Optical characterization of molybdenum disulfide by raman and photoluminescence
In this thesis, Raman and PL spectroscopy of MoS2 layers are investigated. It could be divided into three parts: (1) The resonant Raman spectra in few layer MoS2 are observed when samples excited by 325 nm laser. The significance of this work is to determine the value of SO splitting in single layer...
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| Format: | Thesis |
| Language: | English |
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2016
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| Online Access: | https://hdl.handle.net/10356/66936 |
| _version_ | 1811694719105761280 |
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| author | Sun, Linfeng |
| author2 | Shen Zexiang |
| author_facet | Shen Zexiang Sun, Linfeng |
| author_sort | Sun, Linfeng |
| collection | NTU |
| description | In this thesis, Raman and PL spectroscopy of MoS2 layers are investigated. It could be divided into three parts: (1) The resonant Raman spectra in few layer MoS2 are observed when samples excited by 325 nm laser. The significance of this work is to determine the value of SO splitting in single layer MoS2 experimentally; (2) The origin of strong PL spectra of CVD grown single layer MoS2 are investigated by comparing the PL spectra of CVD grown and ME smaples. Combined with the first principles calculations, this work reveals the intrinsic reason for the abnormally strong PL intensity in CVD grown MoS2. This work guides us a way to engineer MoS2 layers for its potential application in light emitting devices; (3) MoS2 nanosheets are used as the substrate of surface enhanced Raman scattering in this work. The defects introduced during the plasma treatment in MoS2 nanosheets are helpful to enhance the Raman signal of detected analytes. In summary, this work introduces the fundamental properties of MoS2 layers by Raman and PL spectroscopy and investigates its potential applications on electronics, biosensors and so on. |
| first_indexed | 2024-10-01T07:12:02Z |
| format | Thesis |
| id | ntu-10356/66936 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:12:02Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/669362023-02-28T23:53:06Z Optical characterization of molybdenum disulfide by raman and photoluminescence Sun, Linfeng Shen Zexiang School of Physical and Mathematical Sciences DRNTU::Science::Physics In this thesis, Raman and PL spectroscopy of MoS2 layers are investigated. It could be divided into three parts: (1) The resonant Raman spectra in few layer MoS2 are observed when samples excited by 325 nm laser. The significance of this work is to determine the value of SO splitting in single layer MoS2 experimentally; (2) The origin of strong PL spectra of CVD grown single layer MoS2 are investigated by comparing the PL spectra of CVD grown and ME smaples. Combined with the first principles calculations, this work reveals the intrinsic reason for the abnormally strong PL intensity in CVD grown MoS2. This work guides us a way to engineer MoS2 layers for its potential application in light emitting devices; (3) MoS2 nanosheets are used as the substrate of surface enhanced Raman scattering in this work. The defects introduced during the plasma treatment in MoS2 nanosheets are helpful to enhance the Raman signal of detected analytes. In summary, this work introduces the fundamental properties of MoS2 layers by Raman and PL spectroscopy and investigates its potential applications on electronics, biosensors and so on. DOCTOR OF PHILOSOPHY (SPMS) 2016-05-05T08:46:12Z 2016-05-05T08:46:12Z 2016 Thesis Sun, L. (2016). Optical characterization of molybdenum disulfide by raman and photoluminescence. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/66936 10.32657/10356/66936 en 127 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics Sun, Linfeng Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title | Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title_full | Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title_fullStr | Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title_full_unstemmed | Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title_short | Optical characterization of molybdenum disulfide by raman and photoluminescence |
| title_sort | optical characterization of molybdenum disulfide by raman and photoluminescence |
| topic | DRNTU::Science::Physics |
| url | https://hdl.handle.net/10356/66936 |
| work_keys_str_mv | AT sunlinfeng opticalcharacterizationofmolybdenumdisulfidebyramanandphotoluminescence |