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Porous SnO 2  has received widespread attention because of its special structure. We successfully prepared 3 D porous SnO 2  using carbon spheres as a template. Scanning electron microscopy (SEM) morphology characterization results show that with the increase of the calcination temperature (400 °C, 450 °C, 500 °C, 550 °C, 600 °C), the morphology of the 3 D porous SnO 2  surface has changed. And when the calcination temperature is 500 °C, the pore distribution on the sample surface is more uniform. The results of nitrogen adsorption showed that the sample obtained when the calcination temperature was 500 °C had the largest specific surface area (62.02 m 2 /g). Different samples were tested for gas sensitivity, and we found that as the calcination temperature increased, the sensitivity of the samples to formaldehyde first increased and then decreased. The sensitivity of 3 D porous SnO 2  calcined at 500 °C to 50 ppm formaldehyde is up to 27. The minimum concentration of formaldehyde is 0.5 ppm (sensitivity value is 2). Moreover, 3 D porous SnO 2  calcined at 500 °C has a fast response time (2 s), low working temperature (230 °C), good selectivity (the selection coefficient for formaldehyde is 6.74) and linearity. These excellent performances are mainly due to the uniform 3 D porous structure, large specific surface area and more oxygen vacancies on the surface, which make it a promising formaldehyde sensor material.

Influence of calcination temperature on the gas-sensing performance of 3D porous SnO 2 to formaldehyde