Pinned Low-Energy Electronic Excitation in Metal-Exchanged Vanadium Oxide Nanoscrolls

We measured the optical properties of mixed valent vanadium oxide nanoscrolls and their metal-exchanged derivatives in order to investigate the charge dynamics in these compounds. In contrast to the prediction of a metallic state for the metal-exchanged derivatives within a rigid band model, we find...

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Bibliographic Details
Published in:Nano letters 2007-08, Vol.7 (8), p.2351-2355
Main Authors: Cao, J, Musfeldt, J. L, Mazumdar, S, Chernova, N. A, Whittingham, M. S
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Crystallization - methods
Electron Transport
Energy Transfer
Exact sciences and technology
Macromolecular Substances - chemistry
Manganese - chemistry
Materials science
Materials Testing
Metals - chemistry
Molecular Conformation
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - methods
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Particle Size
Physics
Surface Properties
Vanadium Compounds - chemistry
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Summary:We measured the optical properties of mixed valent vanadium oxide nanoscrolls and their metal-exchanged derivatives in order to investigate the charge dynamics in these compounds. In contrast to the prediction of a metallic state for the metal-exchanged derivatives within a rigid band model, we find that the injected charges in Mn2+-exchanged vanadium oxide nanoscrolls are pinned. A low-energy electronic excitation associated with the pinned carriers appears in the far infrared and persists at low temperature, suggesting that the nanoscrolls are weak metals in their bulk form, dominated by inhomogeneous charge disproportionation and Madelung energy effects.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl071002l