Particle size tailoring and luminescence of europium(III)-doped gadolinium oxide obtained by the modified homogeneous precipitation method: Dielectric constant and counter anion effects

Gaspar, Rafael Di Lázaro; Mazali, Ítalo Odone; Sígoli, Fernando Aparecido

doi:10.1016/j.colsurfa.2010.07.003

Cited by 52 publications

(31 citation statements)

References 28 publications

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“…The majority of classical X-PDT studies so far have been conducted with nanoparticles made from a top-down approach. Meanwhile, efforts are being made to develop synthetic approaches that enable nanoparticles to undergo annealing without causing aggregation (Gaspar, Mazali, & Sigoli, 2010).…”

Section: This Article Is Categorized Undermentioning

confidence: 99%

Nanoparticles to mediate X‐ray‐induced photodynamic therapy and Cherenkov radiation photodynamic therapy

Cline

Delahunty

Xie

2018

WIREs Nanomed Nanobiotechnol

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Photodynamic therapy (PDT) has emerged as an attractive option for cancer treatment. However, conventional PDT is activated by light that has poor tissue penetration depths, limiting its applicability in the clinic. Recently the idea of using X-ray sources to activate PDT and overcome the shallow penetration issue has garnered significant interest. This can be achieved by external beam irradiation and using a nanoparticle scintillator as transducer. Alternatively, research on exploiting Cherenkov radiation from radioisotopes to activate PDT has also begun to flourish. In either approach, the most auspicious success is achieved using nanoparticles as either a scintillator or a photosensitizer to mediate energy transfer and radical production. Both X-ray induced PDT (X-PDT) and Cherenkov radiation PDT (CR-PDT) contain a significant radiation therapy (RT) component and are essentially PDT and RT combination. Unlike the conventional combination, however, in X-PDT and CR-PDT, one energy source simultaneously activates both processes, making the combination always in synchronism and the synergy potential maximized. While still in early stage of development, X-PDT and CR-PDT address important issues in the clinic and hold great potential in translation. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease.

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Section: This Article Is Categorized Undermentioning

confidence: 99%

Nanoparticles to mediate X‐ray‐induced photodynamic therapy and Cherenkov radiation photodynamic therapy

Cline

Delahunty

Xie

2018

WIREs Nanomed Nanobiotechnol

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“…Fig.7 illustrate the excitation spectra of core, core/nSiO2 and core/nSiO2/mSiO2 NPs under monitoring 610 ( 5 D0→ 7 F2) nm emission wavelength at room temperature. The excitation spectra consist of several sharp excitation electronic transitions assigned to 7 F0→ 5 H3,6(321), 7 F0→ 5 D4(362), 7 F0→ 5 G3(381), 7 F0→ 5 L6(394), 7 F0→ 5 D3(415), and 7 F0→ 5 D2(466), which are originating from 4f-4f-intra-configurationally transitions of Eu 3+ ions [30,37,47,54,[57][58][59]. Figure 8 demonstrates the emission spectra of core, core/nSiO2 and core/nSiO2/ mSiO2 NPs upon excitation at 395 nm on room temperature.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Silica Modified Luminescent Gd<sub>2</sub>O<sub>3</sub>:Eu Nanoparticles: Physicochemical and Luminescence Properties

Aldalbahi

Rahaman

Ansari

2018

Preprint

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Highly colloidal Eu-doped Gd2O3 nanoparticles(core-NPs) were synthesized by thermal decomposition via weak base at low temperature (150oC), subsequently, silica layers were deposited to increased colloidal stability, solubility, biocompatibility and no-toxicity at the environmental condition. XRD results indicate the highly purified, crystalline, single phase cubic phase Gd2O3 nanocrystals. TEM image shows the mesoporous thick silica layer was effectively coated over the core nanocrystals, which have irregular size with nearly spherical shape and a mean grain size is about 10-30 nm. Absorption spectra and zeta potential results in aqueous media revealed that solubility, colloidal stability, and biocompatibility character was enhanced from core to core-shell structure because of silica layer surface encapsulation. The samples demonstrate excellent photoluminescence properties (dominant emission 5D0→7F2 transition in red region at 610 nm) indicated the advantage to use in optical bio-detection and bio-labeling etc. The photoluminescence intensity of the silica shell modified core/shell nanoparticles were suppressed relatively core-nanoparticles, it indicates the multi-photon relaxation pathways arising from the surface coated high vibrational energy molecules of the silanol groups. The core/nSiO2/mSiO2 nanocrystals display strong emission (5D0→7F2) transition along with excellent solubility and biocompatibility, which may find promising applications in photonic based biomedical applications.

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“…A modified electrode based on nano‐sized zinc oxide and CNTs have been reported for a sensitive determination of citalopram . However, europium nanoparticles have been subjected to a number of studies due to its chemical, electronic and optical properties Chaudhary and co‐workers have reported europium doped gadolinium oxide nanoparticles a potential photoluminescencent probe for highly selective and sensitive detection of metal ions . Sadeghat and et al.…”

Section: Introductionmentioning

confidence: 96%

Sensitive Determination of Terbutaline Using a Platform Based on Nanoparticles of Europium Oxide and Carbon Nanotubes

Teker

Aslanoğlu

2018

Electroanalysis

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This study presents a sensitive voltammetric determination of terbutaline (TER) on a platform based on carbon nanotubes (CNTs) and europium oxide nanoparticles (Eu2O3NPs) coated glassy carbon electrodes (GCEs). An ultrasonic bath was performed for the preparation of composite material. The material was characterized by energy dispersive X‐ray spectroscopy (EDX), X‐ray diffraction method (XRD) and scanning electron microscopy (SEM). The Eu2O3NPs/CNTs/GCE system was assessed for the oxidation of terbutaline (TER). A broad oxidation peak was appeared at 0.71 V using a bare GCE. However, the voltammetry of TER has been improved at a GCE coated with CNTs and a well‐defined anodic peak exhibited at 0.61 V. Furthermore, the nanoparticles of Eu2O3 and CNTs coated GCE has greatly improved the electrochemical behaviour of TER and a sharp peak was appeared at 0.59 V. Cyclic voltammetry at Eu2O3NPs/CNTs/GCE also reveals a high catalytic effect for the oxidation of TER with an oxidation peak that is distinctly enhanced compared to GCE and CNTs/GCE. Eu2O3 nanoparticles were utilized to enhance the surface area of GCE and then improve the sensitivity of the procedure. The response of TER was linear over a concentration range of 2.0×10−8 M −9.5×10−6 M with an LOD of 3.7×10−9 M. Square wave voltammetric analysis of tablets by Eu2O3NPs/CNTs/GCE yielded a recovery of 99.2 % with an RSD% of 3.2. The modified electrode (EuO2NPs/CNTs/GCE) provides accuracy and precision to the analysis of samples.

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Particle size tailoring and luminescence of europium(III)-doped gadolinium oxide obtained by the modified homogeneous precipitation method: Dielectric constant and counter anion effects

Cited by 52 publications

References 28 publications

Nanoparticles to mediate X‐ray‐induced photodynamic therapy and Cherenkov radiation photodynamic therapy

Nanoparticles to mediate X‐ray‐induced photodynamic therapy and Cherenkov radiation photodynamic therapy

Mesoporous Silica Modified Luminescent Gd<sub>2</sub>O<sub>3</sub>:Eu Nanoparticles: Physicochemical and Luminescence Properties

Sensitive Determination of Terbutaline Using a Platform Based on Nanoparticles of Europium Oxide and Carbon Nanotubes

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