石英晶体微天平
材料科学
纳米纤维
甲醛
复合数
纳米材料
吸附
化学工程
选择性
静电纺丝
纳米技术
聚合物
化学
复合材料
有机化学
催化作用
工程类
作者
Zhanjia Kang,Dongzhi Zhang,Tingting Li,Xiaohua Liu,Xiaoshuang Song
标识
DOI:10.1016/j.snb.2021.130299
摘要
This paper introduces a quartz crystal microbalance sensor (QCM) based on SnO2 NFs/PDA composite with multi-layer stacked fiber nanostructure, which possesses high sensitivity and selectivity to formaldehyde gas. SnO2 NFs/PDA composite was synthesized via electrospinning and further oxidative polymerization. The morphology and chemical compositions of the as-prepared composite nanomaterials were confirmed by a series of material characterization technologies. The QCM sensor based on SnO2 NFs/PDA nanomaterials exhibited excellent sensing characteristics over a wide range of formaldehyde concentration (0.5 − 50 ppm), such as high sensitivity (12.2 Hz/ppm), short response/recovery times (25 s/38 s), high linearity and selectivity. The frequency shift characteristics and electrical parameters of the prepared sensors were confirmed by impedance analysis. The adsorption mechanism of formaldehyde gas could be attributed to hydrogen bonding and the combination of aldehyde ammonia Schiff base interactions. This work indicated that SnO2 NFs/PDA based QCM possessed great potential in actual formaldehyde sensing, which provided a feasible solution for designing highly sensitive and selective formaldehyde sensor.
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