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Title: Unipolar assembly of zinc oxide rods manifesting polarity-driven collective luminescence
Authors: Gautam, Ujjal K
Imura, Masataka
Rout, Chandra Sekhar
Bando, Yoshio
Fang, Xiaosheng
Dierre, Benjamin
Sakharov, Leonid
Govindaraj, A
Sekiguchi, Takashi
Golberg, Dmitri
Rao, C N R
Keywords: cathodoluminescence
crystal assembly
Issue Date: 3-Aug-2010
Publisher: National Academy Of Sciences
Citation: Proceedings Of The National Academy Of Sciences Of The United States Of America 107(31), 13588-13592 (2010)
Abstract: Oriented assemblies of small crystals forming larger structures are common in nature and crucial for forthcoming technologies as they circumvent the difficulties of structural manipulation at microscopic scale. We have discovered two distinctive concentric assemblies of zinc oxide rods, wherein each rod has an intrinsically positive and a negative polar end induced by the noncentrosymmetric arrangement of Zn and O atoms. All the rods in a single assembly emanate out of a central core maintaining a single polar direction. Due to growth along the two polar surfaces with different atomic arrangements, these assemblies are distinct in their intrinsic properties and exhibit strong UV luminescence in the exterior of Zn-polar assemblies, unlike the O-polar assemblies. Although novel applications can be envisioned, these observations suggest that hierarchical organization with respect to internal asymmetry might be widespread in natural crystal assemblies.
Other Identifiers: 0027-8424
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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