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Improving the morphological stability of a polycrystalline tungsten nanowire with a carbon shell

机译：改善具有碳壳的多晶钨纳米线的形态稳定性

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摘要

Polycrystalline tungsten nanowire is studied for its potential as an interconnect for nanodevices. At elevated temperatures arising from Joule heating at high current densities, a bare 40 nm nanowire was observed in situ in a transmission electron microscope to undergo grain grooving that eventually led to its breakage. By overcoating a carbonaceous layer onto the nanowire surface, the tungsten-carbon core-shell structure was found to sustain a much higher current density of about 3 x 10(7) A cm(-2) before failure, despite significantly higher peak temperature as a result of Joule heating. Failure occurred as a result of a different form of morphological transformation leading finally to breakage by electromigration. These findings suggest that the metal-carbon core-shell structure provides a solution to circumvent morphological instability and increase the current-carrying capability of metallic polycrystalline nanowires.
机译：研究了多晶钨纳米线作为纳米器件互连的潜力。在高电流密度下因焦耳加热而产生的高温下，在透射电子显微镜中原位观察到一条裸露的40 nm纳米线，其晶粒开槽最终导致其断裂。通过将碳质层覆盖在纳米线表面上，发现钨-碳核-壳结构在失效前可维持更高的电流密度，约为3 x 10（7）A cm（-2），尽管峰值温度明显高于焦耳加热的结果。失败是由于不同形式的形态转换而导致的，最终导致电迁移破坏。这些发现表明，金属-碳核-壳结构为解决形态不稳定性和增加金属多晶纳米线的载流能力提供了解决方案。

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