Layer-by-layer polymeric supramolecular structures containing nickel hydroxide nanoparticles and microcrystallites

被引:30
作者
Fojas, AM [1 ]
Murphy, E [1 ]
Stroeve, P [1 ]
机构
[1] Univ Calif Davis, Dept Mat Sci & Chem Engn, CPIMA, Davis, CA 95616 USA
关键词
D O I
10.1021/ie010689w
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Supramolecular polymer structures were assembled using the layer-by-layer, polyionic deposition technique. Depositing alternating layers of a polycation, poly(diallyldimethylammonium chloride), and a polyanion, poly(styrenesulfonate), formed the thin films. The nucleation of nickel hydroxide nanoparticles was achieved using a cyclical absorption-oxidation process in which nickel ions were absorbed into the polymer matrix (which bind to the sulfonate groups) and then oxidized in an alkali solution. Ultraviolet-visible spectroscopy was used to monitor the deposition of the thin film, as well as the subsequent nucleation and growth of nanoparticles within the supramolecular structure. Characterization of the nanoparticles using Fourier transform infrared spectroscopy showed the presence of the alpha form of nickel hydroxide, and X-ray diffraction analysis showed a mixture of both alpha and beta forms of nickel hydroxide. Transmission electron microscopy images revealed fibrous, needlelike microcrystalline structures, increasing in size with absorption-oxidation cycles, surrounded by nanoparticles of approximately 5-50 nm in size.
引用
收藏
页码:2662 / 2667
页数:6
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