Article
Multidisciplinary Sciences
Xiangjun Di, Dejiang Wang, Qian Peter Su, Yongtao Liu, Jiayan Liao, Mahnaz Maddahfar, Jiajia Zhou, Dayong Jin
Summary: This study developed a new nanothermometry method to monitor the thermal dynamics of lysosomes and mitochondria in cells. The results showed that the temperatures of lysosomes and mitochondria changed under different conditions, indicating different metabolic pathways and thermal transitions between them. This nanothermometry method can be used for high-resolution subcellular functional imaging.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Nanoscience & Nanotechnology
Thomas P. van Swieten, Tijn van Omme, Dave J. van den Heuvel, Sander J. W. Vonk, Ronald G. Spruit, Florian Meirer, H. Hugo Perez Garza, Bert M. Weckhuysen, Andries Meijerink, Freddy T. Rabouw, Robin G. Geitenbeek
Summary: This study demonstrates high spatial resolution nanothermometry at elevated temperatures using chemically stable upconversion nanoparticles and confocal microscopy. Distortions in the luminescence spectra, intrinsic to samples with nanoscale photonic inhomogeneities, are corrected to extend the range of high-resolution nanothermometry beyond 500 K with a precision of 1-4 K. This work will improve the accuracy of nanothermometry not only in micro- and nanoelectronics, but also in other fields with photonically inhomogeneous substrates.
ACS APPLIED NANO MATERIALS
(2021)
Article
Multidisciplinary Sciences
Sylwia Ryszczynska, Inocencio R. Martin, Tomasz Grzyb
Summary: Recently, the upconversion phenomenon has attracted attention in luminescence thermometry due to its potential for precise and remote optical thermal sensing. In this study, unique nanoparticles were synthesized and showed significant changes in emission intensity with temperature. By comparing the luminescence intensity ratios of the near-infrared bands, we demonstrate that they possess unique and excellent optical temperature sensing properties.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
K. Maciejewska, L. Marciniak
Summary: The increasing popularity of luminescence thermometry in recent years is driven by its high potential for applications. However, a comprehensive understanding of the thermal processes responsible for changes in the shape of the emission spectrum of luminophores is necessary for practical usage. In this study, we demonstrate how the concentration of Nd3+ dopant ions influences the thermometric parameters of a NaYF4:Nd3+ thermometer based on the ratio of Stokes to anti-Stokes emission intensities. Our findings show that the spectral broadening of the absorption band enables the modulation of relative sensitivity, usable temperature range, and uncertainty of temperature determination in such a luminescent thermometer.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Govind B. B. Nair, Sumedha Tamboli, S. J. Dhoble, Hendrik C. C. Swart
Summary: Luminescence nanothermometers based on LaOF:Yb3+, Er3+ upconversion nanoparticles were studied. The fluorescence intensity ratio (FIR) of the nanoparticles was recorded at different temperatures in the visible and near-infrared regions. Optimal laser conditions were identified to prevent laser heating of the nanoparticles. The behavior of the nanoparticles under laser exposure was analyzed to determine the critical laser power below which laser heating was negligible. This approach serves as a benchmark for testing luminescent nanothermometers.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lin Li, Chun Zhang, Lei Xu, Changqing Ye, Shuoran Chen, Xiaomei Wang, Yanlin Song
Summary: Triplet-triplet annihilation (TTA) upconversion is a unique non-linear photophysical process that converts low-energy photons into high-energy photons. In this study, a luminescence ratiometric nanothermometer was developed using TTA upconversion nanomicelles, showing linear relationships between luminescence ratio and temperature. Chemical modification of annihilators and stereochemical engineering were found to influence thermal sensitivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Physics, Condensed Matter
L. F. Dos Santos, J. C. Martins, K. O. Lima, L. F. T. Gomes, M. T. De Melo, A. C. Tedesco, L. D. Carlos, R. A. S. Ferreira, R. R. Goncalves
Summary: Luminescent Y2O3 nanoparticles were successfully synthesized with excellent stability in biological media and demonstrated high cell viability. These nanoparticles showed potential as a primary thermometer with high thermal sensitivity and repeatability, suggesting their use as contactless optical thermal sensors. Additionally, their application in a theranostic platform for cancer therapy was proposed, leveraging their ability to simultaneously monitor temperature and produce reactive oxygen species.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Long Yan, Jinshu Huang, Zhengce An, Qinyuan Zhang, Bo Zhou
Summary: This study reports a novel mechanistic design to achieve ultrasensitive thermally activated upconversion in an erbium sublattice core-shell nanostructure. By utilizing a surface interaction and energy migration, the upconverted luminescence is markedly enhanced in the thermal field. The use of non thermally coupled emissions contributes to higher thermal sensitivity. This finding paves a new way for the development of smart luminescent materials towards various emerging applications.
