Bonding structure in amorphous carbon nitride: A spectroscopic and nuclear magnetic resonance study
Bonding structure in amorphous carbon nitride: A spectroscopic and nuclear magnetic resonance study
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DOI：
10.1063/1.1380998
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发表时间：
2001-06
影响因子：
3.2
通讯作者：
J. C. Sánchez-López;C. Donnet;F. Lefebvre;C. Fernández-Ramos;Arnaud Fernandez
中科院分区：
文献类型：
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作者：
J. C. Sánchez-López;C. Donnet;F. Lefebvre;C. Fernández-Ramos;Arnaud Fernandez
自从 Liu 和 Cohen [Science 245, 841 (1989)] 预测结晶 β-C3N4 潜在的非凡机械性能以来，许多作者尝试了它的合成。然而，在大多数情况下，获得的材料是具有复杂键结构的非晶相。由于缺乏参考化合物、缺乏长程有序以及对其键合结构了解甚少，它们的表征非常复杂。在本文中，我们介绍了 1H、13C 和 15N 固态核磁共振 (NMR) 测量，用于确定非晶 CNx 薄膜中的键合类型。 NMR 测量不需要长程有序，并且能够清楚地识别来自 sp2 键合相和 sp3 键合相的信号。基于 NMR 获取的信息，对同一样品上通过其他表征技术（例如红外光谱、X 射线光电子能谱、电子能量损失光谱和 X 射线吸收近边光谱）获得的数据进行分析，能够描述由直流磁控溅射制备的所研究的非晶 CNx 相的结构模型，并修正在 自从 Liu 和 Cohen [Science 245, 841 (1989)] 预测结晶 β-C3N4 潜在的非凡机械性能以来，许多作者尝试了它的合成。然而，在大多数情况下，获得的材料是具有复杂键结构的非晶相。由于缺乏参考化合物、缺乏长程有序以及对其键合结构了解甚少，它们的表征非常复杂。在本文中，我们介绍了 1H、13C 和 15N 固态核磁共振 (NMR) 测量，用于确定非晶 CNx 薄膜中的键合类型。 NMR 测量不需要长程有序，并且能够清楚地识别来自 sp2 键合相和 sp3 键合相的信号。基于信息采集，对同一样品通过其他表征技术（如红外光谱、X 射线光电子能谱、电子能量损失光谱和 X 射线吸收近边光谱）获得的数据进行分析...
Since the prediction of Liu and Cohen [Science 245, 841 (1989)] of the potential extraordinary mechanical properties of crystalline β-C3N4, many authors have attempted its synthesis. However, in most cases, the obtained materials are amorphous phases with a complex bonding structure. Their characterization is complicated due to the absence of a reference compound, the lack of long-range order, and the poor knowledge about their bonding structure. In this article, we present 1H, 13C, and 15N solid-state nuclear magnetic resonance (NMR) measurements for the determination of the bonding types in amorphous CNx films. NMR measurements do not require long-range order and are able to clearly identify the signals from the sp2- and sp3-bonded phases. The analysis of the data obtained by other characterization techniques, such as infrared spectroscopy, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, and x-ray absorption near-edge spectroscopy on the same sample, based on the information acquired by NMR, enables the description of a structure model for the studied amorphous-CNx phase prepared by dc-magnetron sputtering and to revise the interpretation found in the literature.Since the prediction of Liu and Cohen [Science 245, 841 (1989)] of the potential extraordinary mechanical properties of crystalline β-C3N4, many authors have attempted its synthesis. However, in most cases, the obtained materials are amorphous phases with a complex bonding structure. Their characterization is complicated due to the absence of a reference compound, the lack of long-range order, and the poor knowledge about their bonding structure. In this article, we present 1H, 13C, and 15N solid-state nuclear magnetic resonance (NMR) measurements for the determination of the bonding types in amorphous CNx films. NMR measurements do not require long-range order and are able to clearly identify the signals from the sp2- and sp3-bonded phases. The analysis of the data obtained by other characterization techniques, such as infrared spectroscopy, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, and x-ray absorption near-edge spectroscopy on the same sample, based on the information acquire...