Kim Bo-Hyun, Lee Hojin, Kim Do Hyoung, Kim Seokho, Choi Jinho, Lee Gil Sun, Park Dong Hyuk, Lee Sunjong
Korea Institute of Industrial Technology, Chenan, Chungnam 31056, Korea.
Department of Applied Organic Materials Engineering, Inha University, Incheon 22212, Korea.
Polymers (Basel). 2018 Apr 9;10(4):414. doi: 10.3390/polym10040414.
Recently, the light-matter interaction at nanoscale has attracted great interest from physicists, chemists and material scientists, as it gives peculiar optical properties that couldn't be observed at the bulk scale. The synthesis and characterization of organic-inorganic heterostructures forming quantum dots, nanowires or nanotubes provide opportunities to understand their photophysical mechanism and to apply optoelecronic devices. Herein, we report a huge enhanced luminescence in a coaxial-like heterostructured poly (3-methylthiophene) (P3MT) with Au. We electrochemically synthesized P3MT nanowires (NWs) on a nanoporous template, and sequentially deposited Au on the surface of P3MT NWs. The diameter of heterostructured P3MT/Au NWs was about 200 nm, where the cladding-shape Au were about 10 nm. The visible range absorbance, with two new absorption peaks of P3MT/Au NWs, was significantly increased compared with that of P3MT NWs. Accordingly, the photoluminescence (PL) of a P3MT/Au NW was enormously increased; up to 170 times compared to that of P3MT NWs. More interestingly, an unexpected enhancement of PL was observed from cross-junction point of P3MT/Au NWs. The abnormal PL properties of P3MT/Au NWs were attributed to the charge transfer and the surface plasmon resonance between the cladding-shape Au and the core-shape P3MT, which resulted in the enhanced quantum yield. This incites us to reconsider the light-matter interaction in polymer-metal hybrid structures applicable for high-performance optoelectronic devices.
最近，纳米尺度上的光与物质相互作用引起了物理学家、化学家和材料科学家的极大兴趣，因为它赋予了在宏观尺度上无法观察到的特殊光学性质。形成量子点、纳米线或纳米管的有机-无机异质结构的合成与表征为理解其光物理机制和应用光电器件提供了机会。在此，我们报道了一种与金形成的同轴状异质结构聚（3-甲基噻吩）（P3MT）中巨大的发光增强现象。我们在纳米多孔模板上电化学合成了P3MT纳米线（NWs），并在P3MT NWs表面依次沉积金。异质结构P3MT/Au NWs的直径约为200 nm，其中包覆状的金约为10 nm。与P3MT NWs相比，P3MT/Au NWs在可见光范围内的吸光度显著增加，出现了两个新的吸收峰。相应地，P3MT/Au NW的光致发光（PL）大幅增加；与P3MT NWs相比提高了170倍。更有趣的是，在P3MT/Au NWs的交叉点处观察到了PL的意外增强。P3MT/Au NWs异常的PL性质归因于包覆状金与核状P3MT之间的电荷转移和表面等离子体共振，这导致了量子产率的提高。这促使我们重新考虑适用于高性能光电器件的聚合物-金属混合结构中的光与物质相互作用。