Article
Chemistry, Analytical
Yuemei Li, Yongmei Li, Yandong Bai, Rui Wang
Summary: The use of rare earth-doped upconversion nanoparticles (UCNPs) has gained attention in the fields of biosensitivity and biological imaging. However, their sensitivity at low temperatures is limited due to the large energy difference of rare earth ions. In this study, we designed core-shell-shell NaErF4:Yb@Nd2O3@SiO2 UCNPs that can produce multi-color upconversion emissions at extremely low temperatures. The injection of NaErF4:Yb@Nd2O3@SiO2 enables blue upconversion emission imaging of frozen heart tissue, demonstrating the potential of this UCNP as a low-temperature sensitive bio-logical fluorescence probe.
Article
Biochemistry & Molecular Biology
Yuting Li, Yufei Wang, Hong Shang, Jing Wu
Summary: In this study, a new strategy for the synthesis of photosensitizers (PSs) was proposed by modifying graphene quantum dots (GQDs) on the surface of rare-earth elements doped upconversion nanoparticles (UCNPs) to produce UCNPs@GQDs with core-shell structure. This new type of PSs efficiently produced reactive oxygen species (ROS) under near-infrared light excitation to trigger the photodynamic therapy (PDT) process. UCNPs@GQDs exhibited high biocompatibility and concentration-dependent PDT efficiency, shedding light on nanomaterials-based PDT development.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Chemistry, Multidisciplinary
Marta Quintanilla, Malou Henriksen-Lacey, Carlos Renero-Lecuna, Luis M. Liz-Marzan
Summary: This article discusses the various methods of using nanothermometers for temperature sensing in heterogeneous environments, with a focus on recent developments in incorporating luminescent nanoparticles into complex in vitro and in vivo models. Methods for avoiding thermal misreading are also discussed, considering their respective advantages and drawbacks.
CHEMICAL SOCIETY REVIEWS
(2022)
Article
Chemistry, Inorganic & Nuclear
Thulitha M. Abeywickrama, Yuanbing Mao
Summary: In this study, Yb3+ and Er3+ co-doped SrMoO4 submicron spindles with strong green upconversion luminescence (UCL) emission were synthesized via a hydrothermal (HT) process without annealing. The UCL intensity of the annealed samples surpassed those produced by the solid-state method and is comparable to that from the commercial NaYF4:Yb,Er sample. The temperature-dependent luminescence of the synthesized samples was also studied.
DALTON TRANSACTIONS
(2023)
Article
Multidisciplinary Sciences
Armin Zarghami, Mahboubeh Dolatyari, Hamit Mirtagioglu, Ali Rostami
Summary: In this study, colloids of graphene quantum dots (GQDs) and doped graphene quantum dots (Co-GQDs and Nd-GQDs) surrounded by carboxylic acids were synthesized, and the carboxylic acid groups were exchanged with amoxicillin. The results showed that Co-GQDs and Nd-GQDs had higher quantum efficiency and upconversion emission intensity, and DFT calculations indicated trap levels in the band gap of doped GQDs, which contributed to the upconversion phenomenon.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Rabab A. Mostafa, Ibrahim M. El-Sherbiny, Nabila S. Selim, Abdelsattar M. Sallam, Hoda A. Ashry
Summary: This study presents a simple method for synthesizing strontium nanoparticles-decorated reduced graphene oxide (rGO-Sr) nanosheets, which exhibit good blood biocompatibility and antibacterial activity.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Kehong Lv, Lang Yao, Xinyu Fu, Xuan Gao, Hongli Wang, Yifei Zhou, Ruohao Zhang, Yu Lu, Jing Feng, Hongjie Zhang
Summary: Researchers developed a nanoplatform called UICCIP, which combines indocyanine green-equipped upconversion nanoparticles (UCNPs) with CeO2 modified with NH2-PEG1000-cRGDfK. This nanoplatform enhances the photodynamic therapy (PDT) effect of tumors by generating reactive oxygen species (ROS) through two pathways.
