Magnetic properties of microwave-plasma (thermal) chemical vapour deposited Co-filled (Fe-filled) multiwall carbon nanotubes: comparative study for magnetic device applications

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dc.contributor.authorMathur, A.
dc.contributor.authorMaity, Tuhin
dc.contributor.authorWadhwa, Shikha
dc.contributor.authorGhosh, B.
dc.contributor.authorSarma, Sweety
dc.contributor.authorRay, Sekhar C.
dc.contributor.authorKaviraj, Bhaskar
dc.contributor.authorRoy, Susanta S.
dc.contributor.authorRoy, Saibal
dc.contributor.funderTyndall National Institute, Irelanden
dc.contributor.funderNational Research Foundationen
dc.contributor.funderUniversity of South Africaen
dc.date.accessioned2021-08-26T11:45:30Z
dc.date.available2021-08-26T11:45:30Z
dc.date.issued2018-07-04
dc.date.updated2021-08-26T11:29:04Z
dc.description.abstract'Co-filled' and 'Fe-filled' multiwall carbon nanotubes (MWCNTs) were grown using microwave-plasma chemical vapour deposition (MPCVD) and thermal chemical vapour deposition (TCVD) methods respectively, and their structural and magnetic properties were studied for magnetic device applications. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show the average tube length approximate to 80-500 mu with outer (inner) diameter approximate to 20-50 (approximate to 10-20) nm for MWCNTs prepared by both methods. The diffraction peaks of both x-ray diffraction patterns show the interlayer distance, d(002) approximate to 3.36 , which is comparable to the graphite structure (d(002) = 3.35 ). The graphitic crystallite sizes (L-a) of MPCVD (TCVD) synthesized MWCNTs are approximate to 24.78 nm (approximate to 22.13 nm) as obtained from the intensity ratio of (I-D/I-G) D-peak, the disordered structure of graphite and G-peak, the C-C bond in graphitic structure of Raman spectra. The magnetization of 'Fe-filled' TCVD grown MWCNTs is much higher than 'Co-filled' MPCVD grown MWCNTs due to the formation of higher content of Fe-C and/or Fe-oxides in the MWCNT structures. The higher magnetic coercivity approximate to 2900 Oe and formation of isolated single-domain Fenanoparticles in 'Fe-filled' TCVD grown MWCNTs, as found from SEM / TEM micrographs, makes the ferromagnetic MWCNTs a promising material for the high-density magnetic recording media.en
dc.description.sponsorshipTyndall National Institute, Ireland (National Access Programme Grant no. NAP-613); National Research Foundation (Grant No. EQP13091742446 and 99677); University of South Africa (VRCSET program)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid076101en
dc.identifier.citationMathur, A., Maity, T., Wadhwa, S., Ghosh, B., Sarma, S., Ray, S. C., Kaviraj, B., Roy, S. S. and Roy, S. (2018) 'Magnetic properties of microwave-plasma (thermal) chemical vapour deposited Co-filled (Fe-filled) multiwall carbon nanotubes: comparative study for magnetic device applications', Materials Research Express, 5(7), 076101 (8pp). doi: 10.1088/2053-1591/aacddben
dc.identifier.doi10.1088/2053-1591/aacddben
dc.identifier.eissn2053-1591
dc.identifier.endpage8en
dc.identifier.issued7en
dc.identifier.journaltitleMaterials Research Expressen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/11797
dc.identifier.volume5en
dc.language.isoenen
dc.publisherIOP Publishingen
dc.rights© 2018, IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Materials Research Express. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at: https://iopscience.iop.org/article/10.1088/2053-1591en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectMWCNTsen
dc.subjectM-H loopsen
dc.subjectRaman spectraen
dc.subjectXRDen
dc.titleMagnetic properties of microwave-plasma (thermal) chemical vapour deposited Co-filled (Fe-filled) multiwall carbon nanotubes: comparative study for magnetic device applicationsen
dc.typeArticle (peer-reviewed)en
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