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H2-induced copper and silver nanoparticle precipitation inside sol-gel silica optical fiber preforms

机译:H2诱导的溶胶-凝胶二氧化硅光纤预制棒内部的铜和银纳米粒子沉淀

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摘要

Ionic copper- or silver-doped dense silica rods have been prepared by sintering sol-gel porous silica xerogels doped with ionic precursors. The precipitation of Cu or Ag nanoparticles was achieved by heat treatment under hydrogen followed by annealing under air atmosphere. The surface plasmon resonance bands of copper and silver nanoparticles have been clearly observed in the absorption spectra. The spectral positions of these bands were found to depend slightly on the particle size, which could be tuned by varying the annealing conditions. Hence, transmission electron microscopy showed the formation of spherical copper nanoparticles with diameters in the range of 3.3 to 5.6 nm. On the other hand, in the case of silver, both spherical nanoparticles with diameters in the range of 3 to 6 nm and nano-rods were obtained.
机译:通过烧结掺杂有离子前体的溶胶-凝胶多孔二氧化硅干凝胶,已经制备了离子掺杂铜或银的致密二氧化硅棒。通过在氢气中进行热处理,然后在空气气氛中进行退火,可以实现Cu或Ag纳米颗粒的沉淀。在吸收光谱中已经清楚地观察到了铜和银纳米颗粒的表面等离子体共振带。发现这些条带的光谱位置在一定程度上取决于颗粒大小,可以通过改变退火条件来调节其大小。因此,透射电子显微镜显示直径为3.3至5.6nm范围内的球形铜纳米颗粒的形成。另一方面,在银的情况下,均获得了直径在3至6nm范围内的球形纳米颗粒和纳米棒。

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