journal article·2015-12-08

Polarization-Dependent Raman Spectroscopy of Epitaxial TiO2(B) Thin Films

Jacob R. Jokisaari, Dylan Bayerl, Kui Zhang, Lin Xie, Yuefeng Nie, Darrell G. Schlom, Emmanouil Kioupakis, George W. Graham, Xiaoqing Pan

Chemistry of Materials· Volume 27· Issue 23
Publisher page

Abstract

The bronze polymorph of titanium dioxide, known as TiO 2 (B), has promising photochemical and electronic properties for potential applications in Li-ion batteries, photocatalysis, chemical sensing, and solar cells. In contrast to previous studies performed with powder samples, which often suffer from impurities and lattice water, here we report Raman spectra from highly crystalline TiO 2 (B) films epitaxially grown on Si substrates with a thin SrTiO 3 buffer layer. The reduced background from the Si substrate significantly benefits acquisition of polarization-dependent Raman spectra collected from the high-quality thin films, which are compared to nanopowder results reported in the literature. The experimental spectra were compared with density functional theory calculations to analyze the atomic displacements associated with each Raman-active vibrational mode. These results provide a standard reference for further investigation of the crystallinity, structure, composition, and properties of TiO 2 (B) materials with Raman spectroscopy.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Semiconductor materials and devices · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States

Department of Chemical Engineering and Materials Science, University of California—Irvine, Irvine, California 92697, United States

National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, P. R. China

Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States

Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States

Department of Physics and Astronomy, University of California—Irvine, Irvine, California 92697, United States

Funding

Basic Energy Sciences · Office of Science · Office of the President, University of Michigan · Office of the Provost, University of Michigan · Division of Materials Research · Division of Chemical, Bioengineering, Environmental, and Transport Systems

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