Composition and electronic structure of porous silicon nanoparticles after oxidation under air- or freeze-drying conditions
Composition and electronic structure of porous silicon nanoparticles after oxidation under air- or freeze-drying conditions
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空气或冷冻干燥条件下氧化后多孔硅纳米粒子的组成和电子结构
DOI：
10.1016/j.matlet.2021.131608
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发表时间：
2021
影响因子：
3
通讯作者：
S. Turishchev
中科院分区：
文献类型：
--
作者：
D. Koyuda;S. S. Titova;U. A. Tsurikova;I. S. Kakuliia;E. Parinova;O. Chuvenkova;R. G. Chumakov;A. Lebedev;S. Kannykin;L. Osminkina;S. Turishchev
提出了一种通过改变干燥条件来控制多孔硅纳米颗粒的组成和电子结构的变化。两种类型的纳米粉末，获得从机械研磨的多孔硅薄膜与随后的空气或冷冻干燥处理。对所得纳米粒子的表面形貌和结构进行了研究。利用同步辐射超软X射线吸收近边结构谱技术对所研究的粉末进行了硅原子局域环境特异性和电子结构探测。观察到表面组成和结构的显著变化。空气干燥的多孔硅纳米颗粒的特征在于存在厚的表面氧化物层，而未氧化的硅原子的存在下，在小于3 nm的深度被证明为冻干的。
A controlled change in the composition and electronic structure of porous silicon nanoparticles by variation the drying conditions is proposed. Two types of nanopowders were obtained from mechanically milled porous silicon films with subsequent air- or freeze-drying processing. Obtained nanoparticles surface morphology and structure were investigated. Silicon atoms local surrounding specificity and electronic structure probing of studied powders were performed with the use of synchrotron ultrasoft X-ray absorption near edge structure spectroscopy technique. Noticeable changes in surface composition and structure are observed. The air-dried porous silicon nanoparticles were characterized by the presence of a thick surface oxide layer, while the presence of unoxidized silicon atoms at a depth of less than 3 nm was demonstrated for the lyophilized ones.