Issue 15, 2014

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

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

Supplementary files

Article information

Article type
Paper
Submitted
23 Dec 2013
Accepted
27 Jan 2014
First published
27 Jan 2014

Phys. Chem. Chem. Phys., 2014,16, 6980-6985

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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