Field emission scanning electron microscopes Scanning electron microscopy 13 Energy gap 3 Fourier transform infrared spectroscopy 3 Morphology 3 Oxide minerals 3 X ray diffraction 3 Zinc oxide 3 Carbon dioxide 2 Chemical compositions 2 Combustion method 2 Copper 2 Crystallite size 2 Ethylene 2 Microorganisms 2 Morphological study 2 Nano-structured 2 Oils and fats 2 Optical properties 2 Photocatalytic activity 2 Semiconductor materials 2 Silicones 2 Titanium dioxide 2 Transmission electron microscopy 2 Waste cooking oil 2 Zinc 2 Absorption co-efficient 1 Absorption edges 1 Absorption mechanisms 1 Adhesion 1