Article
Chemistry, Multidisciplinary
Daniel Walo-Martin, Franzette Paz-Buclatin, Susana Rios, Inocencio R. Martin, Leopoldo L. Martin, Airan Rodenas, Vladimir N. Sigaev, Vitaliy Savinkov, Georgiy Y. Shakhgildyan
Summary: The research on YAS glass microspheres doped with Nd3+ ions shows their potential as optical temperature sensors and low power laser devices. By calibrating the sample using fluorescence intensity ratio (FIR) technique, the maximum sensitivity and temperature resolution limit of the microsphere sensor were obtained.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
C. Sunyol, R. English Owen, M. D. Gonzalez, P. Salagre, Y. Cesteros
Summary: Nickel catalysts supported on mesoporous clays were modified with magnesium oxide to enhance activity and selectivity in the hydrogenation of furfural to tetrahydrofurfuryl alcohol. The addition of MgO neutralized acidity, leading to higher selectivity to the desired product. The best catalyst achieved total conversion and selectivity to THFA, with maintained activity after multiple reuses.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Multidisciplinary
Albenc Nexha, Maria Cinta Pujol, Joan Josep Carvajal, Francesc Diaz, Magdalena Aguilo
Summary: The incorporation of oleic acid and oleylamine as organic surfactant coatings in a novel solvothermal synthesis procedure led to the formation of monoclinic KLu(WO4)(2) nanocrystals. These nanocrystals can generate photoluminescence and heat, acting as nanothermometers and photothermal agents in the biological window, upon excitation with near infrared, and have self-assessing properties studied through ex-vivo experiment.
Article
Chemistry, Multidisciplinary
Josue Mena, Joan J. Carvajal, Vitaly Zubialevich, Peter J. Parbrook, Francesc Diaz, Magdalena Aguilo
Summary: Porous GaN epitaxial layers were prepared using single-step CVD, with the degree of porosity and pore diameters found to depend on deposition time; as deposition time increased, a transition from hydrophilic to hydrophobic behavior of water droplets on GaN surface was observed.
Article
Chemistry, Analytical
Franzette Paz-Buclatin, Ylenia Perera-Suarez, Inocencio R. Martin, Susana Rios, Omar de Varona, Airan Rodenas, Leopoldo L. Martin
Summary: This study validates the commonly employed technique of laser-induced heating in optical temperature sensing research and demonstrates the application of Er3+-doped glass microspheres as remote optical temperature sensors.
Article
Nanoscience & Nanotechnology
Franzette Paz-Buclatin, Marcos Esquivel-Gonzalez, Alfredo Casasnovas-Melian, Omar de Varona, Carlos Cairos, Juan Manuel Trujillo-Sevilla, Kei Kamada, Akira Yoshikawa, Jose Manuel Rodriguez-Ramos, Leopoldo Luis Martin, Airan Rodenas
Summary: This work develops a 3D laser nanolithography technique for fabricating mm-long hollow nanopores inside solid-state laser crystals with high control over pore shape and size. The study investigates the formation of pores under different temperature and laser pulse parameters. The technique shows potential for practical nanofabrication in nanophotonics and for application in harsh environments.
Article
Optics
G. Martin, G. Zhang, M. Bonduelle, R. Allaw, M. Callejo, A. Rodenas, G. Cheng, R. Stoian, C. D'amico
Summary: Direct ultrafast laser photoinscription of transparent materials is a powerful technique for the development of embedded 3D photonics. It enables the volume fabrication of waveguiding structures in flexible 3D designs and adjustable refractive index contrast parameters, avoiding in-plane cross-ings of waveguides and allowing for the fabrication of high aspect ratio nanostructures. The technique has been successfully applied to develop integrated robust 3D three-telescope beam combiners and embedded diffraction gratings for astronomy applications.
