Enhanced visible-light absorption and dopant distribution of iodine-TiO2 nanoparticles synthesized by a new facile two-step hydrothermal method
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In order to prepare visible-light responsive iodine-doped TiO2, a new facile synthetic approach was proposed, which started with the cost-efficient and environmentally friendly precursor of undoped anatase TiO2 to form nanotube structures as templates that collapsed and recrystallized into I-TiO2 nanopowders in HIO3 solution, followed by annealing at different temperatures. The modification of TiO 2 to incorporate iodine and form titanium dioxide with significantly enhanced absorption in the visible range of the spectrum was investigated. The extent of iodine dopant incorporation was determined by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDX) and was found to be homogenously distributed on each nanostructure as determined by electron energy-loss spectroscopy (EELS) elemental mapping and EDX spectroscopy. The modified TiO2 exhibits a dramatically extended absorption edge beyond 800 nm as compared to the original and unmodified TiO2. © 2011 Elsevier Inc. All rights reserved.
author list (cited authors)
Hong, X., Luo, Z., & Batteas, J. D.