Cathodoluminescence defect characterization of hydrothermally grown SnO2 nanoparticles

U. Pal, A. Pérez-Centeno, M. Herrera-Zaldívar
2008 Journal of Applied Physics  
SnO 2 nanoparticles in the 50-150 nm size range were grown by a low temperature hydrothermal process, using SnCl 4 ·5H 2 O as precursor and CH 3 ͑CH 2 ͒ 15 N͑Br͒͑CH 3 ͒ 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
more » ... e main characteristics of their room temperature cathodoluminescence ͑CL͒ 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 SnO 2 nanoparticles.
doi:10.1063/1.2885060 fatcat:ylljzs2wuja5vembyckb7qmw2i