Synthesis of hierarchical shell-core SnO2 microspheres and their gas sensing properties

Using glucose and urea as structural guiding agents, hierarchical shell-core SnO2 microspheres were successfully synthesized via a facile hydrothermal method. The effect of the molar ratio of glucose and urea was investigated, and sensors based on the hierarchical shell-core SnO2 microspheres exhibi...

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Bibliographic Details
Published in:Chinese chemical letters 2020-08, Vol.31 (8), p.2083-2086
Main Authors: Zheng, Li, Bi, Wenjie, Jin, Zhao, Liu, Shantang
Format: Article
Language:English
Subjects:
Glucose
Hierarchical
Hydrothermal
Shell-core
SnO2 microspheres
Urea
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Summary:Using glucose and urea as structural guiding agents, hierarchical shell-core SnO2 microspheres were successfully synthesized via a facile hydrothermal method. The effect of the molar ratio of glucose and urea was investigated, and sensors based on the hierarchical shell-core SnO2 microspheres exhibited high sensitivity toward ethanol gas. [Display omitted] Using SnSO4, d-glucose, urea and water, hierarchical shell-core SnO2 microspheres were successfully synthesized via a simple hydrothermal method. The characterization results showed that the sizes of as-prepared SnO2 microspheres were 0.6–1μm, with shell thicknesses of 40−60 nm. The shell and large core of the SnO2 microspheres were all comprised of the same basic rice-like nanoparticles with diameters of 16−25 nm and lengths of 16−45 nm. Further investigaton showed that the glucose and urea served as structural guiding agents, and urea facilitated the formation of the hierarchical structure. The as-prepared SnO2 nanomaterials were used to fabricate a gas sensor with an electrode blade used for the gas sensitivity tests. The hierarchical shell-core SnO2 microspheres exhibited high sensitivity and selectivity toward ethanol, with a responsivity of 63.8 for 50 ppm ethanol at 250 °C, while the response and recovery time were 7 s and 28 s respectively. Moreover, the responsivity of the materials showed good linearity at ethanol concentrations from 500 ppb to 10 ppm. The simple synthetic method, environmentally-friendly raw materials, and excellent gas sensitivity demonstrate that the as-prepared SnO2 nanomaterial has great potential applications for the sensing of ethanol gas.
ISSN:1001-8417
1878-5964
DOI:10.1016/j.cclet.2019.11.051