Hyper-efficient quenching of non-conjugated pendant polymer by silver nanoparticles: A demonstration and versatile mechanistic proposition

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• 作者：Debanjana Ghosh ; Nitin Chattopadhyay ; ^{nitin.chattopadhyay@yahoo.com}
• 刊名：Chemical Physics Letters
• 出版年：2012
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：12 April, 2012
• 卷：532
• 期：Complete
• 页码：52-56
• 文件大小：427 K

摘要

Hyper-efficient quenching of fluorescence of non-conjugated polymer poly(N-vinylcarbazole) by silver nanoparticles is demonstrated. The quenching efficiency increases with an increase in the length of the polymer chain containing the pendant chromophore units. The Stern-Volmer constants (10⁹-10¹⁰ mol^鈭? dm³) are found to be orders of magnitude higher than the normal photochemical quenching processes. Although nanoparticle induced hyper-quenching is reported for conjugated polymers, similar observation in non-conjugated polymers is unprecedented. A versatile mechanism is proposed that rationalizes the hyper-quenching of both conjugated and non-conjugated polymers.