Sharma Subash, Paudel Jaisi Balaram, Araby Mona Ibrahim, Elnobi Sahar, Ayhan Muhammed Emre, Kalita Golap, Tanemura Masaki
Department of Physical Science and Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555 Japan
Faculty of Engineering and Architecture, Department of Metallurgical and Materials Engineering, Necmettin Erbakan University Konya Turkey.
RSC Adv. 2019 Oct 24;9(59):34377-34381. doi: 10.1039/c9ra05936a. eCollection 2019 Oct 23.
For the fabrication of graphene-based nano-scale interconnects, precise control over their position and proper nanoscale soldering are essential. In this work, we report the Joule heat-induced conversion of amorphous carbon to graphene in an TEM setup, using Mo as a catalyst. The catalytic role of Mo during graphene formation has been less explored compared to other metals like Cu or Ni. Compared to metals like Cu, Mo is less subject to electromigration and brittleness, making it suitable for high-temperature electronics. We found that during the electromigration of Mo, amorphous carbon nanofibers (CNFs) can be converted to highly crystalline few-layered graphene. It was also found that during the graphene formation process, agglomerated Mo particles can be effectively channeled to the end of graphene by voltage-driven electromigration. An agglomerated Mo particle between the probe and graphene acted as a soldering agent, providing the prospect of the further exploration of Mo as a nanoscale soldering material. This work explores the double role of Mo: as a catalyst for graphene synthesis and as a soldering material.
对于基于石墨烯的纳米级互连的制造，精确控制其位置和进行适当的纳米级焊接至关重要。在这项工作中，我们报告了在透射电子显微镜（TEM）装置中，以钼（Mo）为催化剂，通过焦耳热诱导非晶碳转化为石墨烯的过程。与铜（Cu）或镍（Ni）等其他金属相比，钼在石墨烯形成过程中的催化作用研究较少。与铜等金属相比，钼不易发生电迁移且不易脆化，这使其适用于高温电子学。我们发现，在钼的电迁移过程中，非晶碳纳米纤维（CNF）可以转化为高度结晶的少层石墨烯。还发现，在石墨烯形成过程中，通过电压驱动的电迁移，团聚的钼颗粒可以有效地被引导到石墨烯的末端。探针与石墨烯之间的团聚钼颗粒充当了焊接剂，为进一步探索钼作为纳米级焊接材料提供了前景。这项工作探索了钼的双重作用：作为石墨烯合成的催化剂和作为焊接材料。
