Temperature Dependence of Water Absorption in the Biological Windows and Its Impact on the Performance of Ag2S Luminescent Nanothermometers - Archive ouverte HAL Access content directly
Journal Articles Particle & Particle Systems Characterization Year : 2022

Temperature Dependence of Water Absorption in the Biological Windows and Its Impact on the Performance of Ag2S Luminescent Nanothermometers

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Tamara Muñoz-Ortiz
Riccardo Marin
Jie Hu
Dirk Ortgies
Antonio Benayas
Florence Gazeau
Victor Castaing
Bruno Viana
Daniel Jaque
Emma Martín Rodríguez
José García Solé

Abstract

The application of nanoparticles in the biological context generally requires their dispersion in aqueous media. In this sense, luminescent nanoparticles are an excellent choice for minimally invasive imaging and local tempera-ture sensing (nanothermometry). For these applications, nanoparticles must operate in the physiological temperature range (25–50 °C) but also in the near-infrared spectral range (750–1800 nm), which comprises the three biological windows of maximal tissue transparency to photons. In this range, water displays several absorption bands that can strongly affect the optical proper-ties of the nanoparticles. Therefore, a full understanding of the temperature dependence of water absorption in biological windows is of paramount importance for applications based on these optical properties. Herein, the absorption spectrum of water in the biological windows over the 25–65 °C temperature range is systematically analyzed, and its temperature dependence considering the coexistence of two states of water is interpreted. Additionally, to illustrate the importance of state-of-the-art applications, the effects of the absorption of water on the emission spectrum of Ag2S nanoparticles, the most sensitive luminescent nanothermometers for in vivo applications to date, are presented. The spectral shape of the nanoparticles’ emission is drastically affected by the water absorption, impacting their thermometric performance.
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Dates and versions

hal-03805075 , version 1 (21-11-2022)

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Tamara Muñoz-Ortiz, Lise Abiven, Riccardo Marin, Jie Hu, Dirk Ortgies, et al.. Temperature Dependence of Water Absorption in the Biological Windows and Its Impact on the Performance of Ag2S Luminescent Nanothermometers. Particle & Particle Systems Characterization, 2022, pp.2200100. ⟨10.1002/ppsc.20220010⟩. ⟨hal-03805075⟩
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