abstract
Thermal sensing at the nanoscale is an attracted research field with potential applications in disparate areas from micro/nanoelectronics to nanomedicine. One of the driving forces of the research in the area is the design and fabrication of ratiometric thermometers combining materials with distinct thermometric properties. In this work, we provide an example of the combination of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (TPFPP) and colloidal ZnS/AOT quantum dots (QDs) as luminescent ratiometric thermal sensors acting within the physiological temperature range. Taking advantage of the overlap of the absorption band of the porphyrin with the emission band of the prepared colloidal ZnS/AOT QDs, the non-covalent nanoassemblies prepared presented ratiometric temperature sensing based on the so-called inner filter effect (or radiative energy transfer). In fact, the emission band of ZnS/AOT QDs at 411 nm is more pronounced by the absorbance of TPFPP. As an optical temperature sensor the TPFPP-ZnS/AOT QDs nanoassemblies showed good temperature reversibility, with a maximum relative thermal sensitivity of 0.95% & DEG;C-1 at 50 & DEG;C.
keywords
SENSITIVE DETECTION; NANOPARTICLES; NANOCRYSTALS; FLUORESCENCE; THERMOMETRY; COMPLEXES; ALDER; CO
subject category
Engineering; Instruments & Instrumentation
authors
Conceicao, P; Barata, JFB; Hernandez-Rodriguez, MA; Lacerda, PSS; Neves, MGPMS; Carlos, LD; Trindade, T
our authors
Joana Filipa Brites Barata
Post-doc Fellowship
Luís Carlos
Full professor
Miguel Andrés Hernández Rodríguez
Junior Researcher
Paula Sofia Sarrico Lacerda
Researcher
Tito Trindade
Full professorGroups
G1 - Porous Materials and Nanosystems
G2 - Photonic, Electronic and Magnetic Materials
G4 - Renewable Materials and Circular Economy
Projects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Corrole based systems for luminescent thermometry at nanoscale (CORLUTNA)
acknowledgements
Thanks are due to University of Aveiro and FCT/MCTES for the financial support to CESAM (UIDP/50017/2020 + UIDB/50017/2020 + LA/P/0094/2020) , CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020) and LAQV-REQUIMTE (UIDB/50006/2020) through national funds and, where applicable, co-financed by the FEDER, within the PT2020 Partnership Agreement, and to the Portuguese NMR Network, which partially supports the NMR spectrometers by Infrastructure Project No 022161 (co-financed by FEDER through COMPETE 2020, POCI and PORL and FCT through PIDDAC) . This work was also financially supported by the project Corlutna (POCI-01-0145-FEDER-031523 and PTDC/QUI-ORG/031523/2017) funded by FEDER, through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) , and by national funds (OE) , through FCT/MCTES. Pedro Conceicao and Paula S. S. Lacerda also thank project Corlutna for his grant BI/UI88/9085/2020 and her research contract, respectively.