Beyond superquenching: Hyper-efficient energy transfer from conjugated polymers to gold nanoparticles
Beyond superquenching: Hyper-efficient energy transfer from conjugated polymers to gold nanoparticles
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DOI：
10.1073/pnas.1132025100
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发表时间：
2003-05-27
影响因子：
11.1
通讯作者：
Heeger, AJ
中科院分区：
文献类型：
--
作者：
Fan, CH;Wang, S;Heeger, AJ
金纳米颗粒猝灭阳离子聚芴的荧光，Stern-Volmer常数（K-SV）接近10（11）M-1，比任何先前报道的共轭聚合物-猝灭剂对大几个数量级，比小分子染料-猝灭剂对大9-10个数量级。K-SV与聚合物离子强度、电荷和共轭长度以及尺寸的关系纳米颗粒的光学性质表明，三个因素导致了这种非凡的效率：（i）通过快速的内部能量或电子转移放大猝灭，（ii）阳离子聚合物和阴离子纳米颗粒之间的静电相互作用，和（iii）金纳米颗粒通过有效的能量转移猝灭的能力。由于这种非常高的K-SV，即使在亚皮摩尔浓度的纳米颗粒下也可以观察到淬灭，这表明共轭聚合物与这些纳米材料的组合可以潜在地导致光学生物传感器的灵敏度提高。
Gold nanoparticles quench the fluorescence of cationic polyfluorene with Stern-Volmer constants (K-SV) approaching 10(11) M-1, several orders of magnitude larger than any previously reported conjugated polymer-quencher pair and 9-10 orders of magnitude larger than small molecule dye-quencher pairs. The dependence of K-SV on ionic strength, charge and conjugation length of the polymer, and the dimensions (and thus optical properties) of the nanoparticles suggests that three factors account for this extraordinary efficiency: (i) amplification of the quenching via rapid internal energy or electron transfer, (ii) electrostatic interactions between the cationic polymer and anionic nanoparticles, and (iii)the ability of gold nanoparticles to quench via efficient energy transfer. As a result of this extraordinarily high K-SV, quenching can be observed even at subpicomolar concentrations of nanoparticles, suggesting that the combination of conjugated polymers with these nanomaterials can potentially lead to improved sensitivity in optical biosensors.