Humidity sensor based on mesoporous Al-doped NiO ultralong nanowires with enhanced ethanol sensing performance

摘要

Mesoporous Al-doped NiO ultralong nanowires with better uniformity, dispersity and well-defined morphologies were synthesized by a simple surfactant based hydrothermal treatment of aqueous solution of Al(NO3)(3,) NiCl2 and NaC2O4 in the presence of ethylene glycol and polyethylene glycol through continuous open air heating at 500 degrees C. The sensing performances of the gas sensor's based on bare and Al-doped NiO nanowires had been investigated towards ethanol, methanol, acetone, xylene, toluene and benzene. The results specified that the 3.2 at% Al-doped NiO nanowires display better gas sensitivity characteristics as compare to that of undoped, 1.6 at%, 2.1 at% and 4.3 at% Al-doped NiO nanowires. It has been investigated that the sensitivity features were upgraded with an increment on Al concentration into the crystallites based on NiO nanowires. The assimilation of Al3+ ions within NiO crystals modifies the carrier concentration by inducing changes in the chemisorbed and deficient oxygen of NiO nanowires. Hence, the incorporation of Al3+ into NiO nanowires would be a capable way for scheming and devising significant gas sensors.