resumo
Understanding resistive (or Joule) heating in fundamental nanoelectronic blocks, such as carbon nanotubes, remains a major challenge, particularly in regard to their structural and thermal variations during prolonged periods of electrical stress. Here we show real-time imaging of the associated effects of Joule heating in the channel of carbon nanotube interconnects. First, electrical contacts to nanotubes entirely filled with a sublimable material are made inside a transmission electron microscope. On exposure to a high current density, resistive hotspots are identified on (or near) the contact points. These later migrate and expand along the carbon nanotube, as indicated by the localized sublimation of the encapsulated material. Using the hotspot edges as markers, it is possible to estimate the internal temperature profiles of the nanotube. Simple and direct, our method provides remarkable spatial and temporal insights into the dynamics of resistive hotspots and millisecond-paced thermal variations occurring inside nanoscaled tubular interconnects.
palavras-chave
TRANSPORT
categoria
Science & Technology - Other Topics
autores
Costa, PMFJ; Gautam, UK; Bando, Y; Golberg, D
nossos autores
Pedro Miguel Ferreira Joaquim da Costa
InvestigadorGrupos
agradecimentos
P.M.F.J.C. acknowledges support from the Portuguese Foundation for Science and Technology (Ciencia2007 Fellowship), the Alexander von Humboldt Foundation (Experienced Researcher Fellowship) and MANA (Short-Term Visiting Research Fellowship). We are grateful for technical discussions with Bernd Buechner, Mark H. Ruemmeli and Silke Hampel.