Direct synthesis of size-tailored bimetallic Ag/Au nano-spheres and nano-chains with controllable compositions by laser ablation of silver plate in HAuCl4 solution
Direct synthesis of size-tailored bimetallic Ag/Au nano-spheres and nano-chains with controllable compositions by laser ablation of silver plate in HAuCl4 solution
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DOI：
10.1039/c5ra24578h
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发表时间：
2016-01
期刊：
影响因子：
3.9
通讯作者：
Ming Chen;Dameng Wang;Xiangdong Liu
中科院分区：
文献类型：
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作者：
Ming Chen;Dameng Wang;Xiangdong Liu
采用激光烧蚀法将块状银金属直接转化为组分可控的尺寸可调的银-金（Ag/Au）纳米球和纳米链。利用Ag和Au离子之间的置换反应，随着HAuCl 4浓度的增加（0.12-4.59 mM），Ag/Au纳米粒子的平均尺寸从几十nm显著减小到小于2 nm。同时，单个Ag/Au纳米颗粒中Ag和Au元素的相对比例已经从约9：1系统地改变到1：9。Ag/Au纳米粒子的紫外-可见吸收光谱从400 nm显著红移到785 nm。设计简单，一步，通用的策略不需要种子制备，中间处理过程或任何潜在的有毒表面活性剂。这将为制备具有所需结构和功能的纳米颗粒提供一种方便而有价值的新方法。
The direct conversion of bulk silver metal to size-tailored bimetallic silver–gold (Ag/Au) nano-spheres and nano-chains with controllable compositions has been achieved by laser ablation of an Ag target in HAuCl4 solution. Taking advantage of the replacement reaction between Ag and Au ions, the average sizes of the bimetallic Ag/Au nano-particles substantially decreased from tens of nanometers to sub-2 nm with the increase in HAuCl4 concentration (0.12–4.59 mM). Meanwhile, the relative ratio of Ag and Au elements in individual Ag/Au nano-particles has been systematically changed from about 9 : 1 to 1 : 9. The UV-visible absorption spectra of the Ag/Au nano-particles significantly red shifted from about 400 nm to 785 nm. The designed simplistic, single-step, versatile strategy does not require seed preparations, intermediate workup processes or any potential toxic surfactants. This will offer a convenient and valuable new way to fabricate bimetallic nano-particles with desired structures and functions.