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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Synthesis and characterization of germanium sulfide aerogels
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Synthesis and characterization of germanium sulfide aerogels

机译：硫化锗气凝胶的合成与表征

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摘要

The synthesis of germanium sulfide gels by thiolysis reactions of a non-aqueous solution of Ge(OEt)(4), followed by supercritical fluid extraction to create aerogels, is described. Analysis of the as-prepared GeSx aerogels by powder X-ray diffraction (PXRD) and surface area analysis reveals an amorphous structure exhibiting very high surface areas, 755 m(2)/g, that rival those of the best SiO2 aerogels when compared on a per mole basis. Transmission electron microscopy shows that the aerogel material is composed of a continuous network of GeSx colloidal particles assembled in a three-dimensional architecture. A detailed comparison of GeSx aerogels and their xerogel (bench-top dried) counterparts in terms of the influence of the synthetic methodology on morphology and surface area is reported. In the presence of adventitious moisture, the amorphous GeSx is oxidized to a crystalline phase identified by X-ray photoelectron spectroscopy, Raman spectroscopy and PXRD cell refinement to be hexagonal GeO2. (c) 2005 Elsevier B.V. All rights reserved.
机译：描述了通过Ge（OEt）（4）的非水溶液的硫解反应合成硫化锗凝胶，然后通过超临界流体萃取生成气凝胶的方法。通过粉末X射线衍射（PXRD）和表面积分析对所制备的GeSx气凝胶进行分析，发现无定形结构具有非常高的表面积755 m（2）/ g，在与SiO2气凝胶进行比较时可与最佳SiO2气凝胶媲美。每摩尔。透射电子显微镜显示，气凝胶材料由以三维结构组装的GeSx胶体颗粒的连续网络组成。报告了GeSx气凝胶及其干凝胶（台式干燥）对应物在合成方法对形态和表面积影响方面的详细比较。在不定水分的存在下，无定形GeSx被氧化成结晶相，该结晶相通过X射线光电子能谱，拉曼光谱和PXRD电池细化鉴定为六方GeO2。 （c）2005 Elsevier B.V.保留所有权利。

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