Photoluminescence Quenching of CdSe/ZnS Quantum Dots Caused by Graphene
碩士 === 國立東華大學 === 物理學系 === 100 === Graphene is a unique two-dimensional nanostructured sp2 carbon material, having interesting electronic and mechanical properties. On the other hand, quantum dots (QDs) is a nanoscale zero-dimensional semiconductor having photoluminescence wavelength depending o...
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| Format: | Others |
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2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/vg4zan |
| Summary: | 碩士 === 國立東華大學 === 物理學系 === 100 === Graphene is a unique two-dimensional nanostructured sp2 carbon material, having interesting electronic and mechanical properties. On the other hand, quantum dots (QDs) is a nanoscale zero-dimensional semiconductor having photoluminescence wavelength depending on its size. It is significant to understand the interaction between excited semiconductor QD and graphene in graphene/QDs assembly structure. Such graphene/QD combination structure may also have particular properties and offer many possibilities of interesting applications.
In this work, we study the photoluminescence quenching phenomena of QDs near grapheme oxide flakes, and the photo response of graphene/QDs devices. We found that both in DCB solution and on substrate surface, the photoluminescence of QDs could be quenched when they interact with graphene nearby. Our graphene/QDs devices showed photo response that may also related to the temperature. These results would be beneficial to apply to combination of zero-dimensional and two-dimensional material.
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