首先采用 TEMPO 氧化法制备纳米纤维素(NFC)，并将 NFC 作为碳纳米管(CNT) 的分散剂，通过超声和离心处理制备出稳定分散的 NFC/CNT 分散液;然后通过朗伯 － 比 尔定律测定离心处理后的 NFC/CNT 分散液的质量浓度，并利用原子力显微镜和 Zeta 电 位对 NFC/CNT 的分散效果做进一步表征;最后将制得的 NFC/CNT 分散液，通过真空抽 滤法制备出柔性 NFC/CNT 复合薄膜． 扫描电镜分析表明，所制备的薄膜具有多层有序结 构，并且 NFC 与 CNT 之间相互交织，形成网络结构． 拉曼光谱分析进一步表明，薄膜中的 NFC 与 CNT 之间存在氢键作用． NFC/CNT 复合薄膜的湿敏性能测试结果表明:不同含量 的 CNT 对复合薄膜的湿敏性能具有重要的影响，当 CNT 含量为 5% 时，复合薄膜在 95% 相对湿度条件下的灵敏度高达64%，线性度拟合系数为0．982，表现出优异的湿敏性能．

Nanocellulose (NFC) was firstly prepared by means of TEMPO oxidation method． NFC was used as a dispersant for dispersing carbon nanotubes (CNT) in water，and a stable and well-dispersed NFC/CNT suspension was prepared through ultrasonication and centrifugation treatment． Then the concentration of the centrifugally trea- ted NFC/CNT dispersion was measured by Lambert-Beer's law，and the dispersion effect of NFC/CNT was further characterized by atomic force microscope and Zeta potential． Finally，flexible NFC/CNT composite films were pre- pared with the obtained NFC/CNT dispersion by vacuum filtration method． Scanning electron microscopy analysis showed that the prepared films had a multi-layered ordered structure，and NFC and CNT were intertwined to form a network structure． Raman spectroscopy further indicates that hydrogen bonding exists between NFC and CNT in the composite film． The results of the humidity sensitive performance of the obtained NFC/CNT composite films show that CNT content has an important effect on the humidity sensitivity of the films． When the CNT content is 5%，the sensitivity value reaches 64% under 95% relative humidity，and the linearity fitting coefficient is 0. 982，indicating excellent humidity sensitive performance．