LEIVA Ricardo Ramirez University of Santiago

Soldering Process of Iron Filled Carbon Nanotubes

Co-authors MUNIZAGA Vicente, GARCIA Griselda, BRINGA Eduardo, WEISSMANN Mariana, KIWI Miguel

The processes governing the soldering of two carbon nanotubes (CNT) is studied through the behaviour, at high temperature, of two nearby open-end iron filled CNTs, as molten iron flows from both ends and produce a liquid (and eventually solid) junction. This soldering process is accompanied by partial or total healing of the carbon nanotubes, which after cooling and relaxation form just a single unit which encapsulates the iron. The process is studied for various relative separation, diameters and axial offset of the nanotubes. Our results are in qualitative agreement with the experiments reported by Misra and Daraio, and we found that they constitute a possible tool to repair CNT break-ups in future CNT-based nanoelectronic devices. We anticipate that a large droplet of Fe on top of a CNT might prevent the closure of the CNT contact, but allow CNT multi-junctions. Moreover, CNT-metal contacts in general might be useful for the repair and stabilization of nanowire circuits, as recently demonstrated by Illie et al. and in general, for a variety of different uses in the field of nanoelectronics. According to our classical simulations, the final metallic structure includes relatively few defects, and its conductivity should not be severely affected. It remains to test the mechanical properties of these junctions, but given the extensive repair observed here, they should be able to withstand significant stress.