Abstract
Large-scale nanoblades were synthesized by a low-temperature hydrothermal process. The growth rate and degree of crystallinity of the nanoblades were found to increase with decreasing growth temperature. An intense blue photoluminescence (PL) centered at was observed in all the as-synthesized nanoblades. As the growth temperature was decreased from to 80 and , the PL peak intensity of the nanoblades decreased by about 29 and 41%, respectively. Meanwhile, the PL peak intensity would reduce by about 42% and enhance by about 23%, respectively, after oxygen and vacuum annealing at for . The zero-crossing value in the electron paramagnetic resonance spectra was calculated to be 2.0019, implying that there exist many singly ionized oxygen vacancies in our nanoblades. The blue luminescence from nanoblades can be attributed to the possible recombinations of electrons on singly ionized oxygen vacancies or conduction band and holes on the valence band, tin-oxygen vacancy centers, or doubly ionized oxygen vacancies.
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