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首页> 外文期刊>Nanotechnology >The superiority of silver nanoellipsoids synthesized via a new approach in suppressing the coffee-ring effect during drying and film formation processes
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The superiority of silver nanoellipsoids synthesized via a new approach in suppressing the coffee-ring effect during drying and film formation processes

机译：通过新方法合成的纳米银椭圆体在抑制干燥和成膜过程中的咖啡环效应方面的优越性

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摘要

Silver nanoellipsoids (Ag NEs) with about 40 nm diameter minor axis and 100 nm major axis were prepared by a typical polyol process in the presence of poly(vinyl pyrrolidone), using Cl~- as etching agent at the early stage of synthesis and poly(ethylene glycol) at the later stage to control the size. A suspension of these kinds of Ag NEs can resist the coffee-ring effect and deposit uniform films after drying. By contrast, suspensions of spherical silver nanoparticles suffer the coffee-ring effect badly, always leaving a ring on the edge of patterns after evaporation is complete. The reasons behind these phenomena can be mainly attributed to the long-ranged interparticle attraction between Ag NEs that preserves them from being transported by Marangoni flows during the drying process. These Ag NEs will be very useful in the preparation of conductive inks. They can perform well in the solidification process of printed patterns, forming uniform and smooth films, greatly enhancing the printing efficiency.
机译：通过典型的多元醇工艺，在聚乙烯吡咯烷酮的存在下，使用Cl-作为蚀刻剂，在合成的早期阶段，通过典型的多元醇工艺制备了直径约40 nm的短轴和100 nm长轴的纳米银椭圆体（Ag NEs）。 （乙二醇）在后期控制尺寸。这些类型的Ag NEs的悬浮液可以抵抗咖啡环效应，并在干燥后沉积均匀的薄膜。相比之下，球形银纳米颗粒的悬浮液会严重遭受咖啡环的影响，在蒸发完成后，始终在图案的边缘留下一个环。这些现象背后的原因可能主要归因于Ag NEs之间的长距离颗粒间吸引力，这使它们在干燥过程中不会被Marangoni流运输。这些Ag NEs在制备导电油墨方面将非常有用。它们在印刷图案的固化过程中表现良好，形成均匀，光滑的薄膜，大大提高了印刷效率。

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