Investigation of gas sensing materials tin oxide nanofibers treated by oxygen plasma

摘要

SnO_2 nanofibers were synthesized by electrospinning method, and then, treated by oxygen plasma. The morphology and structure of treated SnO_2 nanofibers were analyzed using XRD, SEM, and TEM. The composition and specific surface of treated SnO_2 nanofibers were analyzed by EDX, XPS, and BET. The treated SnO_2 nanofibers showed more pores on the surface of the nanofibers. The size of treated SnO_2 nanoparticles in the nanofibers are ~20 nm. The porosity of the treated SnO_2 nanofibers was higher than that of the untreated. The gas sensing properties of the SnO_2 nanofibers to formaldehyde were measured before and after materials treated by oxygen plasma. The treated SnO_2 nanofibers exhibit low operating temperature and large response values. Cross-responses of the treated SnO_2 nanofibers sensor were tested. The sensing mechanism of the SnO_2 nanofibers gas sensor treated by oxygen plasma was briefly analyzed.