Humidity sensing properties measured by impedance spectroscopy (IS) and DC conductivity for a group of high surface area nanostructured 5 – 30% w/w NiO/Al2O3 composite materials are reported. The nanocomposites were prepared via a sol – gel method, which involved mixing of the respective sol – gel precursors and the subsequent drying and calcination at 873 K for 3 h. ... إقراء المزيد