直接置换法制备包覆型纳米铜-银双金属粉末
Study on synthesis of Ag coating Cu bimetallic nano-powders by direct substitution reaction
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摘要: 以AgNO3为主盐，采用直接置换法初步制备了包覆型纳米铜-银双金属粉末，分析了工艺条件对包覆效果的影响，并用透射电子显微镜、X射线能量色散谱仪和X射线衍射仪进行了表征。实验结果表明：纳米铜-银双金属粉末为包覆型结构，平均粒径约70 nm，分散性较好，表面银的原子分数达到74.28%。在洗涤过程中加入一定量的保护剂，有效解决了纳米铜粉的氧化问题。Abstract: The Ag coating Cu bimetallic nano-powders were synthesized by substitution reaction with AgNO3.The synthesis process was discussed and the bimetallic powders were characterized by TEM, EDXS and XRD. The experimental results indicate that the bimetallic powders have a Ag coating Cu nano-powder structure and disperse well, the average grain size is 70 nm and the Ag molar content on the surfaces of the bimetallic powders reaches 74.28%. The oxidation of Cu nano-powders in the lavation process was avoided effective by adding of protective reagent.
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Key words:
- cu-ag bimetallic powder /
- nano-metal /
- coating /
- substitution reaction
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