• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Mn2+ ions incorporated into ZnSxSe1-x colloidal quantum dots: controlling size and composition of nanoalloys and regulating magnetic dipolar interactions
【24h】

Mn2+ ions incorporated into ZnSxSe1-x colloidal quantum dots: controlling size and composition of nanoalloys and regulating magnetic dipolar interactions

机译：MN2 +离子掺入ZnSXSe1-X胶体量子点中：控制纳米合金的尺寸和组成和调节磁性双极相互作用

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

A facile synthesis method is introduced how to prepare magnetically active ultraviolet emitting manganese ions incorporated into ZnSxSe1-x colloidal quantum dot (nanoalloy) at 110 degrees C in aqueous solutions. The reaction time is the main factor to control the hydrodynamic size from 3 to 10 nm and the precursor ratio is significant to tune the alloy composition. ZnS shell layer on the ZnSxSe1-x core was grown to passivate environmental effects. The nanoalloy has ultraviolet emission at 380 nm having a lifetime of 80 ns and 7% quantum yield. The incorporation of Mn2+ ions into the nanoalloys induced magnetic activity but did not modify the structure and photophysical properties of the nanoalloys. Colloidal and powdery samples were prepared and analyzed by electron paramagnetic resonance (EPR) spectroscopy. In the colloidal dispersions, EPR spectra showed hyperfine line splitting regardless of the Mn2+ ion fractions, up to 6%, indicating that Mn2+ ions incorporated into the nanoalloys were isolated. EPR signals of the powdery samples were broadened when the fraction of Mn2+ ions was higher than 0.1%. The EPR spectra were simulated to reveal the locations and interactions of Mn2+ ions. The simulations suggest that the Mn2+ ions are located on the nanoalloy surfaces. These findings infer that the magnetic dipolar interactions are regulated by the initial mole ratio of Mn/Zn and the physical state of the nanoalloys adjusted by preparation methods.
机译：本文介绍了一种简便的合成方法，即在110℃的水溶液中，将具有磁活性的紫外发射锰离子引入ZnSxSe1-x胶体量子点（纳米合金）中。反应时间是将流体力学尺寸控制在3～10nm的主要因素，前驱体比对调整合金成分有重要意义。在ZnSxSe1-x核上生长ZnS壳层以钝化环境效应。该纳米合金在380nm处具有紫外光发射，寿命为80ns，量子产率为7%。在纳米合金中加入Mn2+离子会引起磁性，但不会改变纳米合金的结构和光物理性质。制备胶体和粉末样品，并通过电子顺磁共振（EPR）光谱进行分析。在胶体分散体中，无论Mn2+离子的分数如何，EPR光谱都显示出超精细线分裂，高达6%，表明纳米合金中的Mn2+离子被分离。当Mn2+离子含量高于0.1%时，粉末样品的EPR信号变宽。通过对EPR谱的模拟，揭示了Mn2+离子的位置和相互作用。模拟结果表明，Mn2+离子位于纳米合金表面。这些发现表明，磁偶极相互作用受初始Mn/Zn摩尔比和制备方法调整的纳米合金物理状态的调节。

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