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Investigating and Tuning the Properties of 2-Dimensional Materials via Doping, Strain, and Optical Techniques
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Investigating and Tuning the Properties of 2-Dimensional Materials via Doping, Strain, and Optical Techniques. |
| 개인저자 | McCreary, Amber Dawn. |
| 단체저자명 | The Pennsylvania State University. Physics. |
| 발행사항 | [S.l.]: The Pennsylvania State University., 2017. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2017. |
| 형태사항 | 229 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-01B. Dissertation Abstract International |
| ISBN | 9781392335413 |
| 학위논문주기 | Thesis (Ph.D.)--The Pennsylvania State University, 2017. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-01, Section: B.
Publisher info.: Dissertation/Thesis. Advisor: Terrones, Mauricio. |
| 요약 | Since the discovery of graphene in 2004, there has been a significant amount of research dedicated to van der Waals solids, which have strong in-plane coupling and weak interlayer interactions that allows their thickness to be reduced down to few or even single layers. Along with graphene, transition metal dichalcogenides (TMDs) such as MoS2, WS2, and ReS2 are among these van der Waals solids and display remarkable properties. The research contained within this dissertation investigates the optical properties of these 2-Dimensional (2D) materials as well as utilizes substitutional doping and strain to tune their properties. Chapter 1 discusses the structure, properties, growth, and characterization of various 2D materials. In Chapter 2, the synthesis of high quality boron-doped graphene is demonstrated using atmospheric-pressure chemical vapor deposition (CVD) that was characterized by Raman, scanning tunneling microscopy, and X-ray photoelectron spectroscopy. It was also shown to have unique sensing capabilities for detecting toxic gases such as NH3 and NO2 in extremely low concentrations (i.e. parts per billion/parts per trillion). In Chapter 3, the Raman and photoluminescence (PL) of single, bi, and few-layered MoS2 grown by powder vaporization as a function of strain is studied through the development of a method to apply uniaxial strain to the material while collecting Raman and PL. Before this study, there were no reports on how the properties of few-layered MoS2 under strain were influenced by the number of layers, even though it has been shown that the transport properties of few-layers are more favorable than their monolayered counterparts. Chapter 4 addresses the significant variation in transport and optical properties found in the literature on TMDs by studying the Raman and PL of monolayered WS2 produced via different growth methods. Distinct features that indicate the degree of crystallinity in WS2 were observed and it was determined that PL is drastically more sensitive to the quality of the material than Raman spectroscopy. Finally, the optical properties of a relatively new TMD, ReS2, are investigated in Chapter 5. Due to the distorted crystal structure of ReS2, its optical and electrical properties are highly anisotropic. A detailed polarizationdependent study was performed for all of the 18 first order Raman modes for different number of layers. In addition, through a resonant Raman study, it was demonstrated that there are striking and unexpected signatures in the Raman spectrum illuminated with different laser wavelengths that need to be considered when using Raman spectroscopy to characterize the orientation of ReS2 and other anisotropic materials. |
| 일반주제명 | Physics. |
| 언어 | 영어 |
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