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. 2016 Jan 6;6:18978. doi: 10.1038/srep18978

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(a) phase-pure SnO₂, (b) Co/SnO₂ and (c) Co-N/SnO₂ nanocrystals. The prominent peaks of three samples can be easily identified as the tetragonal phase of SnO₂ (JCPDS card no.01-0657).