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Characteristics of distortion of bond length in glassy carbon nanocrystalline by Raman spectroscopy

机译：拉曼光谱法研究玻璃态纳米碳中键长的畸变特征

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摘要

Bond length (or lattice) distortion, crystallite size and crystal boundary structure are all important aspects in the research of nanocrystalline structure. A number of interesting works have been published concerning the effect of lattice distortionon the properties of nanocrystalline, but the studies of the characteristics of bond length or lattice distortion of nanocrystalline have not been specially reported. In this note, a new method analyzing bond length distortion in nanocrystalline by Ramanspectroscopy is given on the basis of Fitzer's formula about bond length of carbon bond. By this method, the most probable bond length (b_g), the average bond length (b_g), the bond length distortion (Δb_g) and the expansion rate of bond length (α) ofsp~2 bond in glassy carbon nanocrystalline can be measured. It is shown from the above research that probably distortion exists mostly in transitional layers of distorted bond length which is formed near crystallite boundary. Furthermore, the phenomenon of bond length expansion in the transitional layers is discussed from the electronic structure.
机译：键长（或晶格）畸变，微晶尺寸和晶体边界结构都是纳米晶体结构研究的重要方面。关于晶格畸变对纳米晶性能的影响，已经发表了许多有趣的著作，但是关于纳米晶的键长或晶格畸变特性的研究尚未特别报道。在此说明中，基于关于碳键键长的菲策公式，给出了一种通过拉曼光谱分析纳米晶体中键长畸变的新方法。通过这种方法，可以测量玻璃状碳纳米晶体中最可能的键长（b_g），平均键长（b_g），键长畸变（Δb_g）和sp〜2键的键长扩展率（α）。从上述研究表明，畸变可能主要存在于在晶体边界附近形成的键长变形的过渡层中。此外，从电子结构上讨论了过渡层中键长扩展的现象。

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