拉曼光谱检测氧化纳米粒子的研究
Maria Dekermenjian1, Andreas Peter Ruediger2, Alexandre Merlen3
1INRS-EMT Varennes Canada maria.dekermenjian@inrs.ca.
RSC advances
|September 8, 2023
概括
氧化纳米颗粒的拉曼光谱显示,以前归因于MgO的常见峰值实际上来自表面氧化 (Mg(OH) 2). 化证实这些峰值是由于表面基团.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 频谱学是一种光谱学.
背景情况:
- 氧化 (MgO) 纳米粒子在各种应用中得到了广泛的研究.
- 拉曼光谱是一种用于表征材料的常见技术,包括MgO纳米粒子.
- 文献报道了MgO纳米粒子的强烈拉曼峰值,这与其晶体结构对第一阶模式的选择规则相矛盾.
研究的目的:
- 为了调查在氧化纳米粒子中报告的拉曼光谱的起源.
- 为了澄清在MgO纳米粒子文献中特定的拉曼峰值 (278厘米-1,445厘米-1) 的归因.
- 为了确定表面基和观察到的拉曼信号之间的明确联系.
主要方法:
- 拉曼光谱检测是在氧化物纳米粒子 (10 nm 到 300 nm) 上进行的.
- 在氧气大气中使用400°C的化过程.
- 频谱分析侧重于100厘米-1到3900厘米-1的范围,特别是在278厘米-1,445厘米-1和3700厘米-1.1左右.
主要成果:
- 在~278 cm-1和~445 cm-1的拉曼信号,以前被分配给MgO,被确定为来自表面氧化 (Mg(OH) 2) 层.
- 在O2中400°C的火导致3700cm−1区域 (OH组) 和278cm−1和445cm−1模式的模式消失.
- 这种因回火引起的光谱变化为将这些峰值与表面基存在联系起来提供了明确的标准.
结论:
- 通常报告的MgO纳米颗粒的强烈拉曼峰主要是由于表面Mg(OH) 2污染,而不是内在的MgO模式.
- 纳米粒子表面上OH组的存在与在278厘米-1和445厘米-1.1处观察到的拉曼模式直接相关.
- 这项研究完善了对氧化纳米颗粒的拉曼光谱的解释,强调了表面特征化的重要性.
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