Enhanced HS sensor based on electrospun mesoporous SnO nanotubes.

Hollow and filled, well-aligned electrospun SnO nanofibers as HS gas-sensing materials have been controllably synthesized with the adding of PVP and/or PAN, respectively. It seems that the use of sacrificial polymeric precursor (PAN) results in hollow nanofiber while PVP leads to pores in both cases. A comparison study reveals that an absolute enhancement in HS gas-sensing performance for the sensor made of hollow SnO nanofibers occurs over that of the filled counterpart. The improved gas sensing properties are mainly attributed to not only the sufficient diffusion channels for gas spreading but also a significant fraction of the atoms from both the inner and outer walls, as well as granular interfaces, participating in gas-sensing reaction. [ABSTRACT FROM AUTHOR]