A Strategy for the Maximum Fluorescence Enhancement Based on Tetrahedral Amorphous Carbon-Coated Metal Substrates
A Strategy for the Maximum Fluorescence Enhancement Based on Tetrahedral Amorphous Carbon-Coated Metal Substrates
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基于四面体非晶碳包覆金属基底的最大荧光增强策略
DOI：
10.1021/jp101767z
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发表时间：
2010-06-03
影响因子：
3.7
通讯作者：
Wang, Zhenlin
中科院分区：
文献类型：
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作者：
Liu, Fanxin;Tang, Chaojun;Wang, Zhenlin
最近有金属增强荧光（MEF）的报道。然而，如果荧光团与金属之间的距离很近，裸金属总是会淬灭发射。为了获得最大的荧光增强，关键是允许在界面处利用等离子体衬底的最大局部电场，同时要有效地减少猝灭。我们首次证明，通过在四面体非晶碳（ta-C）的超薄介质层上涂层，金属纳米结构可以实现MEF的最大增强。这一结果可归因于局部场增强和淬灭两种竞争机制的良好控制。发现10 a的ta-C层可以改变金属的等离子体共振，产生比未涂覆金属更高的局部电场，也可以减少淬火。涂层金属基材具有较高的机械性能。
Recently metal-enhanced fluorescence (MEF) has been reported. However, the bare metal would always quench the emission if the separation between the fluorophore and metal is very close. In order to get maximum fluorescence enhancement, the key point is to allow the maximum local electric field of plasmonic substrate at the interface to be used, and at the same time the quenching should be efficiently reduced. We demonstrate for the first time that by coating with an ultrathin dielectric layer of tetrahedral amorphous carbon (ta-C), an optically transparent material in the visible, the metal nanostructures can be used to realize the maximum enhancement in MEF. This result can be attributed to the well control of two competitive mechanisms of the local field enhancement and quenching. It is found that a 10 A ta-C layer can modify plasmon resonance of the metal to produce a higher local electric field than uncoated metal and can also reduce the quenching. The coated metal substrate has higher mechanical stab...