MXene/CNF复合气凝胶的制备及其湿敏性能研究

Preparation and Humidity Sensing Properties of MXene/CNF Composite Aerogels

关键词:  CNF  MXene  液氮定向冷冻  气凝胶  湿度传感器

Key Words:CNF  MXene  liquid nitrogen directional freezing  aerogel  humidity sensor

摘要:本研究将新型二维过渡金属碳氮材料（MXene）与纤维素纳米纤维（CNF）复合，通过液氮定向和非定向预冷冻方法，冷冻干燥后制备4种不同MXene/CNF复合气凝胶，探究加入不同类型CNF、MXene和采用不同液氮预冷冻方法对复合气凝胶形貌结构的影响。结果表明，定向单层MXene/TOCNF复合气凝胶形貌最为优异；对其制备的湿度传感器在相对湿度11%~97%的条件下进行了湿敏测试，发现在MXene质量分数10%、相对湿度97%的条件下，传感器响应值增大了3倍，说明传感器对于高湿度更为敏感，且该传感器在14天内基本稳定。

Abstract:In this study， the novel two-dimensional transition metal carbon and nitrogen material （MXene） was composited with cellulose nanofibers （CNF）， and four different kinds of CNF composite aerogel sensors were prepared after freeze-drying by the liquid nitrogen directional and non-directional pre-freezing methods. The impacts of various types of CNF and MXene， with different liquid nitrogen pre-freezing methods on the morphology and structure of the MXene/CNF composite aerogels were investigated. The results showed that the oriented monolayer MXene/TOCNF composite aerogel had the most excellent morphology. Additionally， the humidity sensitivity test was conducted at relative humidity levels ranging from 11%~97%. The results revealed a three times of increase in response value at relative humidity of 97% with MXene dosage of 10%， indicating superior sensitive of the sensor to high humidity. Furthermore， the sensors demonstrated overall stablility within 14 days.