Synthesis and Terahertz Applications of Large-Area Monolayer Graphene

Simple item page
dc.contributor.advisorKono, Junichiro
dc.contributor.advisorAjayan, Pulickel
dc.creatorWang, Minjie
dc.date.accessioned2017-08-01T16:00:41Z
dc.date.available2017-08-01T16:00:41Z
dc.date.created2016-12
dc.date.issued2016-11-22
dc.date.submittedDecember 2016
dc.date.updated2017-08-01T16:00:41Z
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.
dc.format.mimetypeapplication/pdf
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>.
dc.identifier.urihttps://hdl.handle.net/1911/95990
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.subjectGraphene
dc.subjectTerahertz
dc.titleSynthesis and Terahertz Applications of Large-Area Monolayer Graphene
dc.typeThesis
dc.type.materialText
thesis.degree.departmentApplied Physics
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.majorApplied Physics/Electrical Eng
thesis.degree.nameDoctor of Philosophy
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
WANG-DOCUMENT-2016.pdf
Size:
3.54 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
5.84 KB
Format:
Plain Text
Description:
Download
No Thumbnail Available
Name:
LICENSE.txt
Size:
2.6 KB
Format:
Plain Text
Description:
Download
Collections
Rice University Electronic Theses and Dissertations