Stable solid solution In2−xNixO3 nanofibers were formed by introducing p-type NiO into n-type In2O3
via an electrospinning technique with a subsequent calcination process. The nanofibers were characterized
by differential thermal and thermal gravimetric analyzer (DTA–TGA), scanning electron microscopy
(SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Ethanol sensing properties
of the as-prepared nanofibers were investigated in detail. In order to maintain the nanofibers’ onedimensional
morphologies in the sensor fabrication, a unique measurement technique was introduced
for the first time. The result showed that In2−xNixO3 nanofibers exhibited significantly enhanced sensitivity,
good selectivity, fast response and recovery rate (