resumo
While a continuous monitoring of temperature at the micro-and nano-scales is clearly of interest in many contexts, in many others a yes or no answer to the question did the system locally exceed a certain temperature threshold?'' can be more accurate and useful. This is the case of hard-to-detect events, such as those where temperature fluctuations above a defined threshold are shorter than the typical integration time of micro/nanothermometers and systems where fluctuations are rare events in a wide time frame. Herein we present the synthesis of iron selenide magnetic nanoplatelets and their use as non-volatile logic gates recording the near infrared (NIR) dose that triggers a temperature increase above a critical temperature around 42 degrees C in prostate cancer cell cultures. This use is based on the bistable behavior shown by the nanoplatelets below a magnetic phase transition at a tunable temperature TC and on their photothermal response under NIR light. The obtained results indicate that the synthesized nanomagnets may be employed in the future as both local heaters and temperature monitoring tools in a wide range of contexts involving systems which, as cells, are temperature-sensitive around the tunable T-C.
palavras-chave
IRON; FE3SE4; PHASE
categoria
Chemistry; Materials Science
autores
Silva, RO; Pereira, RA; Silva, FM; Gaspar, VM; Ibarra, A; Millan, A; Sousa, FL; Mano, JF; Silva, NJO
nossos autores
Fábio Martins Silva
Estudante de doutoramento
Filipa Lourosa Sousa
Investigador Júnior
João Mano
Vice-Diretor
Nuno João Silva
Investigador Principal
Rui Pedro Oliveira Silva
Bolseiro de pós-Doutoramento
Rute A. Pereira
Estudante de doutoramento
Vítor Gaspar
Professor AuxiliarGrupos
G1 - Materiais Porosos e Nanossistemas
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
G5 - Materiais Biomiméticos, Biológicos e Vivos
Projectos
agradecimentos
We thank Manuel Martins for fruitful discussions during the early stages of this work. We acknowledge J. Linden for kindly providing us with the reference Fe