Communication

Surface Superoxide Complex Defects‐Boosted Ultrasensitive ppb‐Level NO₂ Gas Sensors

Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi, 830011 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Baiyi Zu

Corresponding Author

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

Yanan Guo

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Kun Li

College of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024 China

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Haibo Zeng

Corresponding Author

Institute of Optoelectronics and Nanomaterials, Herbert Gleiter Institute of Nanoscience, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

Xincun Dou

Corresponding Author

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

Yuxiang Li

University of Chinese Academy of Sciences, Beijing, 100049 China

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Baiyi Zu

Corresponding Author

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

Yanan Guo

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Kun Li

College of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024 China

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Haibo Zeng

Corresponding Author

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

Xincun Dou

Corresponding Author

E‐mail: byzu@ms.xjb.ac.cn, zeng.haibo@njust.edu.cn, xcdou@ms.xjb.ac.cn Search for more papers by this author

First published: 20 January 2016

https://doi.org/10.1002/smll.201503111

Citations: 32

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Abstract

Sn⁴⁺ –O₂^−• centers are intentionally created in SnO₂ nanoflowers by a thermodynamically instable synthetic process. The resulting SnO₂ nanoflower‐based sensor is confirmed to be the most sensitive ppb‐level chemiresistor NO₂ sensor to date. The Sn⁴⁺–O₂^−• centers with strong gas‐adsorbing and high eletron‐donating capability towards NO₂ molecules decisively determine the sensor sensitivity.