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F−V/SMS:  A New Technique for Studying the Structure and Dynamics of Single Molecules and Nanoparticles†

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Center for Nano- and Molecular Science and Technology, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712
Cite this: J. Phys. Chem. B 2004, 108, 29, 10301–10308
Publication Date (Web):April 21, 2004
https://doi.org/10.1021/jp049583f
Copyright © 2004 American Chemical Society
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    Abstract

    We recently introduced a new technique for semiconductor nanoparticle research that involves simultaneous single molecule spectroscopy (SMS) and controllable oxidation/reduction in an electronic device. This paper shows that 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. F−V/SMS data are reported for single molecules (nanoparticles) of the conjugated polymer MEH−PPV as a function of bias voltage on the device and bias sweep rate to obtain information on both the energetics and kinetics of the charge transfer (oxidation/reduction) process in situ on the nanoscale. The extensive F−V/SMS data presented herein reveal that the dynamics for oxidation/reduction of MEH−PPV nanoparticles are controlled by various factors including filling of deep hole traps in the charge transporting layer of the device, the oxidation/reduction chemical “state” of the MEH−PPV molecule, and the molecular scale heterogeneity of the device.

    †

     Part of the special issue “Gerald Small Festschrift”.

    *

     Author to whom correspondence should be addressed. E-mail: [email protected].

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