[MOS] MOS, Paul Barbara, April 13, 2004

[Vinnie Russo]

Dear Colleagues,

The G.R. Harrison Spectroscopy Laboratory and the Department of Electrical 
Engineering and Computer Science would like to invite you to the next 
seminar in our series on Modern Optics and Spectroscopy.

Date & Time:    Tuesday, April 13, 12 noon  1 PM

Location:       Grier Room (34-401)

Speaker:                Paul Barbara, University of Texas at Austin

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


Refreshments will be served following the talk.


Abstract:

Paul Barbara, University of Texas
F-V/SMS: A New Technique for Studying the Structure and Dynamics of Single 
Molecules and Nanoparticles
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.  The new 
technique (denoted by fluorescence voltage 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 in the talk 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.




Vinnie Russo * vrusso at mit.edu  *  Office Manager
MIT; G.R. Harrison  Spectroscopy Laboratory
77 Mass. Ave., 6-014  *  Cambridge, MA  02139
(v) 617-253-9774  *  (f) 617-253-4513
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