The mechanical characterization of two-dimensional materials (WS2, MoS2, and graphene) and the effect of defects on young`s modulus of CVD grown single-layer graphene

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buir.advisorDana, Aykutlu
dc.contributor.authorAdilbekova, Begimai
dc.date.accessioned2017-12-15T13:34:51Z
dc.date.available2017-12-15T13:34:51Z
dc.date.copyright2017-11
dc.date.issued2017-11
dc.date.submitted2017-11-15
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Materials Science and Nanotechnology, İhsan Doğramacı Bilkent University, 2017.en_US
dc.descriptionIncludes bibliographical references (leaves 92-97).en_US
dc.description.abstractWith the first isolation of graphene two-dimensional (2D) materials attracted the enormous interest of many researchers. Owing to extraordinary properties and atomic thickness 2D materials have many applications in gas detection, electrodes, energy storage devices, field effect devices, sensors, photodetectors, solar cells, nanocomposites, actuators/ resonators, biological membranes,cancer detectors, piezoresistive pressure sensors, gas impermeable membranes, gas or liquid separation. Despite the atomic thickness, the gapless character of the graphene limits its applications in modern electronic devices. There are two strategies for solving the problem, first one is to open the band-gap in graphene and second is to explore new 2D materials. Generation of defects and applying an electrical field can increase the band-gap of graphene but defects can affect other properties of it. Therefore, there is a need for new analogs and transition metal dichalcogenides (TMDs) are the most promising ones. TMDs drew the attention of many researchers because of the remarkable electronic and optical properties. TMD materials exhibit a semiconducting nature owing to the presence of the band-gap, which is essential for the logical operations. Besides electronic properties, the mechanical properties( Young`s Modulus) play a significant role in applications of 2D materials. 2D materials are most promising candidates for flexible electronic devices, which received enormous interest in recent years. But the applied strain and other external forces can modify the structure of crystalline graphene and TMDs, consequently affect the performance and lifetime of devices. In this work, we aimed to measure the Young`s Modulus of graphene, MoS2 film, MoS2 and WS2 flakes with an Atomic Force Microscope (AFM). In addition, we sought the relation between the defect intensity and Young`s Modulus of graphene. The defects in graphene were generated by Ga+ with different doses in Focused Ion Beam (FIB). We found Young`s Moduli of graphene, MoS2 film, MoS2 and WS2 flakes to be 270 N/m, 330 N/m, 90 N/m and 140 N/m, respectively. These values are lower than those given in a literature, what might be caused by the pre-existence of unwanted defects. Also, it appeared that the introduction of defects leads to the fall in Young`s Modulus values of the graphene.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2017-12-15T13:34:51Z No. of bitstreams: 1 thesis by Begimai Adilbekova - Kopya.pdf: 7630414 bytes, checksum: 0ce8bca75dcdeba627a53d8f163dd970 (MD5)en
dc.description.provenanceMade available in DSpace on 2017-12-15T13:34:51Z (GMT). No. of bitstreams: 1 thesis by Begimai Adilbekova - Kopya.pdf: 7630414 bytes, checksum: 0ce8bca75dcdeba627a53d8f163dd970 (MD5) Previous issue date: 2017-11en
dc.description.statementofresponsibilityby Begimai Adilbekova.en_US
dc.format.extentxii, 105 leaves : illustrations (some color), charts (some color) ; 30 cmen_US
dc.identifier.itemidB110919
dc.identifier.urihttp://hdl.handle.net/11693/35683
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject2D materialsen_US
dc.subjectGrapheneen_US
dc.subjectMoS2 filmen_US
dc.subjectMoS2 flakesen_US
dc.subjectWS2 flakesen_US
dc.subjectYoung`s Modulusen_US
dc.subjectDefectsen_US
dc.titleThe mechanical characterization of two-dimensional materials (WS2, MoS2, and graphene) and the effect of defects on young`s modulus of CVD grown single-layer grapheneen_US
dc.title.alternativeİki boyutlu malzemelerin (WS2, MoS2 ve grafen) mekanik karakterizasyonu ve tek tabakalı grafeninin young katsayısının kusur yoğunluğu ile değişimien_US
dc.typeThesisen_US
thesis.degree.disciplineMaterials Science and Nanotechnology
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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