Formation and Stability of Gold Nanoflowers by the Seeding Approach: The Effect of Intraparticle Ripening
Formation and Stability of Gold Nanoflowers by the Seeding Approach: The Effect of Intraparticle Ripening
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播种法金纳米花的形成和稳定性：颗粒内成熟的影响
DOI：
10.1021/jp9058406
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发表时间：
2009-09-24
影响因子：
3.7
通讯作者：
Peng, Xiaogang
中科院分区：
文献类型：
--
作者：
Zhao, Lili;Ji, Xiaohui;Peng, Xiaogang
系统研究了以25纳米金纳米粒子为种子，以氯金酸和羟胺的混合物为生长溶液制备金纳米花的种子法。研究表明，反应体系中存在的氯离子引起的粒子内熟化对纳米花的形成和稳定性有很大影响。在这种种子法中，羟胺促进了氯金酸的快速还原，从而在生长溶液中快速形成直径约为3纳米的小金粒子。这些小粒子在种子表面的附着促进了纳米花的生长。由于在较高pH值下熟化受到抑制，纳米花的分支长度随着生长溶液pH值的升高而增加。通过提高储存溶液的pH值和/或去除氯离子，可以提高纳米花的稳定性。
The seeding approach for preparation of gold nanoflowers in which 25 nm gold nanoparticles were used as the seeds and a mixture of HAuCl4 and hydroxylamine as growth solution was investigated systematically. It is revealed that the formation and stability of the nanoflowers were affected greatly by the intraparticle ripening induced by the chlorine ions that existed in the reaction system. In this seeding approach, hydroxylamine promoted the rapid reduction of HAuCl4 and thus rapid formation of small Au particles with a diameter around 3 nm in the growth solution. The attachment of the small particles on the seed surface contributed to the growth of the nanoflowers. The branch length of the nanoflowers increased with the increased pH of the growth solution due to the suppressed ripening at higher pH. The stability of the nanoflowers can be improved by increasing the pH of the storing solution and/or removal of the chlorine ions.