Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 250, Issue -, Pages 147-155Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.04.160
Keywords
Lanthanides; Nanothermometers; Neodymium; Biological windows; Colloids
Funding
- University of Verona, Italy
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de recherche du Quebec Nature et technologies (FRQNT)
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Strontium fluoride nanoparticles activated with Nd3+ ions were studied as nanosized optical thermometers in the first (800-950 nm) and second (1000-1300nm) biological windows, by monitoring the Nd3+ emission as a function of the temperature. The variations of the Nd3+ emissions were correlated with the temperature changes and the thermometric properties of SrF2 nanoparticles were evaluated using a ratiometric method. The best thermal sensitivity was found to be 0.60% K-1, a value which is the highest found for water dispersible colloidal nanothermometers based on the near-infrared luminescence of Nd3+ ions only in single phase materials. The excellent thermometric performance is also demonstrated by a thermal sensitivity of 1.2 degrees C, that can be achieved in temperature evaluation of real systems. Temperature measurements using a phantom tissue confirmed that the samples serve as efficient ratiometric nanothermometers that can work in two biological windows. (C) 2017 Elsevier B.V. All rights reserved.
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