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Understanding the formation mechanism and the 3D structure of Mo(SxSe1-x)(2) nanoflowers

机译:了解Mo(SxSe1-x)(2)纳米花的形成机理和3D结构

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Nanoflowers of layered materials are promising building blocks for photocatalysis due to their unique morphology and exposed edges. Colloidal synthesis of MoS2, MoSe2 and their alloys was used to produce fine nanoflowers with tunable composition. The alloys follow Vegard's law, showing homogeneous composition. They exhibit fully tunable optical properties, where the exciton positions change with alloy composition. Samples annealed under vacuum retain their fine morphology and their composition, which closely follows the feed ratio. Time series analysis was used to investigate the formation mechanism. The results support a growth mechanism of fast-precipitating amorphous material, followed by crystallization of a few layers of small sheets, which curl and tangle around themselves. Electron tomography of the time series reveals a perforated structure without a dense core, supporting the suggested growth mechanism. These structures show multiple exposed edge sites, making them promising materials for applications such as photocatalysis.
机译:层状材料的纳米花由于其独特的形态和暴露的边缘,是光催化的有希望的基础。 MoS2,MoSe2及其合金的胶体合成用于生产具有可调组成的精细纳米花。合金遵循Vegard定律,显示均匀的成分。它们表现出完全可调的光学特性,其中激子位置随合金成分而变化。在真空下退火的样品保持了良好的形态和组成,紧随进料比。时间序列分析用于研究形成机理。结果支持了快速沉淀的非晶态材料的生长机理,随后是几层小片的结晶,这些小片围绕自身卷曲和缠结。时间序列的电子断层扫描显示没有致密核心的穿孔结构,支持了建议的生长机理。这些结构显示出多个暴露的边缘部位,使其成为有前景的材料,可用于光催化等应用。

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