resumo
Nd3+-doped nanoparticles have recently emerged as very attractive multifunctional systems with potential for simultaneous bio-imaging and thermal sensing, due to near-infrared excitation and emission within the first (700-980 nm)and second (1000-1400 nm)biological windows. However, while these nanoparticles have been already used for thermal sensing in the first biological window very few studies concern the second biological window. Here, we show that upon 808 nm excitation a thermometer consisting of (Gd1-xNdx)(2)O-3(x=0.020, 0.028and 0.064)nanospheres exhibits a thermal sensitivity of 0.23 +/- 0.03% K-1 at 303 K, operating in the second transparent near infrared biological window. This sensitivity value is achieved by defining the thermometric parameter as the ratio between the integrated intensity of all the transitions originated from the (4)F(3/2)highest-energy Stark component and all the transitions from the (4)F(3/2)lowest-energy. (C) 2016 Elsevier B.V. All rights reserved.
palavras-chave
2ND BIOLOGICAL WINDOW; CARBON NANOTUBES; ENERGY-TRANSFER; DRUG-DELIVERY; FLUORESCENCE; TEMPERATURE; SENSITIVITY; NM; NANOTHERMOMETERS; NANOCRYSTALS
categoria
Optics
autores
Balabhadra, S; Debasu, ML; Brites, CDS; Rocha, J; Carlos, LD
nossos autores
Carlos Brites
Professor associado
João Rocha
Prof. Catedrático
Luís Carlos
Professor Catedrático
Mengistie Leweyehu Debasu
Investigador
Sangeetha Balabhadra
Bolseiro de investigaçãoProjectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
LUMINET - European Network on Luminescent Materials (LUMINET)
agradecimentos
This work was developed in the scope of the project CICECO - Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. Financial support of EC Marie Curie Initial Training Network LUMINET (316906) and EU COST - CM1403 action are also acknowledged. CDSB (SFRH/BPD/89003/2012) and MLD (SFRH/BPD/93884/2013) thank Fundacao para a Ciencia e Tecnologia (Portugal) for the post-doctoral grants.