Effect of temperature and chain length on the bimodal emission properties of single polyfluorene copolymer molecules
Article Abstract:
Fluorescence emission spectra were recorded for isolated polymer chains of the polyfluorene copolymer, F8BT [poly(9,9-di-n-octylfluorene-alt-benzothiadiazole)], at 298 and 20 K for two molecular weights (chain lengths). Condon analysis reveals a decrease in emitting state displacements between spectra measured at 298 and 20K, suggesting that temperature-induced structural displacements are responsible for the change in the bimodal emission.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Size-dependent spectroscopic properties of conjugated polymer nanoparticles
Article Abstract:
A detailed investigation of the ways in which spectroscopic properties of nanopraticles assembled from conjugated polymer chains evolve in the size range between single polymer chains and the bulk material is described. It is seen that the spectroscopic properties of MEH-PPV evolve rapidly as a function of nanoparticle size and achieve bulk-like properties for nanoparticles greater than 10nm in size.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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F-V/SMS: a new technique for studying the structure and dynamics of single molecules and nanoparticles
Article Abstract:
A new technique for semiconductor nanoparticle research that involves simultaneous single molecule spectroscopy (SMS) and controllable oxidation/reduction in an electronic device is described. The new technique, denoted by fluorescence-voltage single molecule spectroscopy (F-V/SMS), is analogous to current vs. voltage (I-V) measurements for devices and electrochemical cells.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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