ZIF-67 doped SnO2 and its derivative: Synthesis, structure, and triethylamine gas sensing performance

In this paper, pure SnO 2 and SnO 2 composite materials (ZSnO 2 ) modified with different amounts of ZIF-67 (20 mg, 60 mg) were synthesized utilizing a simple solvothermal method. The gas sensing performance of these sensitive materials was tested, and the results manifested that at a low operating temperature of 170 ℃, the responses of ZSnO 2 -60 and ZSnO 2 -20–50 ppm triethylamine (TEA) gas reached 142.6 and 83.7, respectively, which was ∼3.81 and ∼2.24 times that of pure SnO 2 (34.7). In addition, both doped samples had lower operating temperature, excellent selectivity and repeatability towards TEA gas. The doping of ZIF-67 led to oxygen vacancies increasing, specific surface area amplifying and p-n heterojunctions forming between Co 3 O 4 and SnO 2 in ZSnO 2 nanocomposites. These synergistic effects enhanced the gas sensitivity of ZSnO 2 nanocomposites to TEA gas.