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- W2007473577 abstract "The electronic structure of three-dimensional nanostructures (aerogels) is studied by soft x-ray absorption near-edge structure (XANES) spectroscopy. High-resolution O -edge and Sn - and -edge XANES spectra of monolithic nanocrystalline rutile aerogels with different surface areas (i.e., different surface-to-volume atom fractions) are compared with spectra of full-density rutile and tetragonal SnO. Spectra are interpreted based on the electronic densities of states in calculated with both cluster (self-consistent real-space multiple scattering) and band-structure (linear muffin-tin orbital) methods. Results show that, in contrast to the currently widely accepted picture, the presence of undercoordinated surface atoms not only affects the Fermi level position but also changes the structure of the conduction band by introducing additional Sn-related electronic states close to the conduction band minimum. These additional states are due to oxygen deficiency and are attributed to a surface reconstruction of nanoparticles forming the aerogel skeleton. Results of this study are important for understanding the physical processes underlying the performance of gas sensors based on nanostructures." @default.
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- W2007473577 date "2005-07-01" @default.
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- W2007473577 title "Surface electronic states in three-dimensional SnO2 nanostructures" @default.
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- W2007473577 doi "https://doi.org/10.1103/physrevb.72.035404" @default.
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