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Switching of a photochromic molecule on gold electrodes: single-molecule measurements

J. He ; F. Chen ; P. A. Liddell ; Joakim Andréasson (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; S. D. Straight ; D. Gust ; T. A. Moore ; A. L. Moore ; J. Li ; O. F. Sankey ; S. M. Lindsay
Nanotechnology (0957-4484 ). Vol. 16 (2005), 6, p. 695-702.
[Artikel, refereegranskad vetenskaplig]

We have studied the electronic changes caused by light-induced isomerization of a photochromic molecule between an open state (that absorbs in the UV to become closed) and a closed state (that absorbs in the visible to become open). Data obtained using a newly developed repetitive break junction method are interpreted in terms of single-molecule resistances of 526 +/- 90 M Omega in the open form and 4 +/- 1 M Omega in the closed form when the molecule is bound between two gold contacts via dithiol linkages. The corresponding ratio of open to closed resistance is in close agreement with the results of ab initio calculations, though the measured resistances are about half of the calculated values. Optical spectroscopy indicates that the photoisomerization occurs in both directions on small gold particles, evaporated thin gold films, and in the break junction experiments.

Denna post skapades 2008-10-21. Senast ändrad 2010-09-17.
CPL Pubid: 75951


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)



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