Agrawal Ved Varun, Kulkarni G U, Rao C N R
Chemistry and Physics of Material Unit and DST Unit on Nanoscience, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 5600064, India.
J Colloid Interface Sci. 2008 Feb 15;318(2):501-6. doi: 10.1016/j.jcis.2007.10.013. Epub 2007 Oct 16.
The effect of surfactants such as tetraoctylammoniumbromide (TOAB) and cetyltrimethylammoniumbromide (CTAB) on the type of nanostructures formed when gold ions present in the organic phase are reduced at the interface by hydrazine in the aqueous phase has been investigated. Extended fractal structures are formed at the liquid-liquid interface, the fractal structures themselves comprising cauliflower type units formed by gold nanorods. Accordingly, the nanostructures exhibit transverse and longitudinal plasmon adsorption bands in the 550 and 800 nm regions, respectively. Dendritic structures of silver are formed at the interface when Ag ions are reduced similarly in the presence of surfactants. The nanostructures consist of nanoparticles or nanorods with five-fold symmetry.
研究了诸如四辛基溴化铵（TOAB）和十六烷基三甲基溴化铵（CTAB）等表面活性剂对有机相中存在的金离子在水相中被肼在界面处还原时形成的纳米结构类型的影响。在液-液界面形成了扩展的分形结构，分形结构本身由金纳米棒形成的菜花状单元组成。因此，这些纳米结构分别在550和800nm区域表现出横向和纵向等离子体吸附带。当在表面活性剂存在下类似地还原Ag离子时，在界面处形成银的树枝状结构。这些纳米结构由具有五重对称性的纳米颗粒或纳米棒组成。
