Samarium doped hafnium oxide cubic and monoclinic nanometric powders synthesized by hydrothermal route

Martínez-Merlin, I.; Ramos-Guerra, A.I.; Balderas, J.U.; Pimentel, Rocio Guadalupe Casañas; Falcony, C.

doi:10.1016/j.ceramint.2019.02.215

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…For instance, the stabilization of the cubic phase in these systems can be achieved through the incorporation of trivalent or divalent ions into the lattice, and the subsequent generation of oxygen vacancies for charge compensation . Other papers, based on the density functional theory (DFT), have imputed the HfO 2 transition from the monoclinic to the cubic phase to the incorporation of dopants (for instance Y, Eu, and Gd) with ionic radii larger than that of the Hf ion (0.76–0.83 Å) and thus to an increase of the strain of the lattice . The lack of structural change evidenced in hafnia NPs after doping with Ti (Figure f–h) can be mainly due either to its ionic radius, which is significantly smaller than that of Hf and not able to stabilize the cubic phase at the considered concentrations, or to its valence.…”

Section: Materials Composition Morphology and Structurementioning

confidence: 99%

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Villa

Moretti

Fasoli

et al. 2019

Advanced Optical Materials

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The recent trends in scintillator technologies stimulate research efforts toward the development of novel materials morphologies, such as nanoparticles, able to efficiently convert ionizing radiations into light. For example, scintillating nanoparticles attract great interest in medical oncological therapies. In this work, the structural and morphological properties of HfO2:Ti nanoparticles with Ti concentrations from 0.03 to 10 mol% and subjected to calcination up to 1000 °C are thoroughly characterized; moreover, X‐ray photoelectron spectroscopy reveals the incorporation of Ti in both Ti (III) and Ti (IV) chemical states in as prepared samples, while the exclusive presence of Ti(IV) is unambiguously identified in calcined nanoparticles. The optical emission under X‐ray excitation evidences an intense Ti (IV)‐related luminescence at 2.5 eV in high temperature calcined samples with a few microseconds scintillation lifetime, and efficiency comparable to that of Bi4Ge3O12 reference scintillator. Finally, the competitive role of defects in charge carriers capture is demonstrated by the monotonic increase of the 2.5 eV band during prolonged X‐ray irradiation, more evident for nanoparticles with titanium concentration below 1 mol%. HfO2:Ti may also find application in X‐ray triggered oncological therapies by using the Ti (IV)‐related bright radioluminescence to excite photosensitizer molecules for singlet oxygen generation.

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Section: Materials Composition Morphology and Structurementioning

confidence: 99%

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Villa

Moretti

Fasoli

et al. 2019

Advanced Optical Materials

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“…When the doping concentration was 0.5% and the post-annealed temperature was 600 °C, the HfO 2 :Sm 3+ showed the best luminescent emission property compared with other doping groups. [60] Gerken et al prepared gadolinium (Gd) doped HfO 2 NPs via sol-gel method and compared them with Gd 2 O 3 NPs in terms of MRI contrast properties and the potential biological toxicity. The incorporation of the Gd 3+ significantly improved the T 2 -weighted contrast property of HfO 2 NPs.…”

Section: Metal Elements-doped Hfomentioning

confidence: 99%

“…[93] Similarly, Samarium-doped HfO 2 (HfO 2 :Sm 3+ ) NPs were fabricated through a hydrothermal route, and then the effects of different doping ratios and post-annealing temperatures on the structure, crystal form, and luminescence properties of the composite were explored. [60] Interestingly, in addition to animal imaging, Segmehl et al reported that Eu:HfO 2 can also be used as a tracker to study the permeability and diffusion [86] Copyright 2016, the Royal Society of Chemistry. C) The CT grayscale images of various [Hf/Zr/I] concentrations for Hf-UiO, Zr-UiO, and iodixanol dispersed in water.…”

Section: Fimentioning

confidence: 99%

Harnessing Hafnium‐Based Nanomaterials for Cancer Diagnosis and Therapy

Ding

Chen

Liao

et al. 2023

Small

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With the rapid development of nanotechnology and nanomedicine, there are great interests in employing nanomaterials to improve the efficiency of disease diagnosis and treatment. The clinical translation of hafnium oxide (HfO2), commercially namedas NBTXR3, as a new kind of nanoradiosensitizer for radiotherapy (RT) of cancers has aroused extensive interest in researches on Hf‐based nanomaterials for biomedical application. In the past 20 years, Hf‐based nanomaterials have emerged as potential and important nanomedicine for computed tomography (CT)‐involved bioimaging and RT‐associated cancer treatment due to their excellent electronic structures and intrinsic physiochemical properties. In this review, a bibliometric analysis method is employed to summarize the progress on the synthesis technology of various Hf‐based nanomaterials, including HfO2, HfO2‐based compounds, and Hf‐organic ligand coordination hybrids, such as metal‐organic frameworks or nanoscaled coordination polymers. Moreover, current states in the application of Hf‐based CT‐involved contrasts for tissue imaging or cancer diagnosis are reviewed in detail. Importantly, the recent advances in Hf‐based nanomaterials‐mediated radiosensitization and synergistic RT with other current mainstream treatments are also generalized. Finally, current challenges and future perspectives of Hf‐based nanomaterials with a view to maximize their great potential in the research of translational medicine are also discussed.

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Synthesis, characterization of undoped and copper-doped hafnium oxide nanoparticles by sol–gel method

Mahendran

Jeyakumar

Jothibas

et al. 2022

J Mater Sci: Mater Electron

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Samarium doped hafnium oxide cubic and monoclinic nanometric powders synthesized by hydrothermal route

Cited by 7 publications

References 27 publications

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Harnessing Hafnium‐Based Nanomaterials for Cancer Diagnosis and Therapy

Synthesis, characterization of undoped and copper-doped hafnium oxide nanoparticles by sol–gel method

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Samarium doped hafnium oxide cubic and monoclinic nanometric powders synthesized by hydrothermal route

Cited by 7 publications

References 27 publications

The Bright X‐Ray Stimulated Luminescence of HfO2 Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO2 Nanocrystals Activated by Ti Ions

Harnessing Hafnium‐Based Nanomaterials for Cancer Diagnosis and Therapy

Synthesis, characterization of undoped and copper-doped hafnium oxide nanoparticles by sol–gel method

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Product

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The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions