Abstract
Transition metal oxides are celebrated for their novel properties. Just as physical and chemical tuning are at the heart of our ability to design, understand, and control advanced materials in their bulk form, size–shape tuning is of emerging importance in the field of functional oxide nanomaterials. This is because finite length scale effects (1) expand the usable structure–property phase space and (2) can drive emergent phenomena. And in the same way that optical spectroscopy reveals the dynamics of bulk materials, it is beginning to do so in nanoscale compounds, particularly in combination with first principles calculations and various confinement models. This review takes the case study approach, highlighting recent findings in selected transition metal oxides where various types of length scale effects are important. Systems of interest include (1) the Mott–Hubbard compound VO2, (2) La0.5Sr1.5MnO4 in high magnetic field, (3) pristine and chemically substituted vanadium oxide nanoscrolls, (4) quantum size effects in ZnO and TiO2, (5) polar oxide thin films and nanoparticles based upon BiFeO3, and (6) H2 binding in metal-organic frameworks. In these examples, efforts were made to bring simple chemical systems together with appropriate models of insulator-to-metal transitions, confinement, local strain, charge and bonding, excitons, and the role of defects for high level physical understanding of nanoscale texture, strain, and confinement. The overarching goals are to provide perspective for this emerging field and to outline prospects for optical spectroscopy to advance the fundamental understanding of functional oxides.
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Notes
- 1.
In addition to controlling carrier concentration, oxygen vacancies are also related to domain wall pinning, leakage currents, degradation, resistances switching behavior in thin film samples.
- 2.
The general results are clear, with some features sensitive to the growth conditions (and the defect states associated with the surface).
- 3.
The theory of energy gap determination in solids is, of course, well established. The absorption coefficient, α(E), consists of contributions from both the direct and the indirect band gap transitions, the expression for which can be found in any standard optics text [157].
- 4.
Work on hydrogen storage is, of course, directed toward meeting Department of Energy hydrogen storage system targets.
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JLM thanks the Materials Science Division, Basic Energy Sciences, U.S. Department of Energy and the Joint Directed Research and Development Program at the University of Tennessee for support of this work.
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Musfeldt, J.L. (2012). Optical Properties of Nanoscale Transition Metal Oxides. In: Wu, J., Cao, J., Han, WQ., Janotti, A., Kim, HC. (eds) Functional Metal Oxide Nanostructures. Springer Series in Materials Science, vol 149. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9931-3_5
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