Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190 (P. R. China).
Chem Asian J. 2013 Oct;8(10):2383-7. doi: 10.1002/asia.201300425. Epub 2013 Jun 26.
An unusual wurtzite phase of Cu2ZnGeSe4 (CZGSe) has been discovered and its corresponding nanocrystals (NCs) were synthesized by using a facile hot-injection solution-phase synthesis method. Moreover, the formation mechanism of this new phase of CZGSe, instead of the typically observed stannite structure, has been investigated in detail, which indicates that wurtzite CZGSe, which represents the kinetic phase, could be prepared by using a kinetic growth process without phase transformation into the thermodynamically stable stannite structure during the colloidal synthesis. In addition, the potential of wurtzite CZGSe as a thermoelectric material is demonstrated by characterizing the thermoelectric properties of as-synthesized wurtzite CZGSe NCs. This work allows for a rational manipulation of the NCs with a desired crystal structure through adjusting the thermodynamics and kinetics without using any additives and, because of its simplicity and versatility, it may be extended to the phase-controlled synthesis of other chalcogenide NCs.
已发现 Cu2ZnGeSe4（CZGSe）的一种非寻常纤锌矿相，并通过简便的热注入溶液相合成方法合成了其相应的纳米晶体（NCs）。此外，详细研究了这种 CZGSe 的新相的形成机制，而不是通常观察到的白铁矿结构，这表明可以通过动力学生长过程来制备纤锌矿 CZGSe，而无需在胶体合成过程中发生相变进入热力学稳定的白铁矿结构。此外，通过对合成的纤锌矿 CZGSe NCs 的热电性能进行表征，证明了纤锌矿 CZGSe 作为热电材料的潜力。这项工作允许通过调整热力学和动力学来合理地操纵具有所需晶体结构的 NCs，而无需使用任何添加剂，并且由于其简单性和通用性，它可能会扩展到其他硫属化物 NCs 的相控合成。
