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The Role of Defects in Carbon Nanostructures Probed through Ion Implantation and Electrochemistry

Published online by Cambridge University Press:  01 February 2011

Mark Hoefer ,
Jeffrey Nichols  and
Prabhakar Bandaru
Mark Hoefer
Affiliation:
[email protected]@ucsd.edu, University of California, San Diego, Materials Science Program, Department of Mechanical Engineering, La Jolla, California, United States
Jeffrey Nichols
Affiliation:
[email protected], University of California, San Diego, Materials Science Program, Department of Mechanical Engineering, La Jolla, California, United States
Prabhakar Bandaru
Affiliation:
[email protected], University of California, San Diego, Materials Science Program, Department of Mechanical Engineering, La Jolla, California, United States
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Abstract

As carbon nanotubes (CNTs) inevitably contain defects, an understanding of their effect on the electrochemical behavior is crucial. We consider, through Cyclic Voltammetry and Raman Spectroscopy, the influence of both intrinsic and extrinsically introduced defects. Bamboo and hollow multi-walled carbon nanotube morphologies provided examples of the former while the controlled addition of Argon and Hydrogen ions was used for studying extrinsic defects. We show that the electrocatalytic response of the hollow type CNTs can be tailored significantly, while bamboo type CNTs have innately high reactive site densities and are less amenable to modification. Argon irradiation also differs greatly from that of Hydrogen irradiation. CNT irradiation with Argon appears to positively charge CNTs, while Hydrogen irradiation neutralizes defects further allowing for the tuning of CNT defect density. The work has implications in the design of nanotube and nanowire based chemical sensors.

Keywords

defectsnanostructureRaman spectroscopy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1142: Symposium JJ – Nanotubes, Nanowires, Nanobelts and Nanocoils–Promise, Expectations and Status , 2008 , 1142-JJ04-04
Copyright
Copyright © Materials Research Society 2009

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