Characterization of bimetallic core-shell nanorings synthesized via ascorbic acid-controlled galvanic displacement followed by epitaxial growth
Characterization of bimetallic core-shell nanorings synthesized via ascorbic acid-controlled galvanic displacement followed by epitaxial growth
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DOI：
10.1039/c3tc32340d
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发表时间：
2014-01-01
影响因子：
6.4
通讯作者：
Senapati, Dulal
中科院分区：
文献类型：
--
作者：
Ghosh, Tanmay;Satpati, Biswarup;Senapati, Dulal
本文介绍了抗坏血酸在室温下合成纳米核壳环中的作用。以二维三角形银纳米粒子为模板，首先通过电化学置换反应合成二维三角形金（Au）纳米环，然后通过外延生长工艺在Au纳米环上生长Ag。透射电子显微镜（TEM）和相关技术用于深入表征。TEM研究表明，单晶银纳米粒子导致形成连续的Au纳米环与单晶壁，和空隙空间，证实与模板的形状只有当抗坏血酸被添加到生长溶液。银纳米片和金纳米环都具有（111）面作为基面。随后，我们使用先前合成的Au纳米环作为模板合成了Au核Ag壳纳米环。能量色散X射线（EDX）线轮廓光谱和成像，沿着与高角度环形暗场扫描/透射电子显微镜（STEM-HAADF），被广泛用于组成的研究，除了能量过滤TEM（EFTEM）成像。
This paper describes the role of ascorbic acid in synthesizing bimetallic core-shell nanorings at room temperature. Using two-dimensional (2D) triangular silver nanoparticles as templates, we first synthesized 2D triangular gold (Au) nanorings via the galvanic replacement reaction and then overgrown Ag on Au nanorings via an epitaxial growth process. Transmission Electron Microscopy (TEM) and associated techniques were used for in-depth characterization. The TEM study revealed that single crystalline Ag nanoparticles led to the formation of continuous Au nanorings with single crystalline walls, and the void spaces which corroborate with the template shapes only when ascorbic acid was added to the growth solution. Both the silver nanoplates and gold nanorings have (111) planes as the basal planes. Subsequently we synthesized Au-core-Ag-shell nanorings using the previously synthesized Au nanorings as templates. Energy dispersive X-ray (EDX) line profile spectra and imaging, along with high-angle annular dark field scanning/transmission electron microscopy (STEM-HAADF), were used extensively for compositional studies in addition to energy filtered TEM (EFTEM) imaging.