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首页> 外文期刊>Applied Surface Science >Femtosecond and nanosecond laser sintering of silver nanoparticles on a flexible substrate
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Femtosecond and nanosecond laser sintering of silver nanoparticles on a flexible substrate

机译：飞秒和纳秒激光烧结在柔性基板上的银纳米颗粒

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摘要

Pulsed-laser sintering of metal nanoparticles on flexible substrates has attracted increasing attention owing to its potential in direct printing of high-resolution patterns or fabricating flexible devices on thermally weak substrates. However, the physics of pulsed-laser sintering, including the microstructures, properties, and their correlations in different processing regimes, is not yet clearly understood. Especially, the characteristics of ultrafast laser sintering using femtosecond laser pulses without the heat accumulation effect and their comparison with those of nanosecond laser sintering are still unclear. This work analyzed the silver nanoparticle sintering process on polyethylene terephthalate substrates using a KrF nanosecond excimer laser and a Ti: sapphire femtosecond laser. The two laser sources with substantially different pulse widths were compared in terms of the sintering mechanisms, electrical conductivity, flexibility, and adhesion strength of the sintered silver films. Under optimal conditions, femtosecond laser sintering yielded better electrical conductivity and flexibility than nanosecond laser sintering. The nanosecond laser sintering occurred by solid-state diffusion (surface necking) or by full melting of the particles depending on the process condition. On the other hand, the femtosecond laser sintering took place only by inter-particle necking because the polymer substrate was damaged before melting of the particle began.
机译：柔性基板上的金属纳米粒子的脉冲激光烧结由于其在直接印刷高分辨率图案或在热弱基板上制造柔性器件的潜力而备受关注。然而，脉冲激光烧结的物理学，包括微观结构，性能及其在不同加工方式下的相互关系，目前尚不清楚。特别是，使用飞秒激光脉冲的超快激光烧结没有蓄热作用的特性以及与纳秒激光烧结的比较尚不清楚。这项工作分析了使用KrF纳秒准分子激光器和Ti：蓝宝石飞秒激光器在聚对苯二甲酸乙二醇酯基底上的银纳米颗粒烧结工艺。比较了两种脉冲宽度基本不同的激光源的烧结机理，电导率，柔韧性和烧结银膜的粘附强度。在最佳条件下，飞秒激光烧结比纳秒激光烧结产生更好的导电性和柔韧性。纳秒激光烧结是通过固态扩散（表面颈缩）或颗粒的完全熔化而产生的，具体取决于工艺条件。另一方面，飞秒激光烧结仅通过颗粒间颈缩进行，因为聚合物基质在颗粒开始熔化之前就被破坏了。

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