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Fluorescent π-conjugated polymer nanoparticles: A new synthetic approach based on nanoagglomeration via polyion association

Published online by Cambridge University Press:  23 September 2014

Chiaki Fukui  and
Hiroshi Yao
Chiaki Fukui
Affiliation:
Graduate School of Material Science, University of Hyogo, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
Hiroshi Yao*
Affiliation:
Graduate School of Material Science, University of Hyogo, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A facile method is developed to synthesize ion-based π-conjugated polymer nanoparticles. The polymer chosen is anionic poly(2-methoxy-5-propyloxysulfonate phenylene vinylene); MPS-PPV. The synthesis is based on nanoagglomeration via polyion association (termed as NAPA method) that includes polyion complex formation and subsequent globulization to fabricate nanoarchitectures in water-based liquid. Salient features include no spectral shift in the UV–vis absorption upon the nanoparticle formation, in contrast to a common observation that conjugated polymer nanoparticles made by a reprecipitation method exhibit blue shift in their peak. This behavior suggests the absence of further bending or kinking of the polymer backbone during nanoglobulization. Fluorescence peak energy is size dependent; the larger the particle size is, the lower is its fluorescence energy. This can be dominantly ascribed to the increased contribution of sole excitation of the chromophoric segments that have a long effective conjugation length. Because a small (large) particle has a large (small) surface-to-volume ratio, the blue-site (red-site) fluorescence is associated with the surface (inner) region of the polymer nanoparticles, respectively.

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Articles
Information
Journal of Materials Research , Volume 30 , Issue 1: Focus Issue: Soft Nanomaterials , 14 January 2015 , pp. 10 - 18
Copyright
Copyright © Materials Research Society 2015 

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