The Interaction of Localized Surface Plasmon with Graphene Based Materials
Date Issued
2012
Date
2012
Author(s)
Wang, Yu
Abstract
Graphene with its unique electrical, mechanical and thermal properties has attracted great research and technological interest. Beyond numerous possible optoelectronics applications, light emission from pristine graphene is hard to present due to the absence of band gap. In contrast, graphene oxide (GO) as a graphene derivative functionalized with oxygen-containing groups has demonstrated interesting steady-state photoluminescence (PL) emission ranged from near infrared (NIR) to blue fluorescence which can attributed to its heterogeneous atomic and electronic structures. However, the intrinsic PL quantum yield of GO which is less than ~0.1 % is relatively low, limiting its potential in technological applications and leaves the fluorescence of single-layer GO sheet remain unforeseen.
In this study, we utilizing Localized Surface Plasmons (LSP) technique as a physical fluorescence enhancing method without changing the atomic structure of GO. By presenting silver nanoparticles (Ag NPs) in the proximity of GO, the assisted absorption and radiative recombination of GO by incident light excited LSP resonance will lead to fluorescence enhancement of GO. The LSP enhanced fluorescent properties of GO thin film consist of only few-layers GO sheets are demonstrated. Moreover, with the advantage of LSP, we successfully obtained the fluorescence image of single-layer GO sheet which thickness corresponds to single atomic layer.
In the last Chapter, we took the advantage of ultra-thin graphene transparent electrode to combine it with Ag NPs for demonstrating LSP enhanced photocurrent of the organic polymer photodetector. The optical properties of LSP affected active material under the device structure were also studied by utilizing supercontinnum laser system, which enabled the analysis with various excitation and emission wavelengths.
Subjects
surface plasmon
graphene
graphene oxide
Type
thesis
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