Fe-incorporated TiO2 nanotube arrays: Electronic structure and magnetic response

Pegah M. Hosseinpour, Félix Jiménez-Villacorta, Jing Liu, Badih A. Assaf, Ian J. McDonald, Dario Arena, Don Heiman, Latika Menon, and Laura H. Lewis
Phys. Rev. B 98, 195145 – Published 30 November 2018

Abstract

Incorporating Fe atoms into the lattice is shown to significantly alter electronic and magnetic properties of TiO2 nanotubes synthesized by electrochemical anodization of Ti-Fe alloy sheets. The effects of Fe incorporation on the nanotube morphology, crystallinity, crystal structure, magnetic behavior and electronic structure were investigated with crystallographic and magnetic probes, including synchrotron-based spectroscopy. Results indicate that the iron cations predominately adopt the Fe3+ configuration, leading to a large increase of the electronic density of states at the Fermi energy. This increase is anticipated to provide enhanced catalytic action, for instance, in the degradation of water and of air pollutants. These results provide insight for tailoring the functionality of these nanostructures for energy-related applications.

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  • Received 11 May 2018

DOI:https://doi.org/10.1103/PhysRevB.98.195145

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pegah M. Hosseinpour1,*, Félix Jiménez-Villacorta1,†, Jing Liu1,2,‡, Badih A. Assaf3,§, Ian J. McDonald1,4, Dario Arena2,¶, Don Heiman3, Latika Menon3, and Laura H. Lewis1,5,**

  • 1Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115
  • 2National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
  • 3Department of Physics, Northeastern University, Boston, Massachusetts 02115
  • 4Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115
  • 5Mechanical and Industrial Engineering Department, Northeastern University, Boston, Massachusetts 02115

  • *Present address: Saint-Gobain Performance Plastics, Taunton, Massachusetts 02780; hossienpour.p@gmail.com.
  • Present address: Consorcio ESS-Bilbao. Parque Tecnológico Bizkaia. Poligono Ugaldeguren III, Pol. A, 7B. 48170 Zamudio, Spain.
  • Present address: Department of Physics, Manhattan College, Riverdale, New York 10471.
  • §Present address: Département de Physique, Ecole Normale Supérieure, PSL Research University, CNRS, 24 rue Lhomond, 75005 Paris, France.
  • Present address: Department of Physics, University of South Florida, Tampa, Florida 33620.
  • **Author to whom correspondence should be addressed: lhlewis@neu.edu

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Issue

Vol. 98, Iss. 19 — 15 November 2018

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