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200A Preparation of ZnO nanorod assembly structure by seed growth method
This research by the Institute of Chemistry and Molecular Engineering of Qingdao University of Science and Technology, to discuss the preparation of ZnO nanorod assembly structure by seed growth method, published in the important journal
The ZnO nanorod assembly structures with various morphologies were prepared by microwave heating method using Zn-Al hydrotalcite nanoparticles as seeds and zinc acetate as precursor. The SEM and XRD were used for characterization. It is found that when the amount of seed liquid is low, it is easy to prepare the flower cluster structure of ZnO nanorods. The length of ZnO nanorods is between several hundred nanometers and 2 meters, and the diameter is between 100 and 300 nm. When the amount of seed liquid is large, it is easy to obtain a multi-structure of large-grained double-sided epitaxial ZnO nanorods or nanotubes of hydrotalcite-like.
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In this work, the assembly structure of ZnO nanorods was successfully prepared by microwave heating method using small nanoparticles of Zn-Al hydrotalcite as seeds. The morphology of this assembly structure was obviously affected by the amount of seed liquid and microwave heating power. Not affected by the reaction time. It was found that when using a lower seed liquid amount (5 to 10 mL) and a low microwave heating power (300 W), it is advantageous to prepare a flower cluster assembly structure of ZnO nanorods; the length of ZnO nanorods in this structure Between a few hundred nanometers and 2 meters, the diameter is between 100 nm and 300 nm. When a large amount of seed liquid (20 to 50 mL) and high microwave heating power (700 W) are used, it is easy to obtain an assembly structure of two kinds of epitaxial ZnO nanorods or nanotubes of hydrotalcite-like nanosheets with a diameter of about 5 m. The assembled structure of this ZnO nanorod will have broad application prospects in photocatalysis, solar cells and wastewater treatment.
Zn(CH3COO) 2.2H 2O and AlCl3 .6H2O were prepared into a 300 mL mixed salt solution with a total concentration of 10 mmol / L in a molar ratio of zinc to aluminum of 3:1, and heated in a microwave reactor at 700 W microwave. Warm up to 95 °C and add 13. 5 mL of ammonia was maintained at 95 °C for 20 min. After completion of the reaction, the mixture was cooled to room temperature, and a large-grained hydrotalcite-like sheet was removed by filtration through a polycarbonate membrane having a pore size of 200 nm, and the obtained filtrate was used as a seed liquid.
