Time resolved spectroscopy of infrared emitting Ag2S nanocrystals for subcutaneous thermometry

We report a systematic investigation on the temperature dependence of fluorescence decay dynamics of infrared emitting colloidal Ag 2 S nanocrystals (NCs) with different surface coatings. The drastic lifetime reduction in the biological temperature range (20-50 °C) makes Ag 2 S NCs outstanding candi...

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Bibliographic Details
Published in:Nanoscale 2017-02, Vol.9 (7), p.255-2513
Main Authors: Santos, H. D. A, Ruiz, D, Lifante, G, Jacinto, C, Juarez, B. H, Jaque, D
Format: Article
Language:English
Subjects:
Computer simulation
Dynamical systems
Nanocrystals
Nanostructure
Reduction
Sensitivity
Temperature dependence
Time resolved
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Summary:We report a systematic investigation on the temperature dependence of fluorescence decay dynamics of infrared emitting colloidal Ag 2 S nanocrystals (NCs) with different surface coatings. The drastic lifetime reduction in the biological temperature range (20-50 °C) makes Ag 2 S NCs outstanding candidates for high sensitivity subcutaneous lifetime-based thermal sensing in the second biological window (1000-1400 nm). Indeed, the lifetime thermal sensitivity of Ag 2 S NCs has been found to be as large as 3-4% °C −1 at an operating wavelength of 1250 nm. Their application for lifetime-based luminescence nanothermometry has been demonstrated through simple ex vivo experiments specially designed to elucidate the magnitude of subcutaneous thermal gradients. Experimental data were found to be in excellent agreement with numerical simulations. Ag 2 S nanocrystals emerge as high sensitivity lifetime based fluorescent nanothermometers.
ISSN:2040-3364
2040-3372
DOI:10.1039/c6nr08534b