Enhanced visible-light absorption and dopant distribution of iodine-TiO{sub 2} nanoparticles synthesized by a new facile two-step hydrothermal method

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.06.012· OSTI ID:21580201

Hong Xiaoting, E-mail: [e-mail] ^[1]; Luo Zhiping, E-mail: [e-mail] ^[2]; Batteas, James D., E-mail: [e-mail] ^[3]

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1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006 (China)
2. Microscopy and Imaging Center, Texas A and M University, College Station, TX 77843 (United States)
3. Department of Chemistry, Texas A and M University, College Station, TX 77842 (United States)

In order to prepare visible-light responsive iodine-doped TiO{sub 2}, a new facile synthetic approach was proposed, which started with the cost-efficient and environmentally friendly precursor of undoped anatase TiO{sub 2} to form nanotube structures as templates that collapsed and recrystallized into I-TiO{sub 2} nanopowders in HIO{sub 3} solution, followed by annealing at different temperatures. The modification of TiO{sub 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 TiO{sub 2} exhibits a dramatically extended absorption edge beyond 800 nm as compared to the original and unmodified TiO{sub 2}. - Graphical abstract: As-synthesized I-TiO{sub 2} nanoparticles show significantly enhanced visible-light absorption, with the dopant iodine homogenously dispersed on each I-TiO{sub 2} nanostructure based on EELS elemental mapping. Highlights: > Iodine-TiO{sub 2} nanoparticles by a new facile two-step hydrothermal method. > Significantly enhanced light absorption in the visible range of the spectrum. > Homogenous dopant distribution within each nanostructure.

• OSTI ID: 21580201
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 8; Other Information: DOI: 10.1016/j.jssc.2011.06.012; PII: S0022-4596(11)00323-9; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
DISTRIBUTION
DOPED MATERIALS
ENERGY-LOSS SPECTROSCOPY
HYDROTHERMAL SYNTHESIS
IODINE
NANOTUBES
PARTICLES
TITANIUM OXIDES
VISIBLE RADIATION
X RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
HALOGENS
IONIZING RADIATIONS
MATERIALS
NANOSTRUCTURES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
SORPTION
SPECTROSCOPY
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS