Photoreductive synthesis of monodispersed Au nanoparticles with citric acid as reductant and surface stabilizing reagent
Photoreductive synthesis of monodispersed Au nanoparticles with citric acid as reductant and surface stabilizing reagent
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DOI：
10.1039/c6ra27771c
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Hirai, Takayuki
中科院分区：
文献类型：
--
作者：
Shiraishi, Yasuhiro;Tanaka, Haruki;Hirai, Takayuki
以柠檬酸为还原剂和表面稳定剂，加热含HAuCl 4的水，可制备金纳米粒子（AuNPs）的胶体悬浮液。然而，这种热还原方法促进了所形成的AuNP的聚集，导致AuNP的双峰分布。在这里，我们报告说，紫外线（254 nm）照射的水含有HAuCl 4柠檬酸在室温下成功地减少HAuCl 4，并产生单分散的金纳米粒子，同时抑制所形成的金纳米粒子的聚集。改变紫外光的强度或柠檬酸的添加量成功地产生了具有可调尺寸和窄尺寸分布的AuNPs。
Colloidal suspensions of gold nanoparticles (AuNPs) in water can be prepared by heating water containing HAuCl4 with citric acid as reductant and surface stabilizing reagent. This thermal reduction method, however, promotes aggregation of the formed AuNPs, resulting in bimodal distribution of AuNPs. Here we report that UV (254 nm) irradiation of water containing HAuCl4 with citric acid at room temperature successfully reduces HAuCl4 and produces monodispersed AuNPs, while suppressing aggregation of the formed AuNPs. Changing the intensity of UV light or the amount of citric acid added successfully produces AuNPs with tunable sizes and narrow size distributions.