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Issue 34, 2014
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Electrical percolation characteristics of metallic single-walled carbon nanotube networks by vacancy evolution

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Abstract

In the present study, we demonstrate the effect of vacancy evolution on high-pure metallic single-walled carbon nanotube (m-SWCNT) networks by observing the electrical characteristics of the networks on the field-effect transistor (FET). By catalytic oxidation using Co catalyst, vacancy evolution was gradually realized in high-pure m-SWCNT formed as networks between source-drain electrodes of FET. The evolution of vacancy defects in the m-SWCNT networks gradually proceeded by heating FET several times at 250 °C in air. Atomic force microscopic images showed the presence of the Co catalyst nanoparticles, which were evenly formed in the m-SWCNT networks between the electrodes of FET. Vacancy evolution was confirmed by monitoring the D- and G-bands in the Raman spectra measured from the networks after every step of the catalytic oxidation. With vacancy evolution in the networks, the D-band gradually increased, and the transconductance of m-SWCNT networks drastically decreased. In addition, the metallic behaviour of the m-SWCNT networks was converted into a semiconducting one with an on/off ratio of 2.7.

Graphical abstract: Electrical percolation characteristics of metallic single-walled carbon nanotube networks by vacancy evolution

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Publication details

The article was received on 28 May 2014, accepted on 11 Jul 2014 and first published on 14 Jul 2014


Article type: Paper
DOI: 10.1039/C4CP02337D
Citation: Phys. Chem. Chem. Phys., 2014,16, 18370-18374
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    Electrical percolation characteristics of metallic single-walled carbon nanotube networks by vacancy evolution

    D. Kim, J. E. Jin, M. Piao, J. H. Choi and G. T. Kim, Phys. Chem. Chem. Phys., 2014, 16, 18370
    DOI: 10.1039/C4CP02337D

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