Biomedical subjects

Leonhard Grill

Publications and source records attributed to Leonhard Grill.

3 recordsLinked to original sources

PubMed2006

Electric field-induced isomerization of azobenzene by STM.

The electric field applied between the tip of a scanning tunneling microscope and a metallic surface is shown to induce the reversible trans-cis isomerization of single azobenzene derivatives adsorbed on a Au(111) surface. The investigated molecule is symmetrically equipped with four tert-butyl groups, which decouple the azobenzene core from the metallic surface, facilitating the formation of highly ordered islands. Due to the spatial extension of the electric field, it is possible to switch many molecules within the same island simultaneously.

Journal Article↗

PubMed2006

Exploring the interatomic forces between tip and single molecules during STM manipulation.

The interaction between a single molecule and the STM tip during intramolecular manipulation is investigated in detail. We show that the conformational change of complex organic molecules can be induced reversibly and very reliably by using exclusively attractive forces. By studying the dependence of this process on the bias voltage and the tip position, the driving forces are characterized. Different regimes of tip-molecule interactions are observed as a function of the distance.

Journal Article↗

PubMed2005

Controlling the electronic interaction between a molecular wire and its atomic scale contacting pad.

We report a quantitative study on the electronic interaction between a molecular wire and its atomic scale metallic contacting pad. A so-called "reactive Lander" molecule is manipulated using a low-temperature scanning tunneling microscope to form a planar one-end electronic contact. The increase of the STM contrast at the junction location is discussed by means of the electronic interaction between the contacting group of the molecular wire and the end atoms of the nanopad.

Electric Conductivity↗