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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/88836


    Title: Electron Enrichment in 3d Transition Metal Oxide Hetero-Nanostructures
    Authors: Kronawitter, Coleman X.;Bakke, Jonathan R.;Wheeler, Damon A.;Wang, Wei-Cheng;Chang, Chinglin;Antoun, Bonnie R.;Zhang, Jin Z.;Guo, Jinghua;Bent, Stacey F.;Mao, Samuel S.;Vayssieres, Lionel
    Contributors: 淡江大學物理學系
    Keywords: Carrier dynamics;electronic structure;interfacial charge transfer;nanostructure;oxide heterostructure
    Date: 2011
    Issue Date: 2013-04-29 10:27:40 (UTC+8)
    Publisher: Washington, DC: American Chemical Society
    Abstract: Direct experimental observation of spontaneous electron enrichment of metal d orbitals in a new transition metal oxide heterostructure with nanoscale dimensionality is reported. Aqueous chemical synthesis and vapor phase deposition are combined to fabricate oriented arrays of high-interfacial-area hetero-nanostructures comprised of titanium oxide and iron oxide nanomaterials. Synchrotron-based soft X-ray spectroscopy techniques with high spectral resolution are utilized to directly probe the titanium and oxygen orbital character of the interfacial region’s occupied and unoccupied densities of states. These data demonstrate the interface to possess electrons in Ti 3d bands and an emergent degree of orbital hybridization that is absent in parent oxide reference crystals. The carrier dynamics of the hetero-nanostructures are studied by ultrafast transient absorption spectroscopy, which reveals the presence of a dense manifold of states, the relaxations from which exhibit multiple exponential decays whose magnitudes depend on their energetic positions within the electronic structure.
    Relation: Nano Letters 11 (9), pp3855-3861
    DOI: 10.1021/nl201944h
    Appears in Collections:[物理學系暨研究所] 期刊論文

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