Synthesis and Terahertz Applications of Large-Area Monolayer Graphene

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dc.contributor.advisorKono, Junichiroen_US
dc.contributor.advisorAjayan, Pulickelen_US
dc.creatorWang, Minjieen_US
dc.date.accessioned2017-08-01T16:00:41Zen_US
dc.date.available2017-08-01T16:00:41Zen_US
dc.date.created2016-12en_US
dc.date.issued2016-11-22en_US
dc.date.submittedDecember 2016en_US
dc.date.updated2017-08-01T16:00:41Zen_US
dc.description.abstractMonolayer graphene, successfully isolated in 2004 for the first time, is the first member of the class of materials called two-dimensional (2D) materials. It consists of a 2D honeycomb lattice of sp2-bonded carbon atoms, possessing extraordinary mechanical, chemical, and physical properties. The unique band structure and gate tunability of graphene are expected to result in novel high-frequency (THz) and optical phenomena. In this thesis work, we used two different ways to grow graphene on a copper foil via chemical vapor deposition (CVD). One method synthesized continuous, large-size monolayer graphene, while the other method created signal-crystal graphene with no domain boundaries. We transferred grown graphene from copper foil to SiO2/Si substrates by the wet-etch method with four types of copper etchants that are commonly used by researcher: HNO3, FeCl3, (NH4)2S2O8, and a commercial copper etchant. Further tests and analysis showed that the commercial copper etchant is the best for transfer purposes from the perspective of structural integrity, amount of residues, and doping carrier concentration. We conducted strain-dependent THz transmission measurements of graphene on a polyimide substrate (Kapton) using a strain-controllable mechanical-optical testing system. Experimental results showed that THz transmittance of graphene changes significantly with strain up to ~30%, but no reversible change of THz transmittance was observed. On the other hand, by using a recently proposed total internal reflection (TIR) geometry, we demonstrated significant enhancement of THz-wave absorption in monolayer graphene. Our scheme allowed the incident THz beam to be reflected by graphene four times at varying incidence angles, both below and above the critical angle for TIR. We observed extremely large THz absorption, especially for s-polarized radiation. The experimental results are quantitatively consistent with our calculations, incorporating realistic values of carrier scattering time and Fermi energy.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationWang, Minjie. "Synthesis and Terahertz Applications of Large-Area Monolayer Graphene." (2016) Diss., Rice University. <a href="https://hdl.handle.net/1911/95990">https://hdl.handle.net/1911/95990</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/95990en_US
dc.language.isoengen_US
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.en_US
dc.subjectGrapheneen_US
dc.subjectTerahertzen_US
dc.titleSynthesis and Terahertz Applications of Large-Area Monolayer Grapheneen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.majorApplied Physics/Electrical Engen_US
thesis.degree.nameDoctor of Philosophyen_US
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