Journal of Inorganic Materials >
Hydrothermal-sintering Preparation of Cr2+:ZnSe/ZnSe Nanotwins with Core-shell Structure
Received date: 2023-10-17
Revised date: 2023-11-21
Online published: 2024-04-25
Supported by
Key Research and Development Program of Shaanxi Province(2021GY-202)
National Natural Science Foundation of China(52072300)
National Natural Science Foundation of China(61874089)
Cr2+ doped ZnSe nanocrystals are an important type of mid-infrared materials. ZnSe-based semiconductor nanocrystals with core-shell structure have shown excellent optical, electrical and catalytic properties. The defects of nanocrystals are one of the important factors affecting their properties. For example, nanocrystals with twinned structure have higher strength and hardness. In order to improve the comprehensive performance of doped nanocrystals, Cr2+:ZnSe/ZnSe nanocrystals with core-shell structure were prepared by two-step hydrothermal processes, using soluble Zn salt as Zn source, newly prepared NaHSe solution as Se source, and Cr(AC)2 as doping source, and chemically stable nanocrystals at room temperature were obtained by sintering at 400 and 800 ℃ under protection of argon or high vacuum, respectively. Their structural and morphological characterization results show that the nanocrystalline size is mainly concentrated in the range of 20-30 nm, the shell thickness is about 2.6 nm, and the nanocrystals have delamination defects, thus twins are developed. The analysis results show that the twin plane is (111), the angle between the adjacent two crystal planes is 70.02°± 0.5°. The twin density of the sample increases with the increase of the crystallinity, which indicates that release of lattice distortion energy leads to formation of delamination and twin. Meanwhile, the twin growth can be explained by dislocation induced nucleation-growth. XPS analysis shows that Cr elements with a valence of +2 exist in the nanocrystals, and the reflection spectroscopy test shows that nanocrystals have an absorption band around 1775 nm, indicating that the prepared nanocrystals with twins have a promising mid-infrared luminescent property.
Key words: Cr2+:ZnSe; core-shell structure; nanotwins; twinning mechanism; sintering
Tingting ZHANG , Fangyuan WANG , Changyou LIU , Guorong ZHANG , Jiahui LÜ , Yuchen SONG , Wanqi JIE . Hydrothermal-sintering Preparation of Cr2+:ZnSe/ZnSe Nanotwins with Core-shell Structure[J]. Journal of Inorganic Materials, 2024 , 39(4) : 409 -415 . DOI: 10.15541/jim20230479
表1 不同温度烧结样品的(111)晶面参数Table 1 Parameters of (111) crystal planes of samples sintered at different temperatures |
Sample | T/℃ | 2θ/(°) | d/nm | FWHM/rad | D/nm |
---|---|---|---|---|---|
ZnSe | 200 | 27.455 | 0.3246 | 0.761 | 10.8 |
ZnSe/ZnSe | 400 | 27.472 | 0.3244 | 0.613 | 13.5 |
0.3%Cr2+:ZnSe/ZnSe | 400 | 27.465 | 0.3245 | 0.557 | 14.9 |
0.5%Cr2+:ZnSe/ZnSe | 400 | 27.451 | 0.3246 | 0.540 | 15.4 |
1.5%Cr2+:ZnSe | 800 | 27.207 | 0.3275 | 0.537 | 15.5 |
* T: Temperature; d: Interplanar distance; FWHM: Full width at half maximum; D: Average grain size |
感谢西北工业大学-南洋理工大学研究生交流项目的资助。感谢南洋理工大学于霆老师团队的帮助。
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