State Key Laboratory of Pulp and Paper Engineering, Guangdong Engineering Technology Research and Development Center of Specialty Paper and Paper-Based Functional Materials , South China University of Technology , Guangzhou 510640 , China.
Langmuir. 2019 Apr 9;35(14):4834-4842. doi: 10.1021/acs.langmuir.8b04259. Epub 2019 Mar 28.
Flexible and highly sensitive humidity sensors are crucial for humidity detection. In this study, a flexible cellulose nanofiber/carbon nanotube (NFC/CNT) humidity sensor with high sensitivity performance was developed via fast vacuum filtration. CNTs were well dispersed in water by using 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized NFC as a dispersant. More importantly, NFC also acted as a humidity sensitive material, achieving superior performance of NFC/CNT humidity sensors. The obtained NFC/CNT humidity sensor with 5 wt % CNT loading exhibits outstanding sensitive performance, and its response value reaches a maximum of 69.9% (Δ I/ I) at 95% relative humidity (RH). It also displays good bending resistance and long-term stability. In addition, the NFC/CNT humidity sensor was employed to monitor human breath. Therefore, we believe that the flexible, highly sensitive, and simply designed NFC/CNT humidity sensor is a promising candidate for various applications in the field of humidity measurement.
灵活且高灵敏度的湿度传感器对于湿度检测至关重要。本研究通过快速真空过滤制备了一种具有高灵敏度性能的纤维素纳米纤维/碳纳米管（NFC/CNT）湿度传感器。TEMPO 氧化的 NFC 用作分散剂可使 CNT 在水中得到良好的分散。更为重要的是，NFC 还可用作湿度敏感材料，从而实现了 NFC/CNT 湿度传感器的卓越性能。所获得的 NFC/CNT 湿度传感器在 CNT 负载量为 5wt%时表现出优异的敏感性能，在 95%相对湿度（RH）下其响应值达到最大值 69.9%（ΔI/I）。它还具有良好的耐弯曲性和长期稳定性。此外，NFC/CNT 湿度传感器可用于监测人体呼吸。因此，我们相信，这种灵活、高灵敏度且设计简单的 NFC/CNT 湿度传感器是湿度测量领域中各种应用的有前途的候选者。
