Semiconducting Cross-Linked
Polymer Nanowires Prepared
by High-Energy Single-Particle Track Reactions
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Abstract
High-energy charged particle irradiation of cross-linking
polymers
gives nanowires formed by cross-linking reactions along the ion track
trajectories. Here, the direct formation of nanowires consisting of
a conjugated polymer by single-particle nanofabrication technique
(SPNT) is investigated. Poly(9,9′-di-<i>n</i>-octylfluorene)
(PFO), regioregular poly(3-hexylthiophene) (rrP3HT), and poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]
(MEH-PPV) underwent an efficient cross-linking reaction upon irradiation,
resulting in the formation of 1-dimensional nanostructures with high
and desired aspect ratio reaching up to ∼200. The size of nanowires
was perfectly interpreted by well-sophisticated theoretical aspects
based on the statistical theory of polymer backbone configurations,
suggesting that simple cross-linking reactions of the polymers determine
the size and structure of nanowires. PFO based nanostructures exhibited
sharp and intense emission with high fluorescence quantum yield indicating
the absence of any significant inter/intra polymer chromophore interactions
in the nanowires assemblies