Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 238, Issue -, Pages 264-273Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.07.051
Keywords
SnO2 microspheres; Hydrothermal synthesis; Gas sensor; Formaldehyde; Stability
Funding
- National Natural Science Foundation of China [51262029]
- Program for Excellent Young Talents, Yunnan University
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Tin oxide microspheres were successfully obtained through a facile hydrothermal method without any polymer templates or surfactant. The as-synthesized SnO2 microspheres are composed of large amount of small spheres with average diameters of about 250 nm, and every small sphere consists of numerous primary nanocrystallites with average sizes of about 8 nm. The resultant product was used as sensing material for gas sensor to detect the formaldehyde (HCHO) gas. The gas response, response and recovery time, selectivity and stability were carefully studied. It was found that the response value of the sensor to 100 ppm HCHO was 38.3 at the operating temperature of 200 degrees C. The gas sensor based on SnO2 micro spheres has excellent gas response, good response-recovery properties, linear dependence, repeatability and selectivity, making it to be a promising candidate for practical detectors for HCHO. (C) 2016 Elsevier B.V. All rights reserved.
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