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ASAXS study on the formation of core-shell Ag/Au nanoparticles in glass

机译：ASAXS研究玻璃中核壳型Ag / Au纳米粒子的形成

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摘要

Nanosized metal particles of various configurations embedded in surface regions of glass have great potential as nonlinear optical materials for photonic devices. We have prepared Ag/Au nanoparticles in core-shell configuration in soda-lime silicate glass by double-ion implantation and investigated their structural characteristics by anomalous small-angle x-ray scattering (ASAXS) and transmission electron microscopy. Measurements at x-ray energies slightly below the Au L-3 edge indicate the formation of bimetallic Ag/Au shells in some of the nanoparticles for high-dose ion implantation. An element-specific analysis of the ASAXS results allowed us not only to validate and quantify the core-shell structure, but simultaneously also the composition of the shells. Hollow nanoparticles were found for an Au-Ag implantation sequence, whereas an Ag-Au sequence generates a diluted core composition. The shift of the maximum position of optical absorption of the samples due to surface plasmon resonance of bimetallic nanoparticles, as monitored by optical spectroscopy, revealed the considerable influence of the respective particle configuration.
机译：嵌入在玻璃表面区域中的各种结构的纳米级金属颗粒作为光子器件的非线性光学材料具有巨大的潜力。我们已经通过双离子注入在钠钙硅酸盐玻璃中制备了核壳结构的Ag / Au纳米颗粒，并通过反常小角X射线散射（ASAXS）和透射电子显微镜研究了其结构特征。在稍低于Au L-3边缘的X射线能量处进行的测量表明，在一些用于大剂量离子注入的纳米粒子中，双金属Ag / Au壳的形成。对ASAXS结果的元素特定分析使我们不仅可以验证和量化核-壳结构，而且还可以使壳的组成同时得到确认。发现中空纳米颗粒用于Au-Ag注入序列，而Ag-Au序列生成稀释的核心成分。由双金属纳米粒子的表面等离振子共振引起的样品的最大光吸收位置的位移，如通过光谱学监测的，揭示了各个颗粒构型的相当大的影响。

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