Abstract
A PANI/WO3@cotton thread-based flexible sensor that is capable of detecting NH3 at room temperature is developed here. A layer of WO3 with PANI nanoparticles can be deposited by in-situ polymerization. The morphology and structure of the specimens were investigated by utilizing TEM, SEM, XRD and FTIR. The sensing performance of the PANI/WO3@cotton sensors with different WO3 molar ratios to NH3 at room temperature was examined. The results show that the optimal sensor (10 mol% WO3) has a response of 6.0 to 100 ppm NH3, which is significantly higher than that of the sensors based on pristine PANI and other composites. The PANI/WO3@cotton sensor also displays excellent selectivity, gas response, and flexibility even at room temperature. The unique fiber structure, p-n heterojunction, and the increased protonation of PANI in the composites contribute to the enhanced sensing property.
摘要
本文研制了一种能在室温下检测NH3的PANI/WO3@棉线传感器. 采用原位聚合的方法用PANI包裹WO3, 并 用TEM、 SEM、 XRD和FTIR对样品的形貌和结构进行了研究. 研究了不同PANI 与WO3 摩尔比的PANI/WO3@棉线传感器在室温 对100 ppm氨气的传感性能, 结果表明, 最佳传感器(10 mol% WO3)对 100 ppm的NH3灵敏度为6.0, 明显高于纯PANI及其他复合材料. 此外, PANI/WO3@棉线传感器也显示出优异的选择性、灵敏性和柔韧性. 复合材料中独特的纤维结构、p-n异质结的形成以及PANI质子化程度的增加使得该传感器表现出优异的NH3传感性能.
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This work was supported by the National Natural Science Foundation of China (61471233).
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He M and Xie L designed and engineered the samples and performed the experiments; Luo G and Li Z performed the data analysis; Wright J revised the paper; Zhu Z conceived this study. All authors contributed to the general discussion. All authors have given approval to the final version of the manuscript.
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Meng He received her bachelor degree from Changchun Institute of Technology in 2016. Then she was continuing to pursue a master degree in Shanghai Polytechnic University and the University of Shanghai for Science and Technology. Her research focuses on the chemical gas sensors.
Lili Xie received her PhD degree in Shanghai Institute of Ceramics, Chinese Academy of Sciences (2005), where she worked on the synthesis, characterization and properties of molecular sieves. Since July 2005, she has been a lecturer in Shanghai Polytechnic University. She has published over 15 peer-reviewed journal papers so far and her main research interests are the gas sensing properties of inorganic nano-materials.
Zhigang Zhu received his PhD degree in Shanghai Institute of Ceramics, Chinese Academy of Sciences (2005), where he worked on functional materials and devices. In 2009–2012, he was a research associate at the University of Cambridge focusing on MEMS design and fabrication for biosensors. He became a Jinqiao Professor in Shanghai Polytechnic University in 2012, and joint Professor in the University of Shanghai for Science and Technology. He has published over 80 peer-reviewed papers so far and his main research interests are micro-/nano biosensors and chemical gas sensors.
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He, M., Xie, L., Luo, G. et al. Flexible fabric gas sensors based on PANI/WO3 p−n heterojunction for high performance NH3 detection at room temperature. Sci. China Mater. 63, 2028–2039 (2020). https://doi.org/10.1007/s40843-020-1364-4
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DOI: https://doi.org/10.1007/s40843-020-1364-4