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Abstract
Nanoparticles of a regioregular and soluble polythiophene were fabricated by mini-emulsion technique. The fabricated nanoparticles were characterized by optical spectroscopy and dynamic light scattering. The fluorescence quenching of these fabricated nanoparticles with 2,4-dinitrotolune (DNT) in aqueous and organic solutions was investigated. Significant fluorescence quenching was observed. The Stern-Volmer constants were determined to be higher than that of the bulk polymer in solution, indicating that the nanoparticles provide better sensitivity in DNT sensing. Strong two-photon-induced fluorescence was measured from these nanoparticles.
Acknowledgments
Financial support from the US Army Natick Soldier Research, Development and Engineering Center and National Science Foundation is gratefully acknowledged. We thank Mr. Anoop Kumar Pal for helping with the DLS experiment. Part of the research was performed while LL held the Senior National Research Council Research Associateship at US Army Natick Soldier Research, Development and Engineering Center.
Dedicated to the memory of Professor Sukant K. Tripathy.