石英晶体微天平
材料科学
扫描电子显微镜
接触角
乙基纤维素
相对湿度
瓜尔胶
湿度
化学工程
傅里叶变换红外光谱
分析化学(期刊)
色谱法
复合材料
吸附
聚合物
有机化学
化学
物理
工程类
热力学
生物化学
作者
Weiyu Yan,Dongzhi Zhang,Xiaohua Liu,Xiaoya Chen,Chunqing Yang,Zhanjia Kang
标识
DOI:10.1021/acsami.2c08434
摘要
In this work, the guar gum (GG) and the electrospinned ethyl cellulose-polyvinyl pyrrolidone (EC-PVP) nanofibers were used as humidity-sensitive materials for fabricating a quartz crystal microbalance (QCM) sensor. Fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle test, and X-ray photoelectron spectra were used to characterize the synthesized GG/EC-PVP composite material, confirming its successful preparation and good hydrophilicity. The humidity sensitivity experiments were performed at room temperature. The GG/EC-PVP-coated QCM sensor has high sensitivity (55.72 Hz/%RH) and low hysteresis (2.8% RH) in a wide relative humidity range (0-97% RH), short response/recovery time (26/2 s), excellent selectivity, good repeatability, and stability. The combined action of hydrophilic groups and porous structure enhances the humidity sensitivity. The GG/EC-PVP sensor can be used to capture and measure typical breathing patterns in different human basic emotions due to its good performance. Furthermore, a lie-detector system was also designed for judging the lying through detecting the emotional breathing pattern of the subjects.
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