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Optical Sensing and Imaging of Trace Oxygen with Record Response


  • We thank Petra Suchomel (preparation of organosilicas), Dr. Jürgen Baier (singlet oxygen measurements), and Dr. Edith Schnell (AFM) of the University of Regensburg. This work was partially supported by the Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR (Germany), by the Fundação para a Ciência e a Tecnologia (FCT, Portugal), and POCI 2010 (POCI/QUI/58535/2004). C.B. was supported by a postdoctoral fellowship from FCT (SFRH/BPD/14561/2003).


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Ultratrace quantities of oxygen can be determined at single spots as well as spatially resolved, and over a temperature range of more than 100 K, by exploiting the extremely efficient quenching of the delayed fluorescence of the fullerene C70 incorporated into matrices of organosilica or ethyl cellulose.

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