Co-effect of soft template and microwave irradiation on morphological control of gold nanobranches
Co-effect of soft template and microwave irradiation on morphological control of gold nanobranches
复制标题
软模板和微波辐射对金纳米枝形貌控制的协同作用
DOI：
10.1007/s00396-011-2493-x
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发表时间：
2011-10-01
影响因子：
2.4
通讯作者：
Jiang, Ming
中科院分区：
文献类型：
--
作者：
Fang, Yun;Ren, Yueping;Jiang, Ming
短程有序的十二烷基硫酸钠(SDS)胶束和长程有序的聚乙烯吡咯烷酮(PVP)-十二烷基硫酸钠(SDS超分子)在PVP-SDS水溶液中的超分子组装显示了模板在指导无机纳米结构分级组装方面的潜在应用。本文采用一锅法、简便、快速、形貌可控的合成方法，在PVP-十二烷基硫酸钠水溶液中，采用一锅法合成了当量圆直径约为50 nm的姜黄色金纳米棒。根据实验结果，推测生姜状金纳米棒的生长机理可能是通过PVP-十二烷基硫酸钠软模板与微波辐射的独特协同作用，实现了模板介导型和微波辅助的分级组装。首先，在微波辐射的辅助下，柠檬酸钠将与十二烷基硫酸钠结合的胶束周围的前体AuCl4(-)迅速还原为Au(0)，并根据结合的胶束模板同时组装成直径在10 nm左右的丰富的Au纳米晶。然后在有限的空间内，通过PVP链连接的几个微小的Au纳米晶被长程有序的PVP-SDS超分子组装瞬间介导，制备成多晶姜状Au纳米棒。X射线衍射图表明，金纳米棒为面心立方相，高分辨电子显微镜(HRTEM)和选区电子衍射(SAED)证实了这一点。
Short-range order sodium dodecyl sulfate (SDS)-bound micelles and long-range order poly(vinylpyrrolidone) (PVP)-SDS supramolecular assemblies in PVP-SDS aqueous solution illustrate the potential template application in directing hierarchical assembly of inorganic nanostructure. In this paper, ginger-like Au nanobranches with equivalent circle diameter around 50 nm were prepared in PVP-SDS aqueous solution under microwave irradiation through a one-pot, facile, rapid, and morphology-controlled synthesis route. Based on the experimental results, the possible growth mechanism of the ginger-like gold nanobranches is inferred to be a template-mediated and microwave-assisted hierarchical assembly via the unique co-effect of PVP-SDS soft template and microwave irradiation. At first, the precursors AuCl (4) (-) surrounding the SDS-bound micelles were rapidly reduced to Au(0) by sodium citrate assisted by microwave irradiation and simultaneously assembled into abundant Au nanocrystals with diameters around 10 nm according to the bound micelle templates. And then several tiny Au nanocrystals linked by PVP chains within a limited space were instantly mediated by the long-range order PVP-SDS supramolecular assemblies to fabricate into polycrystal ginger-like Au nanobranches. X-ray diffraction (XRD) pattern indicates that the Au nanobranches are face-centered cubic phase, which is verified by high-resolution transmission electron microscopy (HRTEM) images and selected area electron diffraction (SAED) pattern.