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具有可变氧含量的La2O3/CNFs@C核心外纳米粒子的组成和电子结构
Evgeniya V Suslova1, Alexander N Ulyanov1, Alexey P Kozlov1
1Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
Nanomaterials (Basel, Switzerland)
|November 24, 2023
概括
碳纳米片 (CNF) 上的兰氧化物 (La2O3) 纳米粒子被氧化,增加了La2O3含量并改变了电子结构. 这项研究揭示了材料组成和电子磁共振 (EPR) 光谱之间的联系.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 化学 化学 化学
背景情况:
- 核心外纳米结构为高级应用提供了独特的特性.
- 碳纳米片 (CNFs) 为稳定纳米粒子提供了一种多功能矩阵.
- 氧化是调整材料表面化学和电子性能的一个关键过程.
研究的目的:
- 为了合成和描述La2O3/CNFs@C核心外结构.
- 研究酸蒸汽氧化对La2O3/CNFs@C.的组成和电子结构的影响.
- 为了确定材料组成和电子磁共振 (EPR) 光谱之间的相关性.
主要方法:
- 在CNF矩阵上稳定La2O3纳米颗粒的合成.
- 图形化形成La2O3/CNFs@C核心外结构.
- 使用酸蒸汽进行受控的氧化.
- 热重力测量分析 (TGA) 和X射线光电子光谱 (XPS) 用于组合分析.
- 电子偏磁共振 (EPR) 光谱仪用于电子结构评估.
主要成果:
- 氧化增加了La2O3/CNFs@C_x样本中的氧气和La2O3含量与氧化持续时间.
- 在所有样本中检测到两种类型的偏磁中心 (局部和移动电子).
- 混合碳原子的sp2和sp3的比率,含氧的组和协调的La原子影响了EPR光谱.
结论:
- 酸蒸汽氧化有效地改变了La2O3/CNFs@C.的表面成分和电子特性.
- 在这些纳米材料的散装/表面组成和EPR光谱之间建立了新的相关性.
- 这些发现为通过受控氧化为特定应用量身定制纳米材料特性提供了洞察力.
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