Humidity sensors Substrates 4 Zinc oxide 4 Coated glass substrates 3 Field emission microscopes 3 Field emission scanning electron microscopy 3 Humidity sensing 3 Humidity sensor 3 II-VI semiconductors 3 Scanning electron microscopy 3 Electrical characteristic 2 Electrodes 2 Energy dispersive X ray spectroscopy 2 Immersion method 2 Nanorods 2 Nanosheets 2 Nickel oxide 2 Oxide films 2 Oxide minerals 2 Sensor applications 2 Single mode fibers 2 Thin films 2 X ray photoelectron spectroscopy 2 humidity sensor 2 Adsorbed water 1 Aerosol-assisted chemical vapour depositions 1 Alumina 1 Alumina substrates 1 Aluminum oxide 1 Ambient humidity 1