Article ID Journal Published Year Pages File Type
1621845 Journal of Alloys and Compounds 2009 4 Pages PDF
Abstract
High-quality rutile SnO2 nanowires were fabricated by a vapor-phase transport and condensation method assisted by carbothermal reduction. The composition and structure were investigated in detail. It is found that many oxygen vacancies exist in the single-crystalline rutile SnO2 nanowires and can further influence the photoluminescence (PL) and dielectric property of the nanowires. The PL spectrum only exhibits a wide yellow emission centered at 570 nm and usual near band edge emission is not observed, which is ascribed to a large amount of ionized oxygen vacancies. The dielectric measurements indicate that the dielectric response of the SnO2 nanowires is significantly enhanced in the low-frequency range. It is thought both the rotation direction polarization (RDP) and the space charge polarization (SCP) process induced by O vacancies and nanosize effects are the main reasons for the enhancement of relative dielectric constant (ɛr) of these SnO2 nanowires.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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