Synthesis of Graphene Oxide Nanoflakes and Quantum Dots by Laser Ablation
碩士 === 中原大學 === 奈米科技碩士學位學程 === 103 === In this study, graphene oxide nanoflakes and graphene oxide quantum dots were prepared using pulsed laser ablation method. Scanning Electron Microscopy(SEM) and Transmission Electron Microscopy(TEM) were used for structural analysis. In addition, the chemical...
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| Format: | Others |
| Language: | zh-TW |
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2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/33470636983136713491 |
| Summary: | 碩士 === 中原大學 === 奈米科技碩士學位學程 === 103 === In this study, graphene oxide nanoflakes and graphene oxide quantum dots were prepared using pulsed laser ablation method. Scanning Electron Microscopy(SEM) and Transmission Electron Microscopy(TEM) were used for structural analysis. In addition, the chemical structure of graphene oxide after pulsed laser ablation was studied using Ultraviolet-Vis Absorption, Raman spectroscopy and X-ray photoelectron spectra. Graphene oxide nanoflakes with different shapes were observed for the irradiation time of 10-20 mins. Photo-reduction occurs during irradiation with pulsed laser. Optical properties of the graphene oxide quantum dots were investigated using photoluminescence and time-resolved photoluminescence. An excitation-dependence of photoluminescence in graphene quantum dots was observed . We suggest that photoluminescence of graphene quantum dots originates from the recombination of the localized carriers from the zigzag-edge states.
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