Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry

Autor(es)

Lima, Karmel de Oliveira ^[1] ; dos Santos, Luiz Fernando ^[1] ; Galvao, Rodrigo ^[2] ; Tedesco, Antonio Claudio ^[3] ; Menezes, Leonardo de Souza ^{[2, 4]} ; Goncalves, Rogeria Rocha ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lab Mat Luminescentes Micro & Nanoestruturados Ma, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto - Brazil

^[2] Univ Fed Pernambuco, Dept Fis, Recife, PE - Brazil

^[3] Univ Sao Paulo, Ctr Nanotechnol & Tissue Engn, Photobiol & Photomed Res Grp, Dept Chem Fac Philosophy Sci & Letters Ribeirao P, Ribeirao Preto - Brazil

^[4] Ludwig Maximilians Univ Munchen, Nanoinst Munich, Fac Phys, Munich - Germany

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN CHEMISTRY; v. 9, JUL 21 2021.
• Citações Web of Science: 0

Resumo

Among several optical non-contact thermometry methods, luminescence thermometry is the most versatile approach. Lanthanide-based luminescence nanothermometers may exploit not only downshifting, but also upconversion (UC) mechanisms. UC-based nanothermometers are interesting for biological applications: they efficiently convert near-infrared radiation to visible light, allowing local temperatures to be determined through spectroscopic investigation. Here, we have synthesized highly crystalline Er3+, Yb3+ co-doped upconverting KGd3F10 nanoparticles (NPs) by the EDTA-assisted hydrothermal method. We characterized the structure and morphology of the obtained NPs by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and dynamic light scattering. Nonlinear spectroscopic studies with the Er3+, Yb3+: KGd3F10 powder showed intense green and red emissions under excitation at 980 and 1,550 nm. Two- and three-photon processes were attributed to the UC mechanisms under excitation at 980 and 1,550 nm. Strong NIR emission centered at 1,530 nm occurred under low 980-nm power densities. Single NPs presented strong green and red emissions under continuous wave excitation at 975.5 nm, so we evaluated their use as primary nanothermometers by employing the Luminescence Intensity Ratio technique. We determined the temperature felt by the dried NPs by integrating the intensity ratio between the thermally coupled H-2(11/2)-> I-4(15/2) and S-4(3/2)-> I-4(15/2) levels of Er3+ ions in the colloidal phase and at the single NP level. The best thermal sensitivity of a single Er3+, Yb3+: KGd3F10 NP was 1.17% at the single NP level for the dry state at 300 K, indicating potential application of this material as accurate nanothermometer in the thermal range of biological interest. To the best of our knowledge, this is the first promising thermometry based on single KGd3F10 particles, with potential use as biomarkers in the NIR-II region. (AU)

• Processo FAPESP: 20/05319-9 - Plataformas multifuncionais a base de materiais nanoestruturados luminescentes dopados com íons lantanídeos com potencial aplicação em fotônica e teranóstica
• Beneficiário: Rogéria Rocha Gonçalves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/11301-2 - Materiais luminescentes micro e nanoestruturados dopados com terras raras: propriedades e aplicações
• Beneficiário: Rogéria Rocha Gonçalves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/10440-9 - Luminescência no visível e infravermelho próximo em partículas nanoestruturadas de Y2O3 dopadas com íons lantanídeos para aplicação em sistemas biológicos
• Beneficiário: Luiz Fernando dos Santos
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 18/18213-4 - Síntese de nanomateriais luminescentes multifuncionais à base de fluoretos e óxidos dopados com íons terras raras para aplicação em Teranóstica
• Beneficiário: Karmel de Oliveira Lima
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado