Superquenching of fluorescent polyelectrolytes and its applications for chemical and  biological sensing

Troy Bergstedt; Robert Jones; Roger Helgeson; Duncan W. McBranch; David G. Whitten

doi:10.1117/12.429371

15 June 2001 Superquenching of fluorescent polyelectrolytes and its applications for chemical and biological sensing

Troy Bergstedt, Robert Jones, Roger Helgeson, Duncan W. McBranch, David G. Whitten

Proceedings Volume 4279, Organic Photonic Materials and Devices III; (2001) https://doi.org/10.1117/12.429371
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

We report on the phenomenon of 'superquenching' observed for fluorescent polyelectrolytes -- conjugated and J-aggregate polymers -- in aqueous solution and in supported interfacial formats. Thus we find that for a number of substrates quenching by oppositely charged ions can occur with 'Stern- Volmer' quenching constants that are a million fold or greater than those for the quenching of similar 'molecular' chromophores by the same quenchers. The quenching can be tuned by a variety of techniques. The superquenching results from a combination of nonspecific but moderately strong association (due to a combination of Coulombic and hydrophobic interactions) between the quencher and polyelectrolyte with efficient excitonic or energy migration in the excited polymer. The effects reported here can be used in chemical and biological sensing applications.

Citation Download Citation

Troy Bergstedt, Robert Jones, Roger Helgeson, Duncan W. McBranch, and David G. Whitten "Superquenching of fluorescent polyelectrolytes and its applications for chemical and biological sensing", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); https://doi.org/10.1117/12.429371

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