Abstract
• High-performance acetone sensor of double-shelled Mn-SnO 2 was prepared. • The response of Mn-SnO 2 towards acetone was as high as 75. • Mn-SnO 2 sensing mechanism was also discussed. In this study, a simple method to fabricate Mn-doped SnO 2 double-shell nanofibers by electrospinning was presented. The results demonstrated that Mn-SnO 2 nanofibers were unique tube-in-tube structures and possessed a high response of 75 towards 100 ppm acetone, which was higher three times than that of pure SnO 2 . It was believed that the excellent gas sensing properties of the sensor were that Mn-dopant dramatically enhanced the percentage of the defect-related oxygen species. The promising hollow double-shell structure was beneficial to gas absorption and penetration of oxygen and acetone molecules by offering more active sites. Hence, the Mn-doped double-shell nanofibers exhibited a promising application prospect in efficient sensing material in the future.
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