title: Surface Superoxide Complex Defects-Boosted Ultrasensitive ppb-Level NO2 Gas Sensors.
abstract: Sn(4+) -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 Sn(4+) -O2 (-•) centers with strong gas-adsorbing and high eletron-donating capability towards NO2 molecules decisively determine the sensor sensitivity.
authors.affiliation: 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.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Li
authors.affiliation: 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.
authors.forename: Baiyi
authors.initials: B
authors.lastname: Zu
authors.affiliation: 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.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Guo
authors.affiliation: College of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Li
authors.affiliation: 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.
authors.forename: Haibo
authors.initials: H
authors.lastname: Zeng
authors.affiliation: 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.
authors.forename: Xincun
authors.initials: X
authors.lastname: Dou
keywords: NO2 detection; SnO2 nanoflowers; gas sensors; ppb level; superoxide anions