{'fraction_non_alphanumeric': 0.02165605095541401, 'fraction_numerical': 0.005095541401273885, 'mean_word_length': 6.1454545454545455, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Preparation of ZnO Nanostructures by Chemical Precipitation Method

ZnO nanostructures have been successfully prepared by dissolution–reprecipitation of micro-sized ZnO powder from aqueous ammonium hydrogencarbonate solution in the presence of thiourea, followed by calcination at 400°C for 1 h. The products were characterized by simultaneous thermal analysis, x-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction, and Fourier-transform infrared spectroscopy analysis. The results reveal that the morphology and particle size of the as-prepared ZnO samples are susceptible to the amount of added thiourea. The developed method has potential for application in industry due to simple processing and inexpensive reagents.