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WO3 nanocrystals: Synthesis and application in highly sensitive detection of acetone |
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| Authors: | Jichao ShiAuthor VitaeGujin HuAuthor Vitae Yan SunAuthor VitaeMing GengAuthor Vitae Jie WuAuthor VitaeYufeng LiuAuthor Vitae Meiying GeAuthor VitaeJunchao TaoAuthor Vitae Meng CaoAuthor VitaeNing DaiAuthor Vitae |
| Affiliation: | a National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, No. 500, Yutian Road, Shanghai 200083, PR China b Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, PR China c School of Material Science and Engineering, Shanghai University, Shanghai 200072, PR China |
| Abstract: | WO3 nanocrystals have been prepared by a sol-gel route and characterized by X-ray diffractometry, scanning electron microscopy, and transmission electron microscopy. The experimental results show that WO3 nanocrystals have a high crystallographic quality and a good dispersivity. The particles’ sizes are in the range of 25-100 nm. The fabricated WO3 nanocrystal-based sensors have an excellent sensitivity and selectivity to acetone, and display a rapid response and recovery characteristics. The developed sensors exhibit a detection limit down to 0.05 ppm at 300 °C, rendering a promising application in noninvasive diagnosis of diabetes. The response mechanism of the WO3 nanocrystal sensor to low concentration of acetone has been discussed based on the depletion layer model. |
| Keywords: | Sol-gel WO3 Nanocrystals Gas sensor Acetone |
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