Temperature Dependence of Electrical Conductivity of Carbon Nanotube Films from 300 to 1100 K
Carbon nanotube (CNT) films are the most promising high-temperature electronic materials of the future. Studying the conductivity-temperature characteristic of the CNT films is an effective method to understand their nature of conduction. In this work, we present first measurement of the temperature dependence of electrical conductivity of the direct spun CNT film in a wide temperature range, from 300 up to 1100 K. The results indicate that the conductivity of the film increases with increase of the temperature up to the crossover temperature (T*), above which it starts decreasing. We find that the conduction of the CNT film is determined by two components, the individual nanotube resistance (Rtube) and the contact resistance (Rcontact). At the temperature below T*, Rcontact plays a major role in the charge transport. Above T*, both Rtube and Rcontact determine the conduction behavior, due to the electron–phonon scattering in the individual CNT at high temperatures. We propose that the study of conductivity-temperature characteristic of the CNT films provides lots of information for understanding the conduction mechanisms of the films and thus aids to improve their conductivity and applications at high temperatures.
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