This work presents the fabrication steps and impedance spectroscopy characterization of WO3
nanofibers. This information allows us to see that the conduction channel in this nanofiber is still large, as
can be seen from a big difference between the bulk and the grain boundary resistances. Higher sensitivity
gas sensor; thus, could be achieved from an even smaller grain, which would allow the space charge layer
size to be larger as compared to the size of the particles in the nanofiber. Better understanding of
electronic structure of materials will allow more optimized synthesis conditions for nanofibers, which will
eventually lead to the production of high performance gas sensor