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Tailored iron-titanium oxide nanostructures Laura H. Lewis, Northeastern University, DMR 0906608

Tailored iron-titanium oxide nanostructures Laura H. Lewis, Northeastern University, DMR 0906608. Impact : Properly engineered , these systems might be used for conversion of sunlight into fuel or as components in spintronic devices based on charge and magnetism control.

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Tailored iron-titanium oxide nanostructures Laura H. Lewis, Northeastern University, DMR 0906608

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  1. Tailored iron-titanium oxide nanostructures Laura H. Lewis, Northeastern University, DMR 0906608 Impact: Properly engineered, these systems might be used for conversion of sunlight into fuel or as components in spintronic devices based on charge and magnetism control. Explanation: Incorporation of small quantities of magnetic elements such as iron into semiconducting titania (TiO2)-based nanostructures can induce magnetism, fostering multifunctionality with simultaneous magnetic, semiconducting and catalytic properties. Outcome: Ordered arrays of titanium oxide nanotubes & hybrid iron-titanium oxide nanotubes have been fabricated and characterized in the context of ferromagnetic semiconductors with potential magnetocatalytic behavior. Ordered arrays of Fe-incorporated titania nanotubes; scanning electron micrographs of (a) top & (b) lateral view. (b) An electrochemical route is used to create these nanostructures, followed by post-processing via annealing up to high temperatures to further tailor their physical and magnetic characteristics. Structural, magnetic and catalytic nature of these systems are then studied and the device applications are being explored.

  2. Tailored structures & magnetism in titania nanotubes Laura H. Lewis, Northeastern University, DMR 0906608 Specific crystallization conditions of titania nanotubes (temperature, heating rate, atmosphere) allow tailoring of the crystal structure, the microstructure and the magnetic character. (a) Image below1: Evidence of enhanced ferromagnetic interactions in annealed titania nanotubes as compared to the as-made nanotubes (annealing temperature: 450 °C). (b) LHS & top image2: Scanning electron micrographs of (a) bottom and (b) lateral side of titania nanotubes, showing a unique geometrical pattern developed during post heat treatment. 1Hosseinpour, P.; Panaitescu, E.; Menon, L.; Heiman, D.; Lewis, L. H., "Magnetic Signature of Structurally Tailored Titania Nanotubes“, Advanced Materials, (2012). in final preparation. 2 Hosseinpour, P.; Panaitescu, E.; Lim, J.; Morris, J.; Lewis, L. H.; Menon, L., " Morphology and Structure of Heat-Treated Titania Nanotubes ", Nanomaterials and Energy: Themed Issue, Photovoltaics, (2012). invited paper.

  3. Enhanced ferromagnetic interactions iniron-incorporated titania nanotubes Laura H. Lewis, Northeastern University, DMR 0906608 Hybrid structures of iron-titanium oxide nanotubes exhibit enhanced ferromagnetism at low temperature that is likely derived from diffusion of Fe into the TiO2 structure. Low temperature ferromagnetic signal observed in iron-incorporated titania nanotubes, as compared to that of pure nanotubes. Evidence of enhanced ferromagnetic interactions in annealed iron-containing titania nanotubes as compared to the as-made nanotubes (annealing temperature: 350 °C).

  4. Nano-Haybales Laura H. Lewis, Northeastern University, DMR 0906608 1American Physics Society citation: This work was highlighted by the American Physics Society, both at the 2012 March Meeting as well as on their webpage (as shown in the image below): • http://www.aps.org/about/physics-images/haybales.cfm • http://www.aps.org/ (April 2012) Nanohaybales, Scanning electron micrograph (falsely colored) of annealed iron-incorporated titania nanotubes.

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