Cathodoluminescence defect characterization of hydrothermally grown Sn O2 nanoparticles

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Instituto de Física, Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Puebla 72570, Mexico [1 ]
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Journal of Applied Physics | 2008年 / 103卷 / 06期
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Sn O2 nanoparticles in the 50-150 nm size range were grown by a low temperature hydrothermal process; using Sn Cl4 5 H2 O as precursor and C H3 (C H2)15 N (Br) (C H3)3 as stabilizing agent. The as-grown samples were mostly amorphous and their crystallinity improved either by prolonged hydrothermal process or by air annealing at high temperatures. The absence of near-band-edge emission and appearance of a broad visible emission related mainly to oxygen vacancies and crystalline defects were the main characteristics of their room temperature cathodoluminescence (CL) spectra. A luminescent band in the 1.79-1.83 eV spectral region was also detected. The intensity of the defect bands reduces both on prolonged hydrothermal treatment and air annealing at high temperatures; indicating a net decrease of defect content on thermal treatments. Panchromatic CL images revealed that most of the defect emissions come from smaller Sn O2 nanoparticles. © 2008 American Institute of Physics;
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