Functionalization of multiwalled carbon nanotubes (MWCNTs) with amine group using 4,4′-diaminodiphenyl sulfone (DDS) is achieved after carboxylation of pure MWCNTs (p-MWCNTs). p-MWCNTs, a-MWCNTs (acid functional MWCNTs) and f-MWCNTs (amine functional MWCNTs) were used to fabricate their nanocomposite with PMMA. A comparative study of the humidity characteristics of p-MWCNTs/PMMA, a-MWCNTs/PMMA and f-MWCNTs/PMMA-based capacitive humidity sensors was carried. f-MWCNTs/PMMA-based capacitive humidity sensor shows low hysteresis loss (5%), good response recovery behavior and highest sensitivity (S ~ 9736%) among all the studied composites. The maximum capacitance drift under different relative humidity was 1%RH.

在纯MWCNT（p-MWCNT）羧化后，使用4,4'-二氨基二苯砜（DDS）对具有胺基的多壁碳纳米管（MWCNT）进行功能化。p-MWCNTs，a-MWCNTs（酸官能团MWCNTs）和f-MWCNTs（胺官能团MWCNTs）被用来与PMMA制备纳米复合材料。对基于p-MWCNTs / PMMA，a-MWCNTs / PMMA和基于f-MWCNTs / PMMA的电容式湿度传感器的湿度特性进行了比较研究。在所有研究的复合材料中，基于f-MWCNTs / PMMA的电容式湿度传感器显示出低磁滞损耗（5％），良好的响应恢复行为和最高灵敏度（S〜9736％）。不同相对湿度下的最大电容漂移为1％RH。