Facile Hydrothermal Synthesis of SnO<sub>2</sub> Nanoflowers for Low-Concentration Formaldehyde Detection
Chao Xiang,
Tingting Chen,
Yan Zhao,
Jianhai Sun,
Kaisheng Jiang,
Yongzhen Li,
Xiaofeng Zhu,
Xinxiao Zhang,
Ning Zhang,
Ruihua Guo
Affiliations
Chao Xiang
State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen, Guangdong 518172, China
Tingting Chen
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, China
Yan Zhao
State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen, Guangdong 518172, China
Jianhai Sun
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, China
Kaisheng Jiang
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, China
Yongzhen Li
Institute of Urban Safety and Environmental Science, Beijing Academy of Science and Technology, Beijing 100054, China
Xiaofeng Zhu
Institute of Urban Safety and Environmental Science, Beijing Academy of Science and Technology, Beijing 100054, China
Xinxiao Zhang
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100194, China
Ning Zhang
State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen, Guangdong 518172, China
Ruihua Guo
Institute of Urban Safety and Environmental Science, Beijing Academy of Science and Technology, Beijing 100054, China
In this work, SnO2 nanoflowers were prepared by a simple one-step hydrothermal process. The morphology and structure of SnO2 nanoflowers were characterized by SEM, TEM, Raman spectroscopy, and XRD, which demonstrated the good crystallinity of the SnO2 tetrahedron structure of the as-synthesized materials. In addition, the sensing properties of SnO2 nanoflowers were studied in detail. It was found that the SnO2 nanoflower-based gas sensor exhibits excellent gas response (9.2 to 120 ppm), fast response and recovery (2/15 s to 6 ppm), good linearity of correlation between response (S) vs. concentration (C) (lgS = 0.505 lgC − 0.147, R2 = 0.9863), superb repeatability, and selectivity at 300 °C. The outstanding performance can also be attributed to the high specific surface area ratio and size of SnO2 nanoflowers close to the thickness of the electron depletion layer that can provide abundant active sites, promote the rate of interaction, and make it easier for gas molecules to diffuse into the interior of the material. Therefore, SnO2 nanoflowers can be an ideal sensing material for real-time monitoring of low-concentration HCHO.
