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Title: Boosting the sensitivity of Nd3+-based luminescent nanothermometers
Author: Balabhadra, Sangeetha
Debasu, Mengistie L
Brites, Carlos D S
Nunes, Luis A O
Malta, Oscar L
Rocha, Joao
Bettinelli, Marco
Carlos, Luis D
Issue Date: 2015
Publisher: Royal Society of Chemistry
Abstract: Luminescence thermal sensing and deep-tissue imaging using nanomaterials operating within the first biological window (ca. 700–980 nm) are of great interest, prompted by the ever-growing demands in the fields of nanotechnology and nanomedicine. Here, we show that (Gd1−xNdx)2O3 (x = 0.009, 0.024 and 0.049) nanorods exhibit one of the highest thermal sensitivity and temperature uncertainty reported so far (1.75 ± 0.04% K−1 and 0.14 ± 0.05 K, respectively) for a nanothermometer operating in the first transparent near infrared window at temperatures in the physiological range. This sensitivity value is achieved using a common R928 photomultiplier tube that allows defining the thermometric parameter as the integrated intensity ratio between the 4F5/2 → 4I9/2 and 4F3/2 → 4I9/2 transitions (with an energy difference between the barycentres of the two transitions >1000 cm−1). Moreover, the measured sensitivity is one order of magnitude higher than the values reported so far for Nd3+-based nanothermometers enlarging, therefore, the potential of using Nd3+ ions in luminescence thermal sensing and deep-tissue imaging.
Peer review: yes
DOI: 10.1039/c5nr05631d
ISSN: 2040-3372
Appears in Collections:CICECO - Artigos

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