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[求助]
关于纳米银颗粒的制备 已有4人参与
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大家上午好~ 最近想合成一些纳米银颗粒， 用了硝酸银和柠檬酸钠 微沸 （大约160℃） 制备出的银大概有100nm左右。 想请教一下怎么合成出颗粒更小的纳米银呢， 最好在几纳米或十几纳米 。 而且在我合成过程中会有一些银镜反应发生，想问怎么避免发生银镜反应。 |
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nanofellow
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Y. Wan, Z. Guo, X. Jiang, K. Fang, X. Lu, Y. Zhang, N. Gu, Quasi-spherical silver nanoparticles: aqueous synthesis and size control by the seed-mediated Lee-Meisel method, Journal of Colloid and Interface Science 394 (2013) 263-8. 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. |
12楼2021-07-03 13:44:11
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2楼2018-03-30 09:14:37
3楼2018-03-30 15:00:32
qiuchenxi123
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4楼2018-03-30 15:46:23