Effect of Ce doping and MOF-derived structure on gas sensing performance of SnO₂ to ethylene glycol

In order to enhance the gas sensing performance of SnO2-based sensor, different content of 1,3,5-benzenetricarboxylic acid (BTC) and stannous sulfate with molar ratio 0.5:1, 1.5:1, 2:1 were used to prepare the metal-organic frameworks (MOFs), Sn-BTC, by solvothermal method, and then calcined at 500 degrees C for 3 h to obtain SnO2 derived from MOF structure. The results showed that SnO2-1.5 had the best gas sensing performance at the optimal operating temperature of 160 degrees C, the response value to 100 ppm ethylene glycol was 64.69 and the response/recovery time was 13/3 s, respectively. Meanwhile, in order to further improve the sensitivity, different content of cerium nitrate hexahydrate (0.25, 0.75, 1.25 mol%) were used to prepare Ce doped Sn-BTC-1.5 and then the derived SnO2 doped with Ce was obtained by calcination. The SnO2-Ce-0.75 sensor was tested to have a maximum response value of 132.90 at 160 degrees C and a response/recovery time of 165/7 s.