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Three-dimensional arrays of graphenated carbon nanotubes

Published online by Cambridge University Press:  27 March 2012

Charles B. Parker ,
Akshay S. Raut ,
Billyde Brown ,
Brian R. Stoner  and
Jeffrey T. Glass
Charles B. Parker*
Affiliation:
Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina 27708
Akshay S. Raut
Affiliation:
Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina 27708
Billyde Brown
Affiliation:
Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina 27708
Brian R. Stoner
Affiliation:
RTI International, Center for Materials and Electronic Technologies, Durham, North Carolina 27709
Jeffrey T. Glass
Affiliation:
Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina 27708
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Graphene and carbon nanotubes (CNTs) are fascinating materials, both scientifically and technologically, due to their exceptional properties and potential use in applications ranging from high-frequency electronics to energy storage devices. This manuscript introduces a hybrid structure consisting of graphitic foliates grown along the length of aligned multiwalled CNTs. The foliate density and layer thickness vary as a function of deposition conditions, and a model is proposed for their nucleation and growth. The hybrid structures were studied using electron microscopy and Raman spectroscopy. The foliates consist of edges that approach the dimensions of graphene and provide enhanced charge storage capacity. Electrochemical impedance spectroscopy indicated that the weight-specific capacitance for the graphenated CNTs was 5.4× that of similar CNTs without the graphitic foliates. Pulsed charge injection measurements demonstrated a 7.3× increase in capacitance per unit area. These data suggest that this unique structure integrates the high surface charge density of the graphene edges with the high longitudinal conductivity of the CNTs and may have significant impact in charge storage and related applications.

Keywords

CPlasma-enhanced CVDEnergy storage
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 7 , 14 April 2012 , pp. 1046 - 1053
Copyright
Copyright © Materials Research Society 2012

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