双金属片
锗酸盐
材料科学
离子
分析化学(期刊)
纳米颗粒
无定形固体
透射电子显微镜
发光
兴奋剂
结晶学
化学
纳米技术
光电子学
金属
色谱法
有机化学
冶金
作者
Alvaro Herrera,Oscar A. Restrepo,Naira Maria Balzaretti
标识
DOI:10.1021/acs.jpcc.2c07998
摘要
In this work, germanate glasses of composition 59GeO2-41PbO in mol% doped with Er3+ ions were synthesized using the melt-quenching route. Au and Ag nanoparticles and Au@Ag bimetallic nanoparticles were formed on the surface of the germanate glasses by ion implantation followed by thermal treatments. X-ray diffraction patterns confirmed the amorphous structure of the implanted glasses. Molecular dynamics was used to simulate the GeO2–PbO glass structure. Surface plasmon resonance bands centered at 486, 537, and 574 nm, obtained through ultraviolet–visible absorption spectra, supported the formation of Ag, Au, and Au@Ag nanoparticles, respectively. Transmission electron microscopy (TEM) revealed the presence of spherical Au and Ag nanoparticles as well as the presence of nonspherical Au@Ag bimetallic nanoalloys. Refractive index n and extinction coefficient k were measured by ellipsometry. Judd–Ofelt theory was applied to evaluate the phenomenological intensity parameters Ωλ(λ = 2,4,6) , radiative parameters, and stimulated emission cross-sections for glasses doped with Er3+ and implanted with Au @Ag bimetallic nanoalloys. Efficient boosting of the near-infrared emission for the 4I13/2 → 4I15/2 transition was observed in the glass doped with Er3+ ions due to the presence of Au@Ag bimetallic nanoalloys. The possible cause of this improvement in luminescent intensity was attributed to the strong local field effect due to the efficient synergy between Au@Ag bimetallic nanoalloys and the Er3+ ions. The results obtained in this work indicate that the vitreous system GeO2–PbO glass doped with Er3+ ions and with the incorporation of Au@Ag bimetallic nanoalloys via ionic implantation exhibit excellent spectroscopic properties compared to other vitreous host glasses doped with the Er3+, indicating its potential applications in optical amplifiers.
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