Abstract
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.
Highlights
Nano-optics is an emerging field of research that is attracting great interest from physicists, chemists and material scientists, as it provides extraordinary photophysical properties that have not been considered in the bulk scale
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
We reported giant enhancement of the photoluminescence characteristics of coaxial-shaped heterostructures of P3MT/Au NWs
Summary
Nano-optics is an emerging field of research that is attracting great interest from physicists, chemists and material scientists, as it provides extraordinary photophysical properties that have not been considered in the bulk scale. Countless organic, inorganic, and hybridized nano-structures such as quantum dots, nanowires, nanotubes and core-shell particles have been successfully synthesized [6] These nanomaterials show the extraordinary nano-optical phenomena that depend on shape, size and dimensionality [7,8]. Graphene surface-enhanced resonance Raman scattering showed a Raman signal intensity that was increased by up to ~100 times compared to that on bare substrate [19,20]. They demonstrated the picomolar sensitive and molecular selective Raman scattering characteristics on graphene substrates. The molecular photoluminescence (PL) enhancement on thin film or/and nanostructured metal has been known for several decades [21,22], the exact opposite phenomenon was simultaneously shown, whereby the PL was quenched due to the resonant energy transfer within a distance of a few nanometer [23,24]
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