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 Ag2S nanocrystals (NCs) with different surface coatings. The drastic lifetime reduction in the biological temperature range (20-50 °C) makes Ag2S 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 Ag2S NCs has been found to be as large as 3-4% °C-1at 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.
Grupo de Fotônica e Fluidos Complexos, Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil. cjacinto@fis.ufal.br.
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Santos
IMDEA Nanoscience, Faraday 9, Campus Cantoblanco, 28049, Madrid, Spain.
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D
Ruiz
Fluorescence Imaging Group, Departamento de Fisica de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain. daniel.jaque@uam.es.
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Lifante
Grupo de Fotônica e Fluidos Complexos, Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil. cjacinto@fis.ufal.br.
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http://orcid.org/0000-0002-1101-7196
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Jacinto
IMDEA Nanoscience, Faraday 9, Campus Cantoblanco, 28049, Madrid, Spain and Applied Physical-Chemistry Department, Faculty of Science, Universidad Autónoma de Madrid, Madrid 28049, Spain.
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Juarez
Fluorescence Imaging Group, Departamento de Fisica de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain. daniel.jaque@uam.es.
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http://orcid.org/0000-0002-3225-0667
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Jaque