Honeycombed SnO2 with ultra sensitive properties to H2

Honeycombed SnO2 is synthesized by a simple wet chemical method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and N2 adsorption–desorption isotherms. The porous diameter of the honeycombed SnO2 is about 2 μm. Sensing investigation reveals that the obtained SnO2 with a very small BET surface area (19.7 m2 g−1) owns ultra sensitive properties to H2 at 340 °C. The response is 8.4 when the sensors are exposed to 1 ppm H2, and the response and recovery times are 4 and 10 s, respectively. The theoretical model for the infection of porous diameter on the sensing properties is provided.