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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Molecular Switches and Motors at Surfaces (original: SYMS, joined by CPP, O)

CPP 30.3: Hauptvortrag

Mittwoch, 2. April 2014, 10:30–11:00, HSZ 02

Operation of molecular devices and machines on surfaces — •Saw Wai Hla — Center for Nanoscale Materials, Argonne National Lab, and Ohio University, USA.

A recent emergent research direction is the development of complex molecular machines suitable to operate on solid surfaces. Unlike biological counterparts, the synthetic molecular machines may tolerate a more diverse range of conditions, and thus be advantageous for the complex functions with low power consumption suitable to operate in solid state devices. Development of such molecular devices requires testing their operation mechanisms. We use low temperature scanning tunneling microscopy, spectroscopy, and molecular manipulation schemes to investigate fundamental operations of synthetic molecular switches and molecular motors on metallic surfaces. Using inelastic electron tunneling process, individual molecules can be switched from one state to another in a controlled manner [1-4]. Controlled directional rotation of molecular motors can also be performed using the same technique. Finally, this presentation will include our latest results of controlled synchronized rotation of molecular motors on surfaces.

[1] V. Iancu, A. Deshpande, S.-W. Hla, Nano Lett. 6, 820-823 (2006). [2] V. Iancu, and S.-W. Hla, Proc. Nat. Acad. Sci. 103, 13718-13721 (2006). [3] Y.-S. Fu et al. Nano Lett. 12, 3931-3935 (2012). [4] U.G.E. Perera et al. Nature Nanotechnology 5, 46-51 (2013).