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166 results on '"Qu, Fengdong"'

27. A dimethyl disulfide gas sensor based on nanosized Pt-loaded tetrakaidecahedral α -Fe2O3 nanocrystals.

Author

Zhuang, Ziqin, Zhang, Li, Huang, Chaozhu, Wang, Xiaohang, Guo, Haichuan, Thomas, Tiju, Qu, Fengdong, Wang, Pei, and Yang, Minghui

Subjects
GAS detectors, METAL oxide semiconductors, ETHANES, PRECIOUS metals, FERRIC oxide, PLATINUM nanoparticles
Abstract

Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α -Fe2O3 nanoparticles and Pt-modified α -Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α -Fe2O3 nanomaterials, the Pt- α -Fe2O3 nanocomposite sensor shows a higher response value (R a/ R g = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt- α -Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor. [ABSTRACT FROM AUTHOR]

Published
2022
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28. Mesoporous WN/WO3-composite nanosheets for the chemiresistive detection of NO2 at room temperature

Author

Massachusetts Institute of Technology. Department of Chemical Engineering, Qu, Fengdong, He, Bo, Guarecuco, Rohiverth, Yang, Minghui, Massachusetts Institute of Technology. Department of Chemical Engineering, Qu, Fengdong, He, Bo, Guarecuco, Rohiverth, and Yang, Minghui

Abstract

Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO[subscript 3]) composites were prepared through a simple aqueous solution route followed by nitriding in NH[subscript 3], for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO[subscript 3]. The highest sensing response was up to 21.3 for 100 ppb NO[subscript 2] with a fast response time of ~50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO[subscript 2]: 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO[subscript 3] from 300 °C to room temperature, and the composites-based sensor presents good long-term stability for NO[subscript 2] of 100 ppb. Furthermore, a possible sensing mechanism is proposed. ©2016 Keywords: WN/WO3 composite; nanosheets; gas sensor; NO2; room temperature

Published
2020

42. Mesoporous WO3 modified by Au nanoparticles for enhanced trimethylamine gas sensing properties.

Author

Wang, Yunan, Zhang, Shendan, Huang, Chaozhu, Qu, Fengdong, Yao, Dong, Guo, Haichuan, Xu, Haohao, Jiang, Chunjie, and Yang, Minghui

Subjects
GOLD nanoparticles, TRIMETHYLAMINE, MESOPOROUS materials, GAS detectors, PRECIOUS metals, SURFACE area
Abstract

In this paper, KIT-6 is used as a template to prepare ordered mesoporous materials WO3 and Au-loaded WO3 (Au–WO3). The pristine WO3 sensor and the Au–WO3 sensor are fabricated for the detection of 19 important gases, such as trimethylamine, formaldehyde and CS2. The results show that the Au–WO3 sensor has better selectivity and higher response to TMA. At a working temperature of 268 °C, the response (Ra/Rg) of the Au–WO3 sensor to 100 ppm of TMA is 41.56 and the response time is 1 s. In addition, the sensor has excellent response/recovery capabilities and stability. These high sensing performances are mainly attributed to the electronic and chemical sensitization of the noble metal Au and the presence of a high specific surface area supported by the mesoporous structure. Therefore, Au-doped mesoporous WO3 should be a promising material for a high performance TMA gas sensor. [ABSTRACT FROM AUTHOR]

Published
2021
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