journal article·2021-11-10

NiWO4 Microflowers on Multi-Walled Carbon Nanotubes for High-Performance NH3 Detection

Min Yang, Christian Au, Guowei Deng, Shaurya Mathur, Qiuping Huang, Xiaolan Luo, Guangzhong Xie, Huiling Tai, Yadong Jiang, Chunxu Chen, Zheng Cui, Xiaoyang Liu, Chaozheng He, Yuanjie Su, Jun Chen

ACS Applied Materials & Interfaces· Volume 13· Issue 44
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Abstract

NiWO4 microflowers with a large surface area up to 79.77 m2·g–1 are synthesized in situ via a facile coprecipitation method. The NiWO4 microflowers are further decorated with multi-walled carbon nanotubes (MWCNTs) and assembled to form composites for NH3 detection. The as-fabricated composite exhibits an excellent NH3 sensing response/recovery time (53 s/177 s) at a temperature of 460 °C, which is a 10-fold enhancement compared to that of pristine NiWO4. It also demonstrates a low detection limit of 50 ppm; the improved sensing performance is attributed to the porous structure of the material, the large specific surface area, and the p–n heterojunction formed between the MWNTs and NiWO4. The gas sensitivity of the sensor based on daisy-like NiWO4/MWCNTs shows that the sensor based on 10 mol % (MWN10) has the best gas sensitivity, with a sensitivity of 13.07 to 50 ppm NH3 at room temperature and a detection lower limit of 20 ppm. NH3, CO2, NO2, SO2, CO, and CH4 are used as typical target gases to construct the NiWO4/MWCNTs gas-sensitive material and study the research method combining density functional theory calculations and experiments. By calculating the morphology and structure of the gas-sensitive material NiWO4(110), the MWCNT load samples, the vacancy defects, and the influence law and internal mechanism of gas sensitivity were described.
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Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Advanced Chemical Sensor Technologies · Analytical Chemistry and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University, Chengdu 611130, China

State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China

Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States

State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China

Institute of Environmental and Energy Catalysis, School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China

Funding

Jilin University · Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles · National Natural Science Foundation of China · Chengdu Normal University · Department of Bioengineering, University of California, Los Angeles

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