To the best of our knowledge, the preparation alumina
nanofibers with average diameters of less than 100 nm using
the electrospinning technique has rarely been reported. In most
of the previous research on the sol–gel method [23–26,32,33],
the electropinning sol used ethanol or ethanol/water as a
solvent, and the average diameter of the resultant alumina
nanofibers exceeded 100 nm