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Solid-State and Nanoparticle Synthesis of EuSxSe1–x Solid Solutions
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-11 00:00:00 , DOI: 10.1021/acs.chemmater.8b00393 Haydee A. Dalafu 1 , Nicholas Rosa 1 , Derak James 1 , Dane Romar C. Asuigui 1 , Michael McNamara 1 , Akira Kawashima 2 , Shun Omagari 2 , Takayuki Nakanishi 3 , Yasuchika Hasegawa 2 , Sarah L. Stoll 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-11 00:00:00 , DOI: 10.1021/acs.chemmater.8b00393 Haydee A. Dalafu 1 , Nicholas Rosa 1 , Derak James 1 , Dane Romar C. Asuigui 1 , Michael McNamara 1 , Akira Kawashima 2 , Shun Omagari 2 , Takayuki Nakanishi 3 , Yasuchika Hasegawa 2 , Sarah L. Stoll 1
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Europium chalcogenide alloys, EuSxSe1–x, have been synthesized both in the solid-state and as colloidal nanoparticles; the composition, structure, magnetism, and optical band gaps have been characterized. The goal was to observe the consequences of selenium concentration on the electronic structure as evidenced by the optical and magnetic properties and whether these properties are maintained in the nanomaterials. Both solid-state and nanoparticle alloys obey Vegard’s law with a systematic change in cell constant as confirmed by the powder X-ray diffraction. The bulk materials form homogeneous alloys that exhibit a linear change in both magnetic and optical properties as a function of composition. A synthetic method to prepare nanoalloys with a wide range of S:Se ratio has been developed. The nanoalloys are homogeneous, and EDS mapping of single nanoparticles indicates relatively uniform S and Se composition across the nanocrystals. The magnetic properties of the nanoparticles appear to parallel those in the solid-state. Although the composition is an effective tool to tune to the optical band gap in the solid-state alloys with a linear change in Eg with composition, the nanoparticle optical band gaps appeared to be shifted, which we attribute to the presence of an amorphous selenium phase. The study of the properties of colloidal alloys highlights the importance of the mechanism of nanoparticle formation to control composition and purity.
中文翻译：
EuS x Se 1– x固溶体的固态和纳米颗粒合成
cha硫属元素合金，EuS x Se 1– x，已经以固态和胶体纳米颗粒的形式合成；已经对组成，结构，磁性和光学带隙进行了表征。目的是观察硒的浓度对电子结构的影响，如光学和磁学性质所证明的，以及纳米材料中是否保留了这些性质。固态和纳米粒子合金均遵循Vegard定律，并通过粉末X射线衍射证实了细胞常数的系统性变化。块状材料形成均质合金，该均质合金显示出磁性和光学性质随组成变化的线性变化。已经开发了一种制备具有宽S：Se比范围的纳米合金的合成方法。纳米合金是均质的 单个纳米颗粒的EDS和EDS谱图表明，整个纳米晶体中的S和Se组成相对均匀。纳米粒子的磁性能似乎与固态的磁性能平行。尽管该成分是调整固态合金中光学带隙并使其线性变化的有效工具。È克用组合物，所述纳米颗粒的光学带隙似乎被移位，我们归因于无定形硒相的存在。对胶体合金性能的研究突显了纳米颗粒形成机理对控制组成和纯度的重要性。
更新日期：2018-04-11
中文翻译：
EuS x Se 1– x固溶体的固态和纳米颗粒合成
cha硫属元素合金，EuS x Se 1– x，已经以固态和胶体纳米颗粒的形式合成；已经对组成，结构，磁性和光学带隙进行了表征。目的是观察硒的浓度对电子结构的影响，如光学和磁学性质所证明的，以及纳米材料中是否保留了这些性质。固态和纳米粒子合金均遵循Vegard定律，并通过粉末X射线衍射证实了细胞常数的系统性变化。块状材料形成均质合金，该均质合金显示出磁性和光学性质随组成变化的线性变化。已经开发了一种制备具有宽S：Se比范围的纳米合金的合成方法。纳米合金是均质的 单个纳米颗粒的EDS和EDS谱图表明，整个纳米晶体中的S和Se组成相对均匀。纳米粒子的磁性能似乎与固态的磁性能平行。尽管该成分是调整固态合金中光学带隙并使其线性变化的有效工具。È克用组合物，所述纳米颗粒的光学带隙似乎被移位，我们归因于无定形硒相的存在。对胶体合金性能的研究突显了纳米颗粒形成机理对控制组成和纯度的重要性。
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