Electronic excitation induced modifications in elongated iron nanoparticle encapsulated multiwalled carbon nanotubes under ion irradiation

Saikiran, V and Bazylewski, P and Sameera, I and Bhatia, Ravi and Pathak, AP and Prasad, V and Chang, GS (2018) Electronic excitation induced modifications in elongated iron nanoparticle encapsulated multiwalled carbon nanotubes under ion irradiation. In: APPLIED SURFACE SCIENCE, 439 . pp. 823-832.

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Abstract

Multi-wall carbon nanotubes (MWCNT) filled with Fe nanorods were shown to have contracted and deformed under heavy ion irradiation. In this study, 120 MeV Ag and 80 MeV Ni ion irradiation was performed to study the deformation and defects induced in iron filled MWCNT under heavy ion irradiation. The structural modifications induced due to electronic excitation by ion irradiation were investigated employing high-resolution transmission electron microscopy, micro-Raman scattering experiments, and synchrotron-based X-ray absorption and emission spectroscopy. We understand that the ion irradiation causes modifications in the Fe nanorods which result in compressions and expansions of the nanotubes, and in turn leads to the buckling of MWCNT. The G band of the Raman spectra shifts slightly towards higher wavenumber and the shoulder G' band enhances with the increase of ion irradiation fluence, where the buckling wavelength depends on the radius `r' of the nanotubes as exp(r)(0.5)]. The intensity ratio of the D to G Raman modes initially decreases at the lowest fluence, and then it increases with the increase in ion fluence. The electron diffraction pattern and the high resolution images clearly show the presence of ion induced defects on the walls of the tube and encapsulated iron nanorods. Crown Copyright (C) 2017 Published by Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	APPLIED SURFACE SCIENCE
Additional Information:	Copy right for this article belong to ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	14 Apr 2018 18:50
Last Modified:	28 Feb 2019 08:49
URI:	http://eprints.iisc.ac.in/id/eprint/59559

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