Abstract
The ZnSnO3 microspheres were fabricated with water-soluble biopolymer sodium alginate (SA) as a crystal growth modifier under hydrothermal conditions. The gas-sensing properties of ZnSnO3@SA were tested under the illumination of UV light at room temperature. The results showed that the ZnSnO3@SA sensor exhibited better HCHO gas response than pristine ZnSnO3 sensor, which was ascribed to the introduction of SA that changed the size distribution of the microspheres. Test results of HCHO gas with different concentrations indicated that the ZnSnO3@SA sensor had a good linearity. This approach would provide a potential route for the HCHO sensor to work at room temperature. In addition, the sensing mechanism was also discussed.
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