Spectroscopic Evidence of Work Function Alterations Due to Photoswitchable Monolayers on Gold Surfaces
The Journal of Physical Chemistry
Taking advantage of surfaces’ response to interfacial dipoles, a class of photochromophores (dihydroindolizine) is demonstrated to alter the work function of the underlying substrate (∼170 meV). This same molecule also provides spectroscopic signatures for correlating the change in molecular structure to the induced change in the surfaces’ electronic properties. Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) allows analysis of the characteristic dihydroindolizine C═C (1559 cm–1) and pyridinium (1643 cm–1) stretch as a function of photoexcitation. Structural assignments of this photochromophore are corroborated to density function theory calculations. Conformational changes in the monolayers appear in parallel with work function changes and are consistent with both its rate and magnitude.
Bartucci, Matthew Alan; Florian, Jan; and Ciszek, Jacob W.. Spectroscopic Evidence of Work Function Alterations Due to Photoswitchable Monolayers on Gold Surfaces. The Journal of Physical Chemistry, 117, 38: 19471−19476, 2013. Retrieved from Loyola eCommons, Chemistry: Faculty Publications and Other Works, http://dx.doi.org/10.1021/jp405710u
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Author Posting © American Chemical Society, 2013. This article is posted here by permission of the American Chemical Society for personal use, not for redistribution. The article was published in Journal of Physical Chemistry, Vol. 117, Iss. 38, September 2013, http://dx.doi.org/10.1021/jp405710u