 nm, corresponding to the transitions from 4I15/2 to 4F7/2, 2H11/2 and 4F9/2, respectively. Smaller
crystallite size of the nanofibers may correspond to larger surface area, which is beneficial for the
photocatalytic activity under visible light.
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