Chemical Modification of 2D materials and the ensuing properties

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dc.contributor.advisorAjayan, Pulickel M.
dc.creatorRadhakrishnan, Sruthi
dc.date.accessioned2019-05-17T13:10:16Z
dc.date.available2019-05-17T13:10:16Z
dc.date.created2017-12
dc.date.issued2017-11-22
dc.date.submittedDecember 2017
dc.date.updated2019-05-17T13:10:16Z
dc.description.abstractFunctionalization of nanomaterials is a definitive strategy to modulate them to achieve desired properties. Any functionalization introduces defects in the 2D lattice, which affect the properties of these layered materials. This thesis focuses on the effects of fluorination on the structure and properties of atomically thin-layered materials and a variety of applications of these materials in the fields from medicine to energy will be covered in this thesis. The first chapter gives an overview of nanomaterials in general, focusing more on 2D materials, their functionalization and their unique properties. To tailor to the rest of the chapters, a brief discussion about fluorinated graphene - the strategies of fluorination developed, their advantages and limitations; the structural defects introduced by fluorination and its influence on the conversion of a zero-bandgap material to a semi-conductor and the collective magnetism induced by point defects is discussed. The second chapter talks about fluoro-graphene quantum dots focusing on my work and its application in MRI and why it could potentially push the limits of MRI. FGO being a metal free agent has less contrast compared to conventional agents. Therefore, the third chapter gives a perspective on the enhancement of MRI contrast by formation of FGO-Iron oxide composite, as well as using it as utilizing the fluorescence of FGO in cellular imaging. The fourth chapter opens with the motivation from structural and functional changes in fluoro-graphene to explore fluorine functionalization in other 2D materials like h-BN, MoS2 and WS2. The new technique developed for functionalization will be compared with the existing techniques discussed in the first chapter, and point out the advantages of the method in terms of scalability, controllability etc. The modification of electronic band structure of h-BN to a wide bandgap semiconductor via introduction of defect levels will be described in detail along with the band structure calculations using DFT. An analysis of the origin of unconventional magnetic behavior induced by fluorination and room temperature ferromagnetism will be followed by its application as a magnetic semiconductor. The fifth chapter would be an extension of the fourth chapter, a discussion of the optical properties of FBN quantum dots and its modulation with the amount of fluorination will be followed by its application in biological detection. Moving on to the sixth chapter, it explores the effect of fluorination on other 2D materials like WS2 and its consequent exfoliation and transformation. With an interest in the changes in tribological properties of TMDs like WS2 with doping and gating this chapter will also study the measurement of friction in f-WS2 using AFM. The chapter closes with a study on the magnetic properties. The seventh chapter summarizes the main findings of the thesis and reviews the scope for further studies.
dc.format.mimetypeapplication/pdf
dc.identifier.citationRadhakrishnan, Sruthi. "Chemical Modification of 2D materials and the ensuing properties." (2017) Diss., Rice University. <a href="https://hdl.handle.net/1911/105571">https://hdl.handle.net/1911/105571</a>.
dc.identifier.urihttps://hdl.handle.net/1911/105571
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectfunctionalization
dc.subjectfluorination
dc.subject2D magnetic semiconductor
dc.titleChemical Modification of 2D materials and the ensuing properties
dc.typeThesis
dc.type.materialText
thesis.degree.departmentMaterials Science and NanoEngineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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