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In this paper a wet chemical synthesis of zinc oxide assisted by microwave heating was investigated. Two starting solutions of ZnCl2 and NaOH were mixed under different conditions. Then obtained mixture was heated in microwave reactor. Products of reaction were investigated under scanning electron microscope. Results shown that obtained white powder is crystallized nanostructures build from nano- and microscale hexagonal tiles. This structures have hierarchical constitution, where tiles create organized systems in shape of pyramid. This highly build up active surface area can be used to enhanced sensitivity and reaction time of semiconductor gas detectors.