Tailored nanoporous gold for ultrahigh fluorescence enhancement
Tailored nanoporous gold for ultrahigh fluorescence enhancement
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DOI：
10.1039/c0cp01571g
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Chen, M. W.
中科院分区：
文献类型：
--
作者：
Lang, X. Y.;Guan, P. F.;Chen, M. W.
我们报道了独立纳米孔金的分子荧光增强，其中纳米孔度可以通过合金化和化学镀金的结合任意定制。该方法制备的纳米孔金具有独特的多孔结构，具有较大的金韧带和非常小的孔，在表面增强荧光和结构刚性方面都有显著改善。结果表明，纳米孔金的近场增强是由于邻近韧带之间的强电磁耦合以及大韧带的小孔径和大韧带的大等离激元阻尼减弱所引起的，而提高的量子产率和荧光团激发的合流效应导致了大荧光增强。
We report molecular fluorescence enhancement of free-standing nanoporous gold in which the nanoporosity can be arbitrarily tailored by the combination of dealloying and electroless gold plating. The nanoporous gold fabricated by this facile method possesses unique porous structures with large gold ligaments and very small pores, and exhibits significant improvements in surface enhanced fluorescence as well as structure rigidity. It demonstrates that the confluence effect of improved quantum yield and excitation of fluorophores is responsible for the large fluorescence enhancement due to the near-field enhancement of nanoporous gold, which arises from the strong electromagnetic coupling between neighboring ligaments and the weakening of plasmon damping of the large ligaments because of the small pore size and large ligament size, respectively.