Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory

doi:10.6023/A12121014

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (03): 360-366.DOI: 10.6023/A12121014 Previous Articles Next Articles

Article

基于软硬酸碱理论的单分散中重稀土硫氧化物纳米板的可控合成

顾均, 丁祎, 柯俊, 张亚文, 严纯华

稀土材料化学及应用国家重点实验室北京大学-香港大学稀土材料和生物无机化学联合实验室北京大学化学与分子工程学院北京分子科学国家实验室北京 100871

投稿日期:2012-12-07 发布日期:2013-01-09
通讯作者: 张亚文,严纯华 E-mail:ywzhang@pku.edu.cn;yan@pku.edu.cn
基金资助:
项目受国家自然科学基金(Nos.21025101,21271011)资助.

Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory

Gu Jun, Ding Yi, Ke Jun, Zhang Yawen, Yan Chunhua

Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2012-12-07 Published:2013-01-09
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21025101, 21271011).

1. Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory.PDF(767KB)

Abstract

Based on the theory of hard and soft acids and bases, trivalent ions of middle and heavy rare earths belong to very hard acids, which possess weak affinity towards S^2- ions but strong affinity to O^2- ions. So it is difficult to synthesize middle and heavy rare earth oxysulfide nano-materials through the thermolysis method in high-boiling-point organic solvent. In this article, monodispersed oxysulfide nanoplates of Y, Eu, Gd, Er and Yb were synthesized through this thermolysis method we developed. Both sodium-doped and undoped rare earth oxysulfide nanoplates could be prepared, and the doping of sodium ions could promote the crystallization of the nanoplates. Rare earth acetylacetonates were used as metal precursors and H₂S gas as the sulfurizing reagent. The reactions were conducted in oleylamine at 280 ℃ for 1 hour. The thermogravimetric analysis of the precursor showed that the initial decomposition temperature of the rare earth acetylacetonates is about 200 ℃, which is much lower than that of rare earth oleates. The transmission electron microscopy observation and energy dispersive X-ray analyses of the intermediate products during the synthesis of the nanoplates showed that rare earth oxide nanoplates formed firstly at about 220 ℃, and these nanoplates transformed to oxysulfide nanoplates gradually during the temperature ramping period. Density functional theory calculation was used to compare the total free energy of the oxide and oxysulfide of different rare earth elements. According to this thermodynamical comparison, we concluded that, from light rare earths to heavy rare earths, higher chemical potential of sulfur is needed to obtain the oxysulfide rather than oxide. On one hand, H₂S gas has higher sulphurizing power than sulfur. On the other hand, a comparatively low reaction temperature favors the dissolving of H₂S in oleylamine. As a result, the chemical potential of sulfur in synthetic system could be effectively increased by using rare earth acetylacetonates as the precursors instead of rare earth oleates, and using H₂S gas as sulphurizing agent instead of sulfur, which made it possible to prepare middle and heavy rare earth oxysulfide nanoplates in oleylamine. Fluorescent measurements showed that as-synthesized Y₂O₂S:Eu nanoplates could emit red light under 251 nm ultraviolet light excitation. For Y₂O₂S:Eu nanoplates, the fluorescence life time was shorter and quantum yield was lower in comparison with the corresponding bulk counterpart, possibly due to its much higher portion of surface atoms as well as lower crystallinity.

Key words: rare earth oxysulfide, nanomaterial, liquid synthesis, density functional theory calculation, fluorescence

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Gu Jun, Ding Yi, Ke Jun, Zhang Yawen, Yan Chunhua. Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory[J]. Acta Chimica Sinica, 2013, 71(03): 360-366.

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基于软硬酸碱理论的单分散中重稀土硫氧化物纳米板的可控合成

Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory

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