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东陆浪子

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[求助] 硝酸银和柠檬酸钠合成纳米银已有2人参与

用柠檬酸钠和硝酸银合成球形纳米银，结果出现很多棒状的纳米银。这是什么原因？是不是搅拌时间不够。我一般合成纳米银都是搅拌和加热同时进行。当合成溶液变色时，停止搅拌和加热，冷凝1小时。

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fbqrdzs: 金币+5, 应助指数+1 2017-01-26 11:13:01

可以看看我们小组的工作，你的问题在文章中有明确解释：
Wan Y, Guo Z, Jiang X, Fang K, Lu X, Zhang Y, Gu N: Quasi-spherical silver nanoparticles: Aqueous synthesis and size control by the seed-mediated Lee-Meisel method. J Colloid Interface Sci 2013, 394:263-268.
Abstract：Silver nanoparticles (AgNPs) are attracting tremendous attention in biomedicine, and their related performances are shape and size-dependent. For biomedical applications, water-soluble AgNPs are necessary.
However, aqueous syntheses of AgNPs with controlled shape and size are relatively difficult as the balance between nucleation and growth is hard to regulate. This paper describes a robust method for controllable synthesis of quasi-spherical AgNPs based on the combination of the seed-mediated growth and
the Lee–Meisel method by thermal reduction of AgNO3with citrate. In the presented method, citrate-stabilized AgNPs with tunable sizes up to 80 nm were achieved through one-step or stepwise growth process using qualified spherical 4 nm AgNPs as starter seeds. Specially, the two main difficulties (formation
of nanorods and secondary nucleation during the growth stage) in the previous studies have been effectively overcome by tailoring the experimental parameters such as the reaction temperature and the seed amount, without extra additives, pH adjustment, and laser treatment. The crucial factors that affect the uniformity of the resulting AgNPs are discussed.