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通过水溶液还原法用抗坏血酸还原Cu2+制备纳米铜颗粒,并研究溶液pH和Cu2O平均粒径对纳米铜颗粒制备的影响。在溶液pH值为3、5和7时,可制得铜颗粒,并且在pH=7时制得的铜颗粒粒径最小。在溶液pH为9和11时无法制得铜颗粒。Cu2O的平均粒径能影响铜粉的粒径。Cu2O的平均粒径越大,得到的铜颗粒越大。通过对反应过程中不同时间点收集的样品进行XRD分析,可探索出反应的进程。在反应过程中,Cu(OH)2首先作为前驱体出现,然后被还原为Cu2O,最后被还原为铜颗粒。
Cu2 nanoparticles were prepared by reduction of Cu2 + with ascorbic acid by aqueous solution reduction method. The effects of solution pH and average particle size of Cu2O on the preparation of nano-copper particles were investigated. Copper particles are produced at solution pH values 3, 5 and 7, and the copper particles produced at pH = 7 have the smallest particle size. Copper particles can not be prepared at pH 9 and pH 11. The average particle size of Cu2O can affect the particle size of copper powder. The larger the average particle size of Cu2O, the larger the resulting copper particles. By analyzing the samples collected at different time points during the reaction, the progress of the reaction can be explored. During the reaction, Cu (OH) 2 first appeared as a precursor and was then reduced to Cu2O and finally reduced to copper particles.