Highly Enhanced Fluorescence Signals of Quantum Dot鈥揚olymer Composite Arrays Formed by Hybridization of Ultrathin Plasmonic Au Nanowalls

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• 作者：Soo-Yeon Cho ; Hwan-Jin Jeon ; Hae-Wook Yoo ; Kyeong Min Cho ; Woo-Bin Jung ; Jong-Seon Kim ; Hee-Tae Jung
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7273-7280
• 全文大小：640K
• ISSN：1530-6992

文摘

Enhancement of the fluorescence intensity of quantum dot (QD)鈥損olymer nanocomposite arrays is an important issue in QD studies because of the significant reduction of fluorescence signals of such arrays due to nonradiative processes in densely packed polymer chains in solid films. In this study, we enhance the fluorescence intensity of such arrays without significantly reducing their optical transparency. Enhanced fluorescence is achieved by hybridizing ultrathin plasmonic Au nanowalls onto the sidewalls of the arrays via single-step patterning and hybridization. The plasmonic Au nanowall induces metal-enhanced fluorescence, resulting in a maximum 7-fold enhancement of the fluorescence signals. We also prepare QD nanostructures of various shapes and sizes by controlling the dry etching time. In the near future, this facile approach can be used for fluorescence enhancement of colloidal QDs with plasmonic hybrid structures. Such structures can be used as optical substrates for imaging applications and for fabrication of QD鈥揕ED devices.