Journal
NANO LETTERS
Volume 9, Issue 5, Pages 1926-1931Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl900075f
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Funding
- National and Jiangsu Natural Science Foundations [BK2006715, BK2008020, BK60676056, BK10874071]
- National Basic Research Programs of China [2007CB936300, 2006CB921803]
- Hong Kong Research Grants Council (RGC) [CityU 112307]
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Vacancy structures in tin oxide nanoribbons fabricated via thermal evaporation and post-processing are probed by luminescence spectroscopy, and interesting properties that bode well for oxygen sensing are observed. Besides a broad 620-nm band, the fabricated tin oxide nanoribbons show a photoluminescence band at 480 nm when the measurement temperature is <100 K. The blue band appears from nanoribbons synthesized under high oxygen pressure or annealed under oxygen. The dependence suggests that the oxygen interstitial and vacancy densities determine the electronic states that produce the blue band. Calculation of the electron structures based on the density functional theory shows that decreased oxygen vacancies or increased oxygen interstitials enhance the 480-nm band but suppress the 620-nm band. The results reported here indicate that the tin oxide nanoribbons with vacancy structures have potential applications in luminescence-sensitive oxygen sensing.
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