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Issue 15, 2014
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Electrical conductivity enhancement of metallic single-walled carbon nanotube networks by CoO decoration

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Abstract

We report that the decoration of metallic single-walled carbon nanotube (m-SWCNT) networks with cobalt(II) oxide (CoO) can improve the electrical conductivity of the networks. To measure the electrical conductivity, we prepared m-SWCNT networks between the source and drain electrodes of field-effect transistors (FETs). Then, the amount of CoO nanoparticles (NPs) used for decoration was controlled by treating the FETs with different volumes of a solution containing Co(NO3)2·6H2O. Atomic force microscopy imaging showed that CoO NPs were intensively deposited on the intertubular junction of the m-SWCNT networks. X-ray photoelectron spectroscopy confirmed that the oxidation state of the Co element on m-SWCNT was CoO. Raman spectra revealed that heavy decoration of CoO increased the D-band intensity of the m-SWCNT, indicating that the CoO NPs disordered the sp2 hybridized carbon atoms of the m-SWCNT via decoration. The electrical conductivity of the m-SWCNT networks was enhanced up to 28 times after decoration, and this was attributed to the CoO NPs connecting the m-SWCNTs at junctions of the networks.

Graphical abstract: Electrical conductivity enhancement of metallic single-walled carbon nanotube networks by CoO decoration

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Publication details

The article was received on 23 Dec 2013, accepted on 27 Jan 2014 and first published on 27 Jan 2014


Article type: Paper
DOI: 10.1039/C3CP55409K
Citation: Phys. Chem. Chem. Phys., 2014,16, 6980-6985
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    Electrical conductivity enhancement of metallic single-walled carbon nanotube networks by CoO decoration

    D. Kim, S. Y. Lee, J. E. Jin, G. T. Kim and D. Lee, Phys. Chem. Chem. Phys., 2014, 16, 6980
    DOI: 10.1039/C3CP55409K

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