基于多角度动态退偏振光散射的短碳纳管测量

Measurement of Short Carbon Nanotubes Based on Multi-angle Dynamic Depolarized Light Scattering

基于多角度动态退偏振光散射的短碳纳米管测量方法,通过对不同散射角度下测得的结果进行线性拟合,减少了角度不准确产生的误差,改善了测量系统的重复性.研究了多角度动态光散射测量短碳纳管基本原理,搭建实验测量系统,并基于光子计数卡以LabVIEW为平台开发了信号采集和处理系统,采用标准短碳纳米管溶液对本测量方法进行了标定测试.在散射角为90°、100°、110°、120°、130°和150°下对标准短碳纳米管样品的直径和长度进行了测量,并且将测量结果与单角度(90°)测量法进行了比较.实验结果表明:直径和长度的多角度动态退偏振光散射法测量重复性误差分别为6.27%和6.36%,小于单角度测量法的重复性误差(13.22%和12.45%).

A measurement method of short carbon nanotubes by multi-angle depolarized dynamic light scattering is developed to reduce the measurement error from the inaccuracy of the scattering angle by linear fitting of the results at different angles.And the reproducibility of the measurement system is improved by this new method as well.The principle of multi-angle dynamic light scattering measurement of short carbon nanotube is studied,and an experimental measurement system is set up.The signal collecting and processing system is developed by LabVIEW based on a photon counting.The Calibration test is carried out by standard short carbon nanotubes suspensions.The measurement results of the diameter and the length of the samples at 90°,100°,110°,120°,130°and 150°are compared with that at the single angle（i.e.90°）.It shows that the repeatability error of the diameter and the length measured by the multi-angle depolarized dynamic light scattering method are 6.27%and 6.36%respectively,and better than those of the single angle method（i.e.13.22 % and 12.45 %）.