Citation: Zheng Li, Bi Wenjie, Jin Zhao, Liu Shantang. Synthesis of hierarchical shell-core SnO₂ microspheres and their gas sensing properties[J]. Chinese Chemical Letters, ;2020, 31(8): 2083-2086. doi: 10.1016/j.cclet.2019.11.051 shu

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

Key Lab for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, China

stliu@wit.edu.cn

Received Date: 13 November 2019
Revised Date: 26 November 2019
Accepted Date: 29 November 2019
Available Online: 30 November 2019

Figures(4)

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 asprepared SnO₂ microspheres were 0.6-1 μm, 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 ℃, 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.
- SnO₂ microspheres,
- Hydrothermal,
- Shell-core,
- Hierarchical,
- Glucose,
- Urea
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Synthesis of hierarchical shell-core SnO₂ microspheres and their gas sensing properties