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The measurements of optical properties of various carbon and graphite particles in the wavelength from near-to far-infrared.

在近红外到远红外波长范围内测量各种碳和石墨颗粒的光学性质。

基本信息

批准号：
09640493
负责人：
KOIKE Chiyoe
金额：
$ 1.86万
依托单位：
Kyoto Pharmaceutical University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640493/
关键词：
infrared absorption carbon graphite crystallization spectral index far infrared He temperature カーボン系微粒子

项目摘要

This research aims at clearing the correlation between the optical properties and the general character for many kinds of various carbon and graphite particles in side wavelength region. The general character such as size, digress of crystallization of these particles were observed with TEM, These absorption's were measured in wide wavelength region from UV to far infrared. In far infrared, the spectral index βdepends on the degree of crystallization. The βincreases gradually from 0.6 to 3.0 as the degree of crystallization becomes good from carbon of wrong crystallization to graphite of best crystallization. In the mid infrared region, there is no correlation between the spectral index and the degree of crystallization, which might be due to large deviation of size of microcrystallites of carbon samples synthesized by different method. Under controlling the gas (He, Ar) pressure, the size of microcrystallites of carbon was controlled. In this case of carbon, the spectral index βdepends on the degree of crystallization in mid infrared region, that is, theβincrease from 0.6 to 1.2 as the average size of microcrystallites increases 6Åto 8Å.Cooled to He temperature, the spectral index of carbon becomes larger than that at room temperature and the crystallization become good. As for graphite cooled to He temperature, the crystallization become good for the wrong crystallization of graphite, but there is no change in the good crystallization of graphite.

本研究旨在明确多种不同种类的碳和石墨颗粒在边波长区的光学性质与共性之间的相关性。用透射电子显微镜观察了它们的大小、结晶偏向等共性，并测量了它们在从紫外到远红外的宽波长范围内的吸收。在远红外中，光谱指数β取决于结晶度。随着结晶度的提高，β从0.6逐渐增加到3.0，从错误结晶度的碳到最佳结晶度的石墨。在中红外波段，光谱指数与结晶度之间没有相关性，这可能是由于不同方法合成的碳微晶尺寸偏差较大所致。在控制气体(He、Ar)压力的条件下，控制了碳微晶的大小。在这种情况下，碳的光谱指数β依赖于中红外区域的结晶度，即随着微晶平均尺寸增加6Å到8Å，光谱指数从0.6增加到1.2，冷却到一定温度后，碳的光谱指数变大，结晶变好。对于冷却到He温度的石墨，结晶变得有利于石墨的错误结晶，但对石墨的良好结晶没有影响。