Catalyst role of Nd3+ ions for the precipitation of silver nanoparticles in phosphate glass

Jiménez, José A.; Sendova, Mariana

doi:10.1016/j.jallcom.2016.08.231

Cited by 16 publications

(3 citation statements)

References 65 publications

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“…This type of behavior has been associated with depolymerization effects in phosphate glasses. , Namely, shorter PO 4 tetrahedra chains yield higher frequency components of the ν s (POP) band, where an asymmetric extension toward higher frequencies points to asymmetric distributions of chain lengths toward shorter chains. The current appraisal is then in agreement with reports indicating that Nd 3+ doping of phosphate-based glasses produced a depolymerization effect as probed by various spectroscopies including 31 P nuclear magnetic resonance (NMR). ,,− …”

Section: Resultssupporting

confidence: 88%

Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Jiménez

2024

ACS Org. Inorg. Au

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Near-infrared (NIR)-emitting phosphate glasses containing Nd 3+ ions are attractive for applications in laser materials and solar spectral converters. The composition− structure−property relation in this type of glass system is thus of interest from fundamental and applied perspectives. In this work, Nd 3+ -containing glasses were made by melting with 50P 2 O 5 -(50 − x)BaO-xNd 2 O 3 (x = 0, 0.5, 1.0, 2.0, 3.0, 4.0 mol %) nominal compositions and studied comprehensively by density and related physical properties, X-ray diffraction (XRD), Raman spectroscopy, O 1s X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), dilatometry, ultraviolet−visible (UV−vis)−NIR optical absorption, and photoluminescence (PL) spectroscopy with decay dynamics assessment. The densities and molar volumes of the Nd 3+ -containing glasses generally increased with Nd 2 O 3 concentration also resulting in shorter Nd 3+ −Nd 3+ distances. XRD supported the amorphous nature of the glasses, whereas the Raman spectra evolution was indicative of glass depolymerization being induced by Nd 3+ ions. Oxygen (1s) and phosphorus (2p) analysis by XPS for the glass with 4.0 mol % Nd 2 O 3 agreed with the increase in nonbridging oxygens relative to the undoped host. DSC results showed that the glass transition temperatures increased with Nd 3+ concentration, with the glasses also displaying a decreased tendency toward crystallization. Dilatometry showed trends of increasing softening temperatures and decreasing thermal expansion coefficients with increasing Nd 2 O 3 content. A glass strengthening/tightening effect was then indicated to be induced by Nd 3+ with higher field strength compared to Ba 2+ ions. The UV−vis−NIR absorption by Nd 3+ ions increased consistently with Nd 3+ concentration. The UV−vis absorption edges of the Nd-containing glasses were also analyzed via Tauc and Urbach plots for comparison with the undoped host. Concerning the PL behavior, the Nd 3+ NIR emission intensity was highest for 1.0 mol % Nd 2 O 3 and decreased thereafter. The decay kinetics of the 4 F 3/2 emitting state in Nd 3+ ions analyzed revealed decreasing lifetimes where the decay rate analysis pointed to the prevalence of ion−ion excitation migration leading to PL quenching at high Nd 3+ concentrations.

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Section: Resultssupporting

confidence: 88%

Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Jiménez

2024

ACS Org. Inorg. Au

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“…A similar outcome has been observed in Raman spectra obtained for other Nd-doped phosphate-based glasses, interpreted as an effect from Nd 3+ ions decreasing bond covalency and impacting the PO 2 bond asymmetric stretch considerably. 34 , 35 Furthermore, toward the low-frequency region, the ν s (POP) band (BO-related) shows some differences among the glasses, for instance, concerning position and intensity relative to the ν s (PO 2 – ) band (NBO-related). To aid in the evaluation, presented in Table 5 are the peak positions of the ν s (POP) and ν s (PO 2 – ) bands as parameters of interest.…”

Section: Resultsmentioning

confidence: 99%

Impact of Lanthanide (Nd³⁺, Gd³⁺, and Yb³⁺) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses

