二氧化硅纳米颗粒与碳黑纳米颗粒红外漫反射光谱的测量与分析

用FTIR-FTS3000光谱仪和漫反射附件分别采集了二氧化硅纳米颗粒、炭黑纳米颗粒和二氧化硅纳米颗粒与碳黑纳米颗粒的不同配比的混合样品的红外漫反射光谱。通过对测量结果的分析，发现二氧化硅纳米颗粒的红外漫反射光谱较之体材料有蓝移和宽化现象，此现象可以用纳米粒子的小尺寸效应和量子尺寸效应来进行初步解释。而碳黑纳米颗粒因为其强吸光性的原因，实验中没有得到理想的光谱。混合样品中，碳黑纳米颗粒有一个最大吸收临界浓度，此时二氧化硅纳米颗粒与碳黑纳米颗粒的质量比是100∶20。在这个比例以内，碳黑纳米颗粒的特征峰位的F(R)函数与浓度符合朗伯-比尔定律。当碳黑纳米颗粒在体系中的含量超过这个比值，随着碳黑在体系中比例的增加，吸光度将不再增大。

Measurement and Analysis of Nanometer Particles of Silica and Carbon Black by Diffuse Reflection FTIR Spectra

By using FTIR-FTS3000 spectrometer and infrared diffuse reflection accessory,the spectra of the nanometer particles of silica,carbon black and their blends with different weight ratio were collected and characterized.It was found from the measured results that blue-shift and broadening phenomenon occurred in the nanometer particle materials in comparison with the mass ones.These phenomena could be explained by the little size effect and quantum size effect.No perfect spectrum could be collected because of the strong absorbance of the nanometer particle materials.For the blends of silica and carbon black there was a maximum absorption corresponding to the critical concentration,where the weight ratio of silica to carbon black was 100:20,and below this ratio the relationship between the function F(R) and the concentration obeyed Lambert-Beer's law.Above this ratio,the absorbance will not increase with increasing the proportion of the carbon black in the system.