Author, as appears in the article.: Nexha A; Carvajal J; Pujol M; Díaz F; Aguiló M
Department: Química Física i Inorgànica
URV's Author/s: Aguiló Díaz, Magdalena / Carvajal Martí, Joan Josep / Díaz González, Francisco Manuel / Nexha, Albenc / Pujol Baiges, Maria Cinta
Keywords: Thermometers Therapy Nanoshells Nanorods Nanoparticles Klu(wo4)(2) Graphene Conversion efficiency Absorption Ablation
Abstract: © 2020 The Royal Society of Chemistry. KLu1-x-yHoxTmy(WO4)2 nanocrystals with different atomic concentrations (x = 0.01, 0.03, 0.05, 0.075, 0.1, 0.15 and y = 0.05, 0.1, 0.2) were synthesized via the modified sol-gel Pechini method, using ethylenediaminetetraacetic acid as the chelating agent, and polyethyleneglycol as the esterification agent. Different doping levels were implemented with the goal to determine the optimal ratio for maximizing the intensity of their optical emission in the short-wavelength infrared (SWIR) region, their thermal sensitivity as luminescent thermometers and the photothermal conversion efficiency to act as photothermal agents. The obtained KLu1-x-yHoxTmy(WO4)2 nanocrystals exhibit a monoclinic structure and an irregular shape, with a size of around 150 nm. The photoluminescence spectrum in the SWIR region of the obtained nanocrystals, excited at 808 nm, shows three main bands attributed to the electronic transitions: 3H4 → 3F4 (1.45 μm) and 3F4 → 3H6 (1.8 μm) of Tm3+ and 5I7 → 5I8 (1.96 μm) of Ho3+. The temperature dependency of the three emission bands was recorded in the physiological range of temperatures from 293 K to 333 K, displaying a relative thermal sensitivity (Srel) of 0.90% K-1 at 293 K for the doping level of 1 at% Ho3+ and 10 at% Tm3+, representing the highest reported up to now in the SWIR region. The photothermal conversion efficiency (η) of the KLu1-x-yHoxTmy(WO4)2 nanocrystals is 40 ± 2% for the same doping levels, being competitive with other photothermal agents reported before, like metallic and semiconductor nanocrystals. The simultaneous ability of these nanocrystals to combine photothermal conversion efficiency and thermal sensing in the SWIR is demonstrated through an ex vivo experiment.
Thematic Areas: Química Physics, applied Odontología Materials science, multidisciplinary Materials chemistry Materiais Interdisciplinar General chemistry Engenharias iii Ciências ambientais Ciências agrárias i Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 20507526
Author's mail: joanjosep.carvajal@urv.cat magdalena.aguilo@urv.cat mariacinta.pujol@urv.cat f.diaz@urv.cat
Author identifier: 0000-0002-4389-7298 0000-0001-6130-9579 0000-0002-1052-8031 0000-0003-4581-4967
Last page: 191
Record's date: 2024-10-19
Journal volume: 8
Papper version: info:eu-repo/semantics/submittedVersion
Link to the original source: https://pubs.rsc.org/en/content/articlelanding/2020/tc/c9tc04228h#!divAbstract
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Journal Of Materials Chemistry c. 8 (1): 180-191
APA: Nexha A; Carvajal J; Pujol M; Díaz F; Aguiló M (2020). Short-wavelength infrared self-assessed photothermal agents based on Ho,Tm:KLu(WO4)2 nanocrystals operating in the third biological window (1.45-1.96 μm wavelength range). Journal Of Materials Chemistry c, 8(1), 180-191. DOI: 10.1039/c9tc04228h
Article's DOI: 10.1039/c9tc04228h
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
First page: 180
Publication Type: Journal Publications
Repositori URV