structural properties Contact angle 2 Mn-doped NiO nanosheets 2 annealing temperature 2 electrical properties humidity sensor 2 electrospinning 2 nanofibers 2 optical properties 2 pineapple leaf fiber 2 wetting properties 2 Annealing 1 Annealing temperatures 1 BEHAVIOR 1 Coated glass substrates 1 Crystallite size 1 Dislocation densities 1 Electrical characteristic 1 Energy dispersive X ray spectroscopy 1 Energy dispersive spectroscopy 1 Energy gap 1 FABRICATION 1 Field emission microscopes 1 Field emission scanning electron microscopy 1 Humidity measurements 1 Humidity sensors 1 Increasing temperatures 1 MECHANICAL-PROPERTIES 1 Manganese metallography 1 Nanosheets 1 Nickel metallography 1