Polymorphism and Formation Mechanism of Nanobipods in Manganese Sulfide Nanocrystals Induced by Temperature or Pressure
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- 作者：Xinyi Yang ; Yingnan Wang ; Kai Wang ; Yongming Sui ; Meiguang Zhang ; Bing Li ; Yanming Ma ; Bingbing Liu ; Guangtian Zou ; Bo Zou
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：February 9, 2012
- 年：2012
- 卷：116
- 期：5
- 页码：3292-3297
- 全文大小：431K
- 年卷期：v.116,no.5(February 9, 2012)
- ISSN：1932-7455
文摘
Manganese sulfide (MnS) nanocrystals (NCs) with three different phases were synthesized by one-pot solvent thermal approach. The crystal structures and morphologies were investigated using powder X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy. We found that the crystal structure and morphology of MnS NCs could be controlled by simply varying the reaction temperature. The detailed growth process of MnS nanobipods, including the zinc blende (ZB)-core formation and wurtzite (WZ)-arms growth, provides direct experimental evidence for the polymorphism model. Furthermore, we have studied the stability of metastable ZB- and WZ-MnS NCs under high pressure and found that ZB-nanoparticles and ZB/WZ-nanobipods are stable below their critical pressure, 5.3 and 2.9 GPa, respectively. When pressures exceed the critical point, all these metastable MnS NCs directly convert to the stable rock salt MnS.