Article
Social Issues
David Ortega-Jimenez, Luis Alvarado, Alejandra Trillo, Francisco D. Bretones
Summary: The workplace is a major site of discrimination against socially vulnerable groups, particularly immigrant workers who face mistreatment and racism in menial jobs. This study uses qualitative interviews with 42 Ecuadorian immigrant workers in Spain to investigate the experiences of discrimination they face in their daily workplaces. The findings highlight that immigrant workers endure daily discrimination, characterized by increased scrutiny, lower levels of trust compared to their Spanish counterparts, and violations of contractual agreements by supervisors. These workers also suffer from a lack of recognition and feelings of being undervalued due to their lower-skilled positions. The analysis reveals that supervisors and even colleagues subject the interviewees to racial slurs, verbal abuse, and unequal treatment, leaving them feeling powerless and unable to confront or reject such treatment. These factors contribute to a sense of humiliation and dependence.
Article
Engineering, Chemical
Vladimir Sanchez, Maria Dolores Gonzalez, Pilar Salagre, Yolanda Cesteros
Summary: 5-hydroxymethylfurfural (5-HMF) is an important platform molecule for synthesizing high-added value products. Different acid modified clay materials were studied as catalysts for obtaining 5-HMF from glucose. The effects of acidity, reaction conditions, and catalyst/glucose ratio on conversion and selectivity to 5-HMF were investigated. Using H-fluorohectorite as the catalyst resulted in the best selectivity to 5-HMF, while a mixture of Amberlyst-15 and montmorillonite K10 showed the highest selectivity at an optimized proportion.
Proceedings Paper
Engineering, Electrical & Electronic
A. Rodenas, F. Paz-Buclatin, A. Casasnovas Melian, O. De Varona, L. L. Martin, I. R. Martin
Summary: A recent report has shown that 3D architectures can be sculpted inside laser crystals with nanoscale precision, using a wet-chemical etching selectivity mechanism. This new technology has the potential to disrupt future manufacturing in photonics and nanotechnology.
LASER-BASED MICRO- AND NANOPROCESSING XVI
(2022)
Article
Psychology, Multidisciplinary
Francisco D. Bretones, Maria J. Jaimez
Summary: Psychological empowerment is a construct composed of four basic cognitions (impact, competence, meaning, and self-determination) that has positive consequences on people's results and wellbeing. The adapted Spanish version of the Psychological Empowerment Instrument (PEI) confirms the factor structure in four dimensions and shows good fit indexes. Psychological empowerment is significantly related to other variables, such as structural empowerment, affective commitment, and intention to leave.
INTERDISCIPLINARIA
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Airan Rodenas, Giacomo Corrielli, Petra Paie, Roberto Osellame
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Chemistry, Multidisciplinary
Li Xu, Yu Liu, Ziwen Zhou, Xianhao Sun, Isam Ud Din, Fahim Khan, Yanzeng Li, Hanyang Li, Jing Ren, Joan J. Carvajal, Jianzhong Zhang, Lu Liu
Summary: Yb3+ serves not only as a sensitizer but also as an energy reservoir to improve the upconversion efficiency of various lanthanide activators by facilitating energy cycling between the activator and Yb3+. This energy cycling not only enhances energy utilization for upconversion luminescence generation but also provides an additional excited-state absorption route for the activator.
Review
Chemistry, Multidisciplinary
Albenc Nexha, Joan Josep Carvajal, Maria Cinta Pujol, Francesc Diaz, Magdalena Aguilo
Summary: The development of lanthanide-doped non-contact luminescent nanothermometers has led to their use as accurate, efficient and fast diagnostic tools, replacing conventional contact thermal probes, due to their versatility, stability and narrow emission band profiles. These nanothermometers utilize lanthanide-doped materials as temperature nanosensors, excited by UV, visible or NIR light, emitting in the I-BW, II-BW, III-BW and IV-BW regions, showing advantages such as reduced phototoxicity and photobleaching, improved image contrast and deeper tissue penetration. Factors affecting the thermal sensitivity and temperature resolution of lanthanide ion-doped nanomaterials in biomedical applications are summarized, along with strategies to boost their sensing properties in each biological window.
Article
Materials Science, Multidisciplinary
Albenc Nexha, Joan J. Carvajal, Maria Cinta Pujol, Francesc Diaz, Magdalena Aguilo
Summary: Monoclinic potassium lutetium double tungstate (KLu(WO4)(2)) microcrystals with precise rod shape were successfully synthesized using a novel thermal decomposition-assisted method. The potential applications of the microrods were confirmed by properly doping with lanthanide ions and recording their emission in the visible and near-infrared range. The photothermal conversion efficiency of the microrods was analyzed and found to be higher than that of nanoparticles synthesized by other methods and comparable to that of gold nanorods.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
