微晶
亚稳态
材料科学
结晶学
溶解度
透射电子显微镜
相(物质)
化学工程
化学
纳米技术
物理化学
有机化学
工程类
作者
Jun Lu,Pengfei Qi,Yiya Peng,Zhaoyu Meng,Zhiping Yang,Wenxin Yu,Yitai Qian
摘要
Metastable (β and γ) and stable (α) MnS crystallites were synthesized by solvothermal reaction in various solvents at 190−200 °C. In tetrahydrofuran and benzene, the metastable MnS crystallites can be obtained. In water, ammonia liquor, ethylenediamine, α-MnS, which is converted from the metastable phase, would be obtained. The low solubility of MnS is the crucial reason to stabilize the metastable phase with good yield. The metastable MnS crystallites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The metastable γ-MnS crystallites with rodlike morphology were found, and a unique "methane-like" four-branched rod cluster was characterized. The blue shift of the absorption edge indicates the quantum size effect of metastable MnS nanocrystallites.
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