Jiménez,

Amesimenu,

Thomas

2024

J. Phys. Chem. B

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Phosphate glasses containing Nd 3+ , Gd 3+ , and Yb 3+ as lanthanide ions are attractive for applications in laser materials, phototherapy lamps, and solar spectral converters. The composition−structure−property relation in this type of glass system is thus of interest from fundamental and applied perspectives. In this work, the impact of the differing ionic radius of Nd 3+ , Gd 3+ , and Yb 3+ and consequent field strength on the physical properties of phosphate glasses is investigated, focusing ultimately on thermal expansion effects. The glasses were made by melting with a fixed concentration of the lanthanide ions having 50P 2 O 5 −46BaO−4Ln 2 O 3 nominal compositions (mol %) with Ln = Nd, Gd, and Yb. The investigation encompassed measurements by X-ray diffraction (XRD), optical spectroscopy, density, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and dilatometry. XRD supported the amorphous nature of the glasses, whereas absorption and photoluminescence spectra showed the optical features of the Nd 3+ , Gd 3+ , and Yb 3+ ions in the glasses. Oxygen speciation by XPS indicated an increase in nonbridging oxygens for the larger radii Nd 3+ and Gd 3+ ions relative to the host, contrasting with Yb 3+ . Phosphorus XPS analysis further supported the hypothesis that the P 2p binding energies of the glasses increased with the cation field strength of the lanthanides. The Raman spectra were interpreted based on glass depolymerization effects and the impact of Ln 3+ ions with high field strength. Particularly, the band position of the symmetric out-of-chain nonbridging oxygen stretch, ν s (PO 2 − ), shifted to higher frequencies correlating with the Ln 3+ field strength. Dilatometry ultimately revealed a steady decrease in the coefficient of thermal expansion for the glasses, which correlated linearly with Ln 3+ field strengths and thus indicated to sustain increased glass rigidities. The various analyses performed thus illuminated the structural foundation of the thermomechanical behavior of the glasses connected with changes in the Ln 3+ field strengths.

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“…The introduction of the sodium polyphosphate to the organic matrix revealed an additional band at about 744 cm -1 , assigned to the symmetrical vibration of the P-O-P bridges υs (P-O-P) in the metaphosphate chains 13,14 . In this study, we chose to use curve fitting to approximate the two band shapes and thereby separate the two overlapping regions.…”

Section: Figure 4 Assignments Of the Characteristic Raman Peaks In Napo3mentioning

confidence: 99%

Spectroscopic and thermal degradation studies of novel hybrid polymer based on sodium polyphosphate - polystyrene

et al. 2018

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We have synthesized by the hydrophobic effect a new hybrid polymer material (HP) composed of segments of different solubility: polystyrene (hydrophobic) and sodium metaphosphate (hydrophilic). The structure and thermal stability of these hybrid materials were investigated and compared to the starting materials using X-ray diffraction (XRD), 31P Nuclear Magnetic Resonance, Raman spectroscopy and thermogravimetric analysis (TGA).The structure of the hybrid material consists of a mixture of phosphate compounds resulting from the hydrolysis of NaPO3. The phosphate groups have probably formed hydrogen bonds with aromatic CH. Furthermore, the delocalization of the electrons in the aromatic group generates negative poles that can interact with the positively charged Na ion, forming a cation-Ï€ interaction.The thermal characterization of these hybrids shows a clear improvement of the thermal property. TGA results show that phosphates increase HP residues yields at 600°C. Thus, Raman spectroscopy results provide evidence for the formation of residues having an aromatic phosphocarbon and an aromatic graphitic structure.

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Catalyst role of Nd3+ ions for the precipitation of silver nanoparticles in phosphate glass

Cited by 16 publications

References 65 publications

Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Impact of Lanthanide (Nd³⁺, Gd³⁺, and Yb³⁺) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses

Spectroscopic and thermal degradation studies of novel hybrid polymer based on sodium polyphosphate - polystyrene

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Catalyst role of Nd3+ ions for the precipitation of silver nanoparticles in phosphate glass

Cited by 16 publications

References 65 publications

Holistic Assessment of NIR-Emitting Nd3+-Activated Phosphate Glasses: A Structure–Property Relationship Study

Holistic Assessment of NIR-Emitting Nd3+-Activated Phosphate Glasses: A Structure–Property Relationship Study

Impact of Lanthanide (Nd3+, Gd3+, and Yb3+) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses

Spectroscopic and thermal degradation studies of novel hybrid polymer based on sodium polyphosphate - polystyrene

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Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Holistic Assessment of NIR-Emitting Nd³⁺-Activated Phosphate Glasses: A Structure–Property Relationship Study

Impact of Lanthanide (Nd³⁺, Gd³⁺, and Yb³⁺) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses