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Upconversion nanoparticle-decorated gold nanoshells for near-infrared induced heating and thermometry

Abstract : The present work involves the design of a multifunctional system based on gold nanoshells (AuNSs) decorated with lanthanide-based upconversion nanoparticles (UCNPs) intended as an optical heater and a temperature probe at the nanoscale. The synthesis of NaGdF4 UCNPs doped with ions Yb3+:Er3+ was performed via thermal decomposition of lanthanide fluoride precursors at high temperatures (>300 °C) in the presence of a coordinating ligand (oleic acid). UCNPs were synthesized at three different temperatures (310, 315 and 320 °C) and characterized in terms of morphological, structural and emission properties. In view of the intended biological applications, the surface of hydrophobic oleate-capped UCNPs was modified using a silica coating to achieve sufficient water dispersibility, through a modified Stöber process using a reverse micro-emulsion method. Monodisperse NaGdF4:Yb3+:Er3+ upconversion nanocrystals (∼25 nm dia.) were obtained in cubic (at 310, 315 °C) and hexagonal (at 320 °C) phases. The UCNPs in the hexagonal phase were shown to be more suitable as temperature sensors, due to their lower red-to-green emission ratios and higher thermal sensitivities. The emission spectrum of NaGdF4:Yb3+:Er3+ (oleate- or silica-coated) UCNPs was recorded at different temperatures in the vicinity of the physiological range (20–70 °C) and presented suitable properties for application as temperature sensors, such as excellent linearity (r2 > 0.99) and sensitivity (>3 × 10−3 K−1). The heating capacity of AuNSs@UCNPs was verified by monitoring the Er3+ emission, showing their potential for application as a hyperthermia agent controlled using a nanothermometer function.
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https://hal-utt.archives-ouvertes.fr/hal-02472964
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Submitted on : Monday, February 10, 2020 - 2:36:30 PM
Last modification on : Monday, July 20, 2020 - 1:06:06 PM

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Karina Nigoghossian, Samuel Ouellet, Jerome Plain, Younes Messaddeq, Denis Boudreau, et al.. Upconversion nanoparticle-decorated gold nanoshells for near-infrared induced heating and thermometry. Journal of materials chemistry‎ B, Royal Society of Chemistry, 2017, 5 (34), pp.7109-7117. ⟨10.1039/C7TB01621B⟩. ⟨hal-02472964⟩

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