Tuesday, May 01, 2012

Experimental demonstration of a single-molecule electric motor


01/05/2012
Experimental demonstration of a single-molecule electric motor
By: Omar Gómez Rojas ID:139236

For molecules to be used as components in molecular machines, methods that couple individual molecules to external energy sources and that selectively excite motion in a given direction are required. Significant progress has been made in the construction of molecular motors powered by light and by chemical reactions but electrically driven motors have not yet been built, despite several theoretical proposals for such motors. Here we report that a butyl methyl sulphide molecule adsorbed on a copper surface can be operated as a single-molecule electric motor. Electrons from a scanning tunnelling microscope are used to drive the directional motion of the molecule in a two-terminal setup. Moreover, the temperature and electron flux can be adjusted to allow each rotational event to be monitored at the molecular scale in real time. The direction and rate of the rotation are related to the chiralities of both the molecule and the tip of the microscope (which serves as the electrode), illustrating the importance of the symmetry of the metal contacts in atomic-scale electrical devices.



Find more information on this work in: http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2012.37.html
Nature Nanotechnology 6, 625–629 (2011)

Full article in the next link:
http://www.sciencedaily.com/releases/2011/09/110904140353.htm

Experimental demonstration of a single-molecule electric motor
Department of Chemistry, Tufts University, Medford, Massachusetts 02155-5813, USA
Heather L. Tierney, Colin J. Murphy, April D. Jewell, Ashleigh E. Baber, Erin V. Iski, Harout Y. Khodaverdian, Allister F. McGuire, Nikolai Klebanov & E. Charles H. Sykes
Published online 25 March 2012
DOI: 10.1038/nnano.2011.142

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