缺陷对石墨烯量子点的光学和电子性能的影响:密度函数理论研究研究
Wei Liu1, Yaning Han1, Min Liu1
1Department of Optical Engineering, College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University Hangzhou Zhejiang 311300 P. R. China jingxu@zafu.edu.cn.
RSC advances
|June 2, 2023
概括
石墨烯量子点 (GQD) 的缺陷显著改变了它们的结构,电子和光学特性. 了解这些缺陷影响是开发新的GQD应用程序的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 量子化学 是一个量子化学.
- 纳米技术 纳米技术
背景情况:
- 石墨烯量子点 (GQD) 具有独特的电子和光学特性.
- 已知缺陷会影响纳米材料的性能.
- 对GQD中缺陷影响的系统研究对其应用至关重要.
研究的目的:
- 为了研究各种缺陷 (空缺,石英威尔士,异质原子兴奋剂) 和度对GQD属性的影响.
- 了解由缺陷引起的结构扭曲如何影响电子和光学特征.
- 通过缺陷工程来为定制GQD属性提供指导.
主要方法:
- 使用了时间依赖密度函数理论 (TD-DFT) 的计算.
- 分析了原始和有缺陷的GQD的结构,电子和光学特性.
- 分析包括吸收光谱,HOMO-LUMO差距和NTO分析.
主要成果:
- 缺陷导致结构扭曲,随着度的增加而增加.
- 与原始的GQD C96.6相比,有缺陷的GQD在吸收光谱中显示蓝色转移 (单个缺陷) 或红色转移 (双重缺陷).
- 在有缺陷的GQD中,HOMO-LUMO差距显著减少,表明电子特性发生了变化.
结论:
- 缺陷的类型,度和位置决定了GQD的电子和光学性能.
- 结构扭曲和改变的轨道杂交导致有缺陷的GQD中电子定位增加.
- 这些发现为各种应用程序的缺陷控制GQD设计提供了洞察力.
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