Experimental proof of the existence of water clusters in fullerene-like PrF3 nanoparticles

Alakshin, E. M.; Blokhin, Dmitriy; Sabitova, A.; Klochkov, A. V.; Клочков, В. В.; Kono, Kenichi; Кораблева, С. Л.; Tagirov, M. S.

doi:10.1134/s0021364012150027

Cited by 21 publications

(12 citation statements)

References 5 publications

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“…Moreover, it is known that the NPs synthesized via the same method contain water clusters inside the structure [37]. Also, the slight inhomogeneity of the Pr 3+ :LaF 3 ( Pr = 12%) NPs structure shown on Figure 1(b) suggests the presence of water clusters inside the NPs.…”

Section: Luminescent Nanothermometry Of Prmentioning

confidence: 96%

Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Pudovkin

Morozov

Pavlov

et al. 2017

Journal of Nanomaterials

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The main goal of this study was creating multifunctional nanoparticles based on rare-earth doped LaF 3 nanocrystals, which can be used as fluorescence thermal sensors operating over the 80-320 K temperature range including physiological temperature range (10-50 ∘ C). The Pr 3+ :LaF 3 ( Pr = 1%) microcrystalline powder and the Pr 3+ :LaF 3 ( Pr = 12%, 20%) nanoparticles were studied. It was proved that all the samples were capable of thermal sensing into the temperature range from 80 to 320 K. It was revealed that the mechanisms of temperature sensitivity for the microcrystalline powder and the nanoparticles are different. In the powder, the 3 P 1 and 3 P 0 states of Pr 3+ ion share their electronic populations according to the Boltzmann and thermalization of the 3 P 1 state takes place. In the nanoparticles, two temperature dependent mechanisms were suggested: energy migration within 3 P 0 state in the temperature range from 80 K to 200 K followed by quenching of 3 P 0 state by OH groups at higher temperatures. The values of the relative sensitivities for the Pr 3+ :LaF 3 ( Pr = 1%) microcrystalline powder and the Pr 3+ :LaF 3 ( Pr = 12%, 20%) nanoparticles into the physiological temperature range (at 45 ∘ C) were 1, 0.5, and 0.3% ∘ C −1 , respectively.

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Section: Luminescent Nanothermometry Of Prmentioning

confidence: 96%

Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Pudovkin

Morozov

Pavlov

et al. 2017

Journal of Nanomaterials

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“…The difference in size and shape of the PLNPs and the SLNPs can be explained by different synthesis conditions. In case of swift addition of NaF solution, the formation of the SLNPs is caused by homogeneous nucleation occurring when the concentration of rare earth and Fions becomes significantly higher than the equilibrium concentration immediately and the spontaneous growth of NPs takes place [30,31]. In the case of dropwise addition, the fast increase of Fions concentration does occur.…”

Section: Resultsmentioning

confidence: 99%

“…The first is the increasing in size of the NPs which leads to a reduction of the role of the surface. The second is the migration of the OH groups from the NP's core to specific water clusters [30,56,57] which leads to reducing the total amount of Pr 3+ ions contacting with OH groups.…”

Section: Optical Spectroscopy and Luminescencementioning

confidence: 99%

Characterization of Pr-Doped LaF₃ Nanoparticles Synthesized by Different Variations of Coprecipitation Method

Pudovkin

Koryakovtseva

Lukinova

et al. 2019

Journal of Nanomaterials

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A set of Pr3+:LaF3 nanoparticles (NPs) were synthesized via coprecipitation method at three stoichiometric proportions of La(NO3)3, Pr(NO3)3, and NaF (1 : 0.8, 1 : 1, and 1 : 6, respectively). Two ways of mixing of the La(NO3)3, Pr(NO3)3, and NaF solutions (dropwise and swift addition) were used. One sample was subjected to microwave (MW) treatment for 30, 90, and 180 min. All the samples were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). For all the samples, optical spectroscopy experiments were carried out. The XRD data were analyzed via the Debye-Scherrer and Williamson-Hall methods. It was revealed that the way of mixing of the La(NO3)3, Pr(NO3)3, and NaF solutions strongly affects the shape of the NPs. The slow dropwise addition of the NaF solution leads to the plate-like NP (PLNP) formation; otherwise, the swift addition of the NaF solution leads to the formation of more sphere-like NPs (SLNPs). The size and regularity in shape of the NP increase with the increasing stoichiometric proportion of La(NO3)3, Pr(NO3)3, and NaF from 1 : 0.8 to 1 : 6. The size and regularity in shape of the SLNPs increase with the increasing time of MW treatment. The Debye-Scherrer and Williamson-Hall methods confirmed the anisotropic shape of the PLNPs. The Williamson-Hall method showed that the values of strain are almost similar for all the samples (around 14∗10-4). Optical spectroscopy experiments revealed that although all the samples have an equal chemical composition, the luminescence lifetimes for different samples differ between each other. The luminescence lifetime of the PLNPs is less than that of the SLNPs having an equal stoichiometric proportion of La(NO3)3, Pr(NO3)3, and NaF. The luminescence lifetime of the 1 : 1 SLNPs increases with the increasing time of MW treatment.

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“…These samples were investigated by x-ray analysis, high-resolution transmission electronics microscopy, nuclear magnetic and nuclear pseudoquadrupole resonance methodics [12][13][14]. The following results were achieved: the crystal structure changing by microwave irradiation has been observed; water clusters have been discovered in the internal cavities of the nanoparticles; the parameters of the nuclear spin Hamiltonian have been determined; relaxation times of 19 F, 141 Pr and 3 He were investigated.…”

Section: Resultsmentioning

confidence: 99%

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

Alakshin

Gazizulin

Gazizulina

et al. 2015

Low Temperature Physics

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Experimental proof of the existence of water clusters in fullerene-like PrF3 nanoparticles

Cited by 21 publications

References 5 publications

Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Characterization of Pr-Doped LaF₃ Nanoparticles Synthesized by Different Variations of Coprecipitation Method

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

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Experimental proof of the existence of water clusters in fullerene-like PrF3 nanoparticles

Cited by 21 publications

References 5 publications

Physical Background for Luminescence Thermometry Sensors Based on Pr3+:LaF3 Crystalline Particles

Physical Background for Luminescence Thermometry Sensors Based on Pr3+:LaF3 Crystalline Particles

Characterization of Pr-Doped LaF3 Nanoparticles Synthesized by Different Variations of Coprecipitation Method

Comments on the cross-relaxation effect between adsorbed 3He and PrF3 nanoparticles

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Product

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Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Physical Background for Luminescence Thermometry Sensors Based on Pr³⁺:LaF₃ Crystalline Particles

Characterization of Pr-Doped LaF₃ Nanoparticles Synthesized by Different Variations of Coprecipitation Method