Coral-shaped 3D assemblies of gold nuclei induced by UV irradiation and its disintegration

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• 作者：Shengchun Yang ; Ruili Zhang ; Qingfeng Wang ; Binjun Ding ; Yaping Wang
• 关键词：Coral-shaped nanostructure ; UV irradiation ; Nanonetworks ; Continuous synthesis
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2007
• 出版时间：1 December 2007
• 年：2007
• 卷：311
• 期：1-3
• 页码：174-179
• 全文大小：1064 K

文摘

In this paper, a coral-shaped three-dimensional (3D) assembly of gold nuclei was formed by UV irradiation of HAuCl₄ solution in the presence of citric acid. Such coral-shaped nanostructure was built up of numerous nuclei less than 5 nm in diameter. The results showed that the initially formed nuclei spontaneously experienced a self-assembly process to form this 3D nanostructure. Transmission electron microscopy (TEM) images indicated that this coral-shaped 3D nanostructure was disintegrated during the ripening process. The UV irradiation-assisted ripening process induced the formation of single-crystalline nanonetworks. However, when the ripening process was performed without UV irradiation, the nanoparticles with various shapes were observed. UV–vis spectra indicated that the unreduced AuCl₄⁻ was responsible for the formation of the coral-shaped 3D nanostructure.