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Room-Temperature Chemical Welding and Sintering of Metallic Nanostructures by Capillary Condensation

机译：金属纳米结构的毛细管冷凝室温化学焊接和烧结

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摘要

Room-temperature welding and sintering of metal nanostructures, nanoparticles and nanowires, by capillary condensation of chemical vapors have successfully been demonstrated. Nanoscale gaps or capillaries that are abundant in layers of metal nanostructures have been found to be the preferred sites for the condensation of chemically oxidizing vapor, H2O2 in this work. The partial dissolution and resolidification at such nanogaps completes the welding/sintering of metal nanostructures within similar to 10 min at room-temperature, while other parts of nanostructures remain almost intact due to negligible amount of condensation on there. The welded networks of Ag nanowires have shown much improved performances, such as high electrical conductivity, mechanical flexibility, optical transparency, and chemical stability. Chemically sintered layers of metal nanoparticles, such as Ag, Cu, Fe, Ni, and Co, have also shown orders of magnitude increase in electrical conductivity and improved environmental stability, compared to nontreated ones. Pertinent mechanisms involved in the chemical welding/sintering process have been discussed. Room-temperature welding and sintering of metal nanostructures demonstrated here may find widespread application in diverse fields, such as displays, deformable electronics, wearable heaters, and so forth.
机译：已经成功地证明了通过化学蒸气的毛细管冷凝在室温下进行的金属纳米结构，纳米颗粒和纳米线的焊接和烧结。已经发现，在这项工作中，金属纳米结构层中大量存在的纳米级间隙或毛细管是化学氧化蒸气H2O2冷凝的首选位置。在这样的纳米间隙处的部分溶解和再固化在室温下约10分钟内完成了金属纳米结构的焊接/烧结，而纳米结构的其他部分由于在其上可忽略的冷凝量而几乎保持完好无损。 Ag纳米线的焊接网络已显示出大大改善的性能，例如高电导率，机械柔韧性，光学透明性和化学稳定性。与未经处理的金属纳米粒子（例如，Ag，Cu，Fe，Ni和Co）的化学烧结层相比，其导电性也得到了数量级的提高，并改善了环境稳定性。已经讨论了化学焊接/烧结过程中涉及的相关机制。本文演示的金属纳米结构的室温焊接和烧结可能会在各种领域中得到广泛应用，例如显示器，可变形电子产品，可穿戴加热器等。

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