Silver doping of glasses

Gonella, Francesco

doi:10.1016/j.ceramint.2015.02.058

Cited by 44 publications

(20 citation statements)

References 129 publications

(127 reference statements)

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“…Undoped and Yb-doped GC films were identified by GC0 and GC4 labels, respectively. In order to introduce silver in the films, Ag + ↔Na + ion-exchange [ 33 ] was performed by immersing the samples in a molten salt bath (1 mol.% AgNO 3 in NaNO 3 ) at 350 °C for 1 h. After the ion exchange process, the samples were identified by GC0-A and GC4-A. Finally, post-exchange heat treatments for 1 h at 430 °C in air (samples GC0-C and GC4-C) were used to investigate the possibility of migration and aggregation of the metal ions.…”

Section: Methodsmentioning

confidence: 99%

Ag-Sensitized Yb3+ Emission in Glass-Ceramics

et al. 2018

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Rare earth doped materials play a very important role in the development of many photonic devices, such as optical amplifiers and lasers, frequency converters, solar concentrators, up to quantum information storage devices. Among the rare earth ions, ytterbium is certainly one of the most frequently investigated and employed. The absorption and emission properties of Yb3+ ions are related to transitions between the two energy levels 2F7/2 (ground state) and 2F5/2 (excited state), involving photon energies around 1.26 eV (980 nm). Therefore, Yb3+ cannot directly absorb UV or visible light, and it is often used in combination with other rare earth ions like Pr3+, Tm3+, and Tb3+, which act as energy transfer centres. Nevertheless, even in those co-doped materials, the absorption bandwidth can be limited, and the cross section is small. In this paper, we report a broadband and efficient energy transfer process between Ag dimers/multimers and Yb3+ ions, which results in a strong PL emission around 980 nm under UV light excitation. Silica-zirconia (70% SiO2-30% ZrO2) glass-ceramic films doped by 4 mol.% Yb3+ ions and an additional 5 mol.% of Na2O were prepared by sol-gel synthesis followed by a thermal annealing at 1000 °C. Ag introduction was then obtained by ion-exchange in a molten salt bath and the samples were subsequently annealed in air at 430 °C to induce the migration and aggregation of the metal. The structural, compositional, and optical properties were investigated, providing evidence for efficient broadband sensitization of the rare earth ions by energy transfer from Ag dimers/multimers, which could have important applications in different fields, such as PV solar cells and light-emitting near-infrared (NIR) devices.

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Section: Methodsmentioning

confidence: 99%

Ag-Sensitized Yb3+ Emission in Glass-Ceramics

et al. 2018

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“…Silver is a well-known antimicrobial agent [22,23], used and studied for many applications especially in the biomedical field [24][25][26]. Bioactive glasses and glass-ceramics containing silver have been extensively investigated [27][28][29][30][31][32][33]; however, on the basis of authors knowledge, only one study reported the investigation of a magnetic and silver-containing glass-ceramics [34]. Sharma et al examined the influence of silver content in a glass-ceramic having a composition very different (not bioactive) from the glass-ceramic investigated in this work.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional ferrimagnetic glass–ceramic for the treatment of bone tumor and associated complications

et al. 2017

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Silver-containing ferrimagnetic glass-ceramic (Ag-SC45) was synthesized by means of melt and quenching technique. Samples were subjected to morphological, compositional, structural analyses, ability to generate heat, magnetic measurements at high and low magnetic field and antibacterial test using S. aureus strain. The influence of silver introduction and the effect of annealing process were investigated. Morphological, compositional and structural analyses evidenced the formation of metallic silver particles embedded in the glass-ceramic. The hysteresis cycles showed slight differences in the hysteresis cycle area ratio and coercive field values as a function of the annealing treatment and of silver presence, while no difference was evidenced in the specific power loss. All samples demonstrated the ability to produce heat when exposed to an alternating magnetic field. Finally, preliminary antibacterial test showed that Ag-SC45 samples not subjected to annealing possessed an antibacterial effect.

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“…[9][10][11] Among many χ (3) materials utilized as nonlinear optical media, transparent silica-based composites doped with nanoparticles (NP), exhibiting strong plasmonic resonant response, have gained attention in recent years. [12][13][14] The use of isotropic NP-doped silica glass as nonlinear optical medium is advantageous because this material can be fabricated into desired shapes by application of standard low-cost methods like molding, grinding, or sanding. Additionally, such materials can be quite easily integrated with other silicon-based electronic components.…”

Section: Introductionmentioning

confidence: 99%

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

et al. 2019

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A composite in which gold nanoparticles (AuNPs) approximately 10 nm in size are embedded in amorphous transparent silica matrix has been produced. The synthetic protocol uses HAuCl4 as the Au ion source, tetraethoxysilane (TEOS) as the SiO2 precursor, and l‐ascorbic acid (AA) as the reducing agent. AA is employed before the sol‐gel process in an amount sufficient only for reduction of Au3+ ions to Au+. By using a cationic surfactant, benzylcetyldimethylammonium chloride hydrate (BDAC) and/or cetyltrimethylammonium bromide (CTAB), the Au+ ions are encapsulated within metalomicelles, which prevents them from being reduced to Au0 and enables their homogeneous distribution in the gel. Reduction of Au+ to Au0 and the growth of the AuNPs occurs at room temperature during the gelation, and arises from the release of EtOH during the hydrolysis of TEOS. The composites contain 0.027 wt % of Au. They exhibit nonlinear optical behavior characterized by the third‐order nonlinear refraction index, n2, in the range 3.6–5.7×10−16 cm2 W−1 at λ=1.030 μm. The composites are capable of effective third‐harmonic generation of ultrashort near‐IR (210 fs, 1.030 μm) laser pulse through a direct third‐order mechanism.

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Silver doping of glasses

Cited by 44 publications

References 129 publications

Ag-Sensitized Yb3+ Emission in Glass-Ceramics

Ag-Sensitized Yb3+ Emission in Glass-Ceramics

Multifunctional ferrimagnetic glass–ceramic for the treatment of bone tumor and associated complications

A Seedless Method for Gold Nanoparticle Growth inside a Silica Matrix: Fabrication of Materials Capable of Third‐Harmonic Generation in the Near‐Infrared

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