BNNT纳米杂化材料的高偏振光发射
Highly Polarized Light Emission from 6T@BNNT Nanohybrids
摘要：
有机荧光团的偏振荧光发射已经在光子学中被广泛研究，并且越来越多地被用于单分子尺度的生物成像。然而，由于与分子自聚集成亚纳米尺度相关的去极化和淬灭效应，扩展紧凑分子组装体的极化性质是极其具有挑战性的。在这里，我们证明了氮化硼纳米管（BNNT）可以作为一个一维主机模板的BNNT内的封装α-六噻吩（6 T）的对齐，导致光学活性6T@BNNT纳米杂化。我们表明，从纳米杂化材料的荧光是强烈的偏振消光比高达700在室温下。对内径高达1.5 nm的BNNT内部的6 T取向的统计分析表明，至少80%的封装的6 T相对于BNNT轴表现出小于10°的最大偏离角。尽管在较大的BNNT中分子-分子和分子-BNNT吸附之间存在竞争，但我们的研究结果还表明，超过80%的分子沿BNNT轴显示出优先取向，偏离角小于45°。
英文摘要：
The polarized fluorescence emission of organic fluorophores has been extensively studied in photonics and is increasingly exploited in single molecule scale bio-imaging. Expanding the polarization properties of compact molecular assemblies is, however, extremely challenging due to depolarization and quenching effects associated with the self-aggregation of molecules into the sub-nanometer scale. Here we demonstrate that Boron Nitride Nanotubes (BNNTs) can act as a 1D host-template for the alignment of encapsulated a-sexithiophene (6T) inside BNNTs, leading to an optically active 6T@BNNT nanohybrid. We show that the fluorescence from the nanohybrid is strongly polarized with extinction ratios as high as 700 at room temperature. A statistical analysis of the 6T orientation inside BNNTs with inner diameter up to 1.5 nm shows that at least 80% of the encapsulated 6Ts exhibit a maximum deviation angle of less than 10° with respect to the BNNT axis. Despite a competition between molecule-molecule and molecule-BNNT adsorption in larger BNNTs, our results also show that more than 80% of the molecules display a preferential orientation along the BNNT axis with a deviation angle below 45°.
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