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dc.contributor.authorKumar, Rajeev-
dc.contributor.authorKumar, Ajay-
dc.contributor.authorVerma, Nancy-
dc.contributor.authorPhilip, Reji-
dc.contributor.author+2 Co-Authors-
dc.date.accessioned2019-10-10T09:23:53Z-
dc.date.available2019-10-10T09:23:53Z-
dc.date.issued2019-11-
dc.identifier.citationCarbon, 2019, Vol.153, p545-556en_US
dc.identifier.issn0008-6223-
dc.identifier.urihttp://hdl.handle.net/2289/7310-
dc.descriptionRestricted Accessen_US
dc.description.abstractCarbonaceous materials containing Fe/Fe3C(core)-graphite(shell) nanoparticles-embedded carbon globules and carbon nanotubes are synthesized using pyrolysis. The thickness of the graphitic shell on the Fe/Fe3C nanoparticles was varied by exposing Fe-acetylacetonate and toluene precursors to different initial temperatures (reaction tube insertion temperatures) Tin. Furthermore, the thickness of the graphitic layer and the degree of graphitization along with the defect concentration in the graphitic layer was controlled by this process. A proposed mechanism for the formation of such carbonaceous nanostructures due to variation of Tin is provided. Non-linear absorption (NLA) experiments were carried out to explore the effect of graphitization and the role of defects on the laser intensity dependent NLA behaviour of these samples. We demonstrate that degree of graphitization and defect concentration in the highly graphitized layers considerably enhances the NLA behaviour of high intensity laser radiation in the material. The enhancement of NLA coefficient is mainly attributed to the excited state absorption (ESA) and free carrier absorption (FCA) processes. Our results emphasize that the reported carbonaceous materials with optimum amount of defects in the graphitized framework are attractive for optical limiting in laser safety applications.en_US
dc.language.isoenen_US
dc.publisherElesvier B.V.en_US
dc.relation.urihttps://doi.org/10.1016/j.carbon.2019.07.058en_US
dc.rights2018 Elsevier Ltd.en_US
dc.subjectPyrolysisen_US
dc.subjectCore-shell nanoparticlesen_US
dc.subjectIron carbideen_US
dc.subjectCarbon nanotubesen_US
dc.subjectNon-linear opticsen_US
dc.titleModulating non-linear optical absorption through controlled graphitization of carbon nanostructures containing Fe3C-graphite core-shell nanoparticlesen_US
dc.typeArticleen_US
dc.additionalSupplementary Information Availableen_US
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