Scanning electron microscopy 17 Field emission scanning electron microscopes 15 History of engineering and technology 5 Technology: general issues 5 Fourier transform infrared spectroscopy 4 Morphology 4 Scanning electron microscope 4 Carbon dioxide 3 Energy gap 3 Oxide minerals 3 Semiconductor materials 3 X ray diffraction 3 Zinc oxide 3 scanning electron microscope 3 scanning electron microscopy 3 Chemical compositions 2 Combustion method 2 Copper 2 Cost effectiveness 2 Crystallite size 2 Ethylene 2 Growth inhibition 2 Microorganisms 2 Morphological study 2 Nano-structured 2 Nanostructured materials 2 Nanostructures 2 Oils and fats 2 Optical properties 2 Photocatalytic activity 2