Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, 01062 Dresden, Germany.
Langmuir. 2010 Jan 5;26(1):552-9. doi: 10.1021/la902026e.
Dielectrophoresis-assisted growth of metallic nanowires from an aqueous salt solution has been previously reported, but so far there has been no clear understanding of the process leading to such a bottom-up assembly. The present work, based on a series of experiments to grow metallic nano- and microwires by dielectrophoresis, provides a general theoretical description of the growth of such wires from an aqueous salt solution. Palladium nanowires and silver microwires have been grown between gold electrodes from their aqueous salt solution via dielectrophoresis. Silver microwire growth has been observed in situ using light microscopy. From these experiments, a basic model of dielectrophoresis-driven wire growth is developed. This model explains the dependence of the growth on the frequency and the local field enhancement at the electrode asperities. Such a process proves instrumental in the growth of metallic nanowires with controlled morphology and site specificity between the electrodes.
先前已有报道，通过电介质电泳辅助从水溶液盐溶液中生长金属纳米线，但迄今为止，对于导致这种自下而上组装的过程仍没有清晰的认识。本工作基于一系列通过电介质电泳生长金属纳米线和微米线的实验，为从水溶液盐溶液中生长此类线材提供了一般性的理论描述。钯纳米线和银微米线已通过电介质电泳从其水溶液盐溶液在金电极之间生长。使用光学显微镜原位观察到银微米线的生长。根据这些实验，开发了一个电介质电泳驱动线材生长的基本模型。该模型解释了生长对电极粗糙度处的频率和局部场增强的依赖性。这种方法对于在电极之间生长具有受控形态和位置特异性的金属纳米线非常有效。
