• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Synthesis of Colloidal WSe2 Nanocrystals: Polymorphism Control by Precursor-Ligand Chemistry
【24h】

Synthesis of Colloidal WSe2 Nanocrystals: Polymorphism Control by Precursor-Ligand Chemistry

机译：胶体WSE2纳米晶体的合成：前体 - 配体化学的多态性对照

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Syntheses of transition-metal dichalcogenides (TMDs) using colloidal-chemistry approaches are gaining significant interest in recent years, as these methods enable the morphology and properties of the nanocrystals to be tuned for targeted applications. In this work, by only varying the ligand used during synthesis, we synthesized nanoflowers with oleic acid (OA) and 1T′ phase dominated WSe_(2) nanosheets with oleylamine (OLA). WSe_(2) nanocrystals show slower rate of formation for the metastable 1T′ phase. Surface chemistry analyses of the synthesized nanocrystals by solution NMR establish that neither of the ligands bind strongly to the surface of nanocrystals but are in a dynamic coordination with the WSe_(2) surface. A further examination of the coordination of tungsten hexacarbonyl (W(CO)_(6)) with the respective ligands confirms that W(CO)_(6) decomposes in OA, losing its octahedral symmetry, which leads to fast reactivity in the flask. In contrast to this, W(CO)_(6) reacts with OLA to form a new complex, which leads to slower reactivity and crystallization of the synthesized nanocrystals in the octahedral 1T′ phase. These insights into the influence of precursor-ligand chemistry on reaction outcome and the peculiar surface chemistry of colloidal TMD nanocrystals will be instrumental in developing future colloidal TMD nanocrystals.
机译：近年来，利用胶体化学方法合成过渡金属二醇化物（TMD）引起了人们的极大兴趣，因为这些方法可以调整纳米晶体的形态和性质，以用于有针对性的应用。在这项工作中，我们仅通过改变合成过程中使用的配体，合成了油酸（OA）纳米花和油酸胺（OLA）1T′相主导的WSe_2纳米片。WSe_2纳米晶的亚稳1T′相形成速度较慢。通过溶液NMR对合成的纳米晶体进行的表面化学分析表明，两种配体均未与纳米晶体表面紧密结合，而是与WSe_2表面处于动态配位状态。对六羰基钨（W（CO）（6））与相应配体的配位的进一步研究证实，W（CO）（6）在OA中分解，失去其八面体对称性，从而导致烧瓶中的快速反应性。与此相反，W（CO）6与OLA反应形成新的络合物，导致合成的纳米晶体在八面体1T′相的反应性和结晶速度变慢。这些关于前体配体化学对反应结果的影响以及胶体TMD纳米晶体的特殊表面化学的见解将有助于开发未来的胶体TMD纳米晶体。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号