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The effect of thermal annealing on the electrical transport properties of purified and COOH-functionalized single-walled carbon nanotube (SWCNT) films has been investigated and the correlation between the noise property and temperature coefficient of resistance (TCR) has been derived. Thermal annealing has been found highly efficient to improve both noise and TCR properties of the SWCNT films, which is important to applications of SWCNT bolometers. While the improvement may be attributed mainly to the enhanced intertube coupling in the purified SWCNT films, a combined change in both intratube and intertube charge transport is responsible in the case of COOH-functionalized SWCNT films.
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Lu et al. (2008) studied this question.
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