Ring stain effect at room temperature in silver nanoparticles yields high electrical conductivity
Ring stain effect at room temperature in silver nanoparticles yields high electrical conductivity
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DOI：
10.1021/la0509044
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发表时间：
2005-11-08
期刊：
影响因子：
3.9
通讯作者：
Millo, O
中科院分区：
文献类型：
--
作者：
Magdassi, S;Grouchko, M;Millo, O
我们证明了在室温下通过蒸发含有银纳米颗粒（直径20-30 nm）的水滴自发形成的金属环表现出高电导率（高达散装银的15%）。这种自组装现象背后的机制是“环染色效应”，其中自钉扎与毛细流动相结合以形成由沿着干燥液滴的周边沿着紧密堆积的金属纳米颗粒组成的环。我们的宏观和微观（应用导电原子力显微镜）运输测量表明，环的导电性，它具有金属亮度，是数量级大于相应的聚集体开发没有环的形成，其中高导电性是已知的，只有在高温退火后才出现。
We demonstrate that metallic rings formed spontaneously at room temperature via evaporation of aqueous drops containing silver nanoparticles (20-30 nm in diameter) exhibit high electrical conductivity (up to 15% of that for bulk silver). The mechanism underlying this self-assembly phenomena is the "ring stain effect", where self-pinning is combined with capillary flow to form a ring consisting of close-packed metallic nanoparticles along the perimeter of a drying droplet. Our macroscopic and microscopic (applying conductive atomic force microscopy) transport measurements show that the conductivity of the ring, which has a metallic brightness, is orders of magnitude larger than that of corresponding aggregates developed without the ring formation, where high conductivity is known to appear only after annealing at high temperature.