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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. C 2011, 115, 23, 11420-11426
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Electronic Structure and Photoluminescence Origin of Single-Crystalline Germanium Oxide Nanowires with Green Light Emission

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† Institute of Functional Nano and Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, P. R. China
‡ Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P. R. China
*E-mail: [email protected] (X.S.), [email protected] (Z.J.).
Cite this: J. Phys. Chem. C 2011, 115, 23, 11420–11426
Publication Date (Web):May 20, 2011
https://doi.org/10.1021/jp201884y
Copyright © 2011 American Chemical Society
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Abstract

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High-quality single-crystalline germanium oxide nanowires (GeONWs) have been synthesized by a thermal evaporation method under a vapor–liquid–solid mechanism. The morphology and nanostructure of the as-synthesized GeONWs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) of the GeONWs showed the presence of substoichiometric oxygen. The electronic structure and local structure of GeONWs were also investigated by X-ray absorption fine structure (XAFS), which showed disorder and degradation of long-range order in the nanowires due to the nanosize in one-dimension and oxygen vacancies in the nanowires. Synchrotron-radiation-based X-ray-excited optical luminescence (XEOL) from GeONWs exhibits strong green light at 2.3 eV (540 nm), which corresponds to the photoluminescence (PL) spectrum of the individual GeONWs excited by laser. The strong emission is attributed to oxygen-related defect states in oxygen vacancies confirmed by X-ray absorption near-edge structure (XANES) and XEOL.

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  14. Azade Esmaeili-Bafghi-Karimabad, Laya Nejati-Moghadam, Sousan Gholamrezaei, Masoud Salavati-Niasari. Photoluminescence, photocatalytic and solar cell behaviors of as-prepared Germania nanoparticles from a sol–gel route. Journal of Materials Science: Materials in Electronics 2015, 26 (8) , 5822-5832. https://doi.org/10.1007/s10854-015-3142-9
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  20. Morteza Javadi, Zhenyu Yang, Jonathan G. C. Veinot. Surfactant-free synthesis of GeO 2 nanocrystals with controlled morphologies. Chem. Commun. 2014, 50 (46) , 6101-6104. https://doi.org/10.1039/C4CC01490A
  21. Lorenzo Mino, Giovanni Agostini, Elisa Borfecchia, Diego Gianolio, Andrea Piovano, Erik Gallo, Carlo Lamberti. Low-dimensional systems investigated by x-ray absorption spectroscopy: a selection of 2D, 1D and 0D cases. Journal of Physics D: Applied Physics 2013, 46 (42) , 423001. https://doi.org/10.1088/0022-3727/46/42/423001
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