Simple preparation of hierarchical Mn-doped WO3 with hollow structure for sensitive and selective TEA detection

The intrinsic property of WO 3 determines that it has stronger interaction with triethylamine (TEA), which makes the WO 3 sensing material to be an ideal TEA detector. In order to further improve the sensing performance of WO 3 gas sensors, a novel synthesis and modification method was proposed to fabricate Mn-doped WO 3 nanostructure. The unique structure of Mn/WO 3 was assembled by ultrathin nanosheets into hierarchical hollow fibers. Compared with the pristine WO 3 with similar structure, the Mn/WO 3 gas sensor shows greatly enhanced TEA sensing properties. The improvement of gas sensing performance of Mn/WO 3 should be due to the increase of oxygen vacancies and surface adsorbed oxygen after doping of Mn. Under the optimized preparing conditions, the Mn/WO 3 -500 sensor exhibits high sensing response (32 towards 50 ppm TEA), excellent selectivity, fast response-recovery speed and reliable repeatability and long-term stability at its optimal working temperature of 200 ℃. The superior TEA sensing performance of the Mn/WO 3 -500 sensor opens the door for potential applications in TEA recognition and detection.