Preparation of controllable core-shell gold nanoparticles and its application in detection of silver ions.
Preparation of controllable core-shell gold nanoparticles and its application in detection of silver ions.
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DOI：
10.1021/am101034h
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发表时间：
2011-01
影响因子：
9.5
通讯作者：
Haowen Huang;Caiting Qu;Xuanyong Liu;Shaowen Huang;Zhongjian Xu;Bo Liao;Y. Zeng;P. Chu
中科院分区：
文献类型：
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作者：
Haowen Huang;Caiting Qu;Xuanyong Liu;Shaowen Huang;Zhongjian Xu;Bo Liao;Y. Zeng;P. Chu
我们报告了一种新颖的壳技术来制备可控的核壳纳米颗粒。在该技术中，当核与金属离子和Na(2)S(2)O(3)反应时形成壳，并且可以控制核的尺寸和壳的厚度。透射电子显微镜和X射线衍射表明，壳由不溶性复合盐组成，包括Au(2)S、AuAgS和Ag(3)AuS(2)。在不同反应阶段获得的核-壳纳米颗粒表明Au(2)S、AuAgS和Ag(3)AuS(2)壳的形成是从外部进行的。颗粒的形态演变随着反应时间发生显着变化，表明壳的形成是由固体壳中的扩散引起的。该技术制备的核壳纳米粒子可用作纳米传感器，以高选择性和灵敏度检测水介质中的Ag(+)。通过与其他金属离子的响应比较，证明了对 Ag(+) 的优异选择性。此外，我们的评估表明金纳米棒比金纳米球具有更高的灵敏度。
We report a novel shell technique to prepare controllable core-shell nanoparticles. In this technique, the shell is formed when the core reacts with metal ions and Na(2)S(2)O(3) and the size of the core and thickness of the shell can be controlled. Transmission electron microscopy and X-ray diffraction reveal that the shell consists of insoluble complex salts comprising Au(2)S, AuAgS, and Ag(3)AuS(2). The resulting core-shell nanoparticles obtained at different reaction stages demonstrate that the formation of Au(2)S, AuAgS, and Ag(3)AuS(2) shell proceeds from the outside. The morphological evolution of the particles changes significantly with reaction time demonstrating that formation of the shell results from diffusion in the solid shell. The core-shell nanoparticles produced by this technique can be used as nanosensors to detect Ag(+) in aqueous media with high selectivity and sensitivity. The excellent selectivity for Ag(+) is demonstrated by comparing the response to other metal ions. In addition, our evaluation indicates that gold nanorods offer higher sensitivity than gold nanospheres.