NDLI: Double rare-earth nanothermometer in aqueous media: opening the third optical transparency window to temperature sensing

Content Provider	Royal Society of Chemistry (RSC)
Author	Skripka, A. Canton, P. Hemmer, E. Vetrone, F. Benayas, A. Marin, R.
Copyright Year	2017
Abstract	Owing to the alluring possibility of contactless temperature probing with microscopic spatial resolution, photoluminescence nanothermometry at the nanoscale is rapidly advancing towards its successful application in biomedical sciences. The emergence of near-infrared nanothermometers has paved the way for temperature sensing at the deep tissue level. However, water dispersibility, adequate size at the nanoscale, and the capability to efficiently operate in the second and third biological optical transparency windows are the requirements that still have to be fulfilled in a single nanoprobe. In this work, these requirements are addressed by rare-earth doped nanoparticles with core/shell-architecture, dispersed in water, whose excitation and emission wavelengths conveniently fall within the biological optical transparency windows. Under heating-free 800 nm excitation, double nanothermometry is realized either with Ho3+–Nd3+ (1.18–1.34 μm) or Er3+–Nd3+ (1.55–1.34 μm) NIR emission band ratios, both displaying equal thermal sensitivities around 1.1% °C−1. It is further demonstrated that, along with the interionic energy transfer processes, the thermometric properties of these nanoparticles are also governed by the temperature dependent energy transfer to the surrounding solvent (water) molecules. Overall, this work presents a novel water dispersible double ratiometric nanothermometer operating in the second and third biological optical transparency windows. The temperature dependent particle–solvent interaction is also presented, which is critical for e.g. future in vivo applications.
Starting Page	3079
Ending Page	3085
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	9
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c6nr08472a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NIR Photoluminescence Micrometre Nanothermometry Solvent
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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