Impact of surface coating on physical properties of europium-doped gadolinium fluoride microspheres

Ansari, Anees A.; Aldalbahi, Ali; Labis, Joselito P.; Manthrammel, M. Aslam

doi:10.1016/j.jfluchem.2017.03.015

Cited by 24 publications

(11 citation statements)

References 46 publications

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“…Whereas in the case of core/nSiO2 NPs, initial weight loss is recorded below 200 o C it shows the removal of surface adsorbed residual water molecules. After that, a continuous greatest weight loss (~8%) is measured up to 800 o C, it implies to the burning and elimination of surface modified silica, in which silica is transforming into silicate agreeing well with TEM and EDX analysis [47].…”

Section: Resultssupporting

confidence: 76%

“…The emission band observed at around 585-598 nm is assigned to magnetic dipole transition which is weak with respect to forced electric dipole transition [30,60]. It is fact that forced electric dipole transition ( 5 D0→ 7 F2) is sensitive to the surrounding chemical environment whereas magnetic dipole transition ( 5 D0→ 7 F1) is independent to the surrounding environment [30,47,60,61]. It is obvious from the emission spectra of all three samples the emission efficiency of hypersensitive transition or electric dipole transition is higher than their respective magnetic dipole transition, it suggests that the trivalent europium ions are in the C2 site symmetry.…”

Section: Resultsmentioning

confidence: 96%

“…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%

“…( 5 D1→ 7 F1), 578( 5 D1→ 7 F3), 585-599 ( 5 D0→ 7 F1), 605-631 ( 5 D0→ 7 F2), 644-662 ( 5 D0→ 7 F3) and 684-712 ( 5 D0→ 7 F4) transitions, respectively [6,29,30,47,59,60]. Some weak intensity emission transitions located at 470 and 535 nm assigned to 5 D2→ 7 F0 and 5 D1→ 7 F1 transition of Eu 3+ ion, it indicate the low vibrational energy of the Gd-O band [6,58].…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the multiphonon relaxation by gadolinium-oxygen vibration is not able to bridge the gaps between the higher energy levels of 5 D2→ 7 F0 & 5 D1→ 7 F1 transition and the 5 D0→ 7 FJ level of Eu(III) ion completely, resulting in the emission from these levels [59]. A prominent emission transition is observed in between 605-630 nm because of 5 D0→ 7 F2 forced electric dipole transition and is hypersensitive to the environment [30,47,60]. The emission band observed at around 585-598 nm is assigned to magnetic dipole transition which is weak with respect to forced electric dipole transition [30,60].…”

Section: Resultsmentioning

confidence: 99%

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Mesoporous Silica Modified Luminescent Gd2O3: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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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Mesoporous Silica Modified Luminescent Gd2O3:Eu Nanoparticles: Physicochemical and Luminescence Properties

Aldalbahi

Rahaman

Ansari

2018

Preprint

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One-step time-resolved fluorescence microsphere immunochromatographic test strip for quantitative and simultaneous detection of DON and ZEN

et al. 2021

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Mesoporous silica modified luminescent Gd2O3:Eu nanoparticles: physicochemical and luminescence properties

Aldalbahi

Rahaman

Ansari

2018

J Sol-Gel Sci Technol

Self Cite

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Highly colloidal Gd 2 O 3 :Eu nanoparticles (core-NPs) were synthesized by thermal decomposition via weak base at low temperature. The sol-gel chemical process was employed for silica layer surface coating to increase solubility, colloidal stability, biocompatibility, and non-toxicity at the ambient conditions. XRD results indicate the highly purified, crystalline, single phase, and cubic phase Gd 2 O 3 nanocrystals. TEM image shows that the mesoporous thick silica layer was effectively coated on the core nanocrystals, which have irregular size with nearly spherical shape and grain size about 10-30 nm. An absorption spectra and zeta potential results in aqueous media revealed that solubility, colloidal stability, and biocompatibility character were enhanced from core to core-shell structure because of silica layer surface encapsulation. The samples, demonstrated excellent photoluminescence properties (dominant emission 5 D 0 → 7 F 2 transition in the red region at 610 nm), indicated to be used in optical bio-detection, bio-labeling, etc. The photoluminescence intensity of the silica shell modified core/shell NPs was suppressed relatively core-NPs; it indicates the multi-photon relaxation pathways arising from the surface coated high vibrational energy molecules of the silanol groups. The core/nSiO 2 /mSiO 2 nanocrystals display strong emission ( 5 D 0 → 7 F 2 ) transition along with excellent solubility and biocompatibility, which may find promising applications in the photonic based biomedical field.

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Impact of surface coating on physical properties of europium-doped gadolinium fluoride microspheres

Cited by 24 publications

References 46 publications

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

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

One-step time-resolved fluorescence microsphere immunochromatographic test strip for quantitative and simultaneous detection of DON and ZEN

Mesoporous silica modified luminescent Gd2O3:Eu nanoparticles: physicochemical and luminescence properties

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