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Structure and electronic properties of molecules at interface of metal or semiconductor are of great importance in molecular semiconductor industry. The interest on molecular materials is fuelled due to its small size, highly tunable magnetic and electronic properties and plenty of choice. In addition they offer the unique self-assembling property through which one may design any complex structure, even a most complicated design as in animate systems.
We are investigating molecules on surface, especially functional molecules, using Scanning Tunnelling Microscope (STM) working at solid-liquid interface at ambient condition. STM working at solid-liquid interface offers a real time investigation of structure, dynamics etc. of molecules at interface. Self assembled monolayer of trimesic (TMA) acid is shown in the figure. TMA is a model system that self-assembles on different surfaces. Its self-assembly may be controlled by the nature of the solvent, concentration etc. The figure shows a high density structure of TMA (monolayer) controlled by concentration.
Tunneling spectroscopy is particularly interesting to understand the molecular electronic structure. A multifunctional molecular switch based on azobenzene on Au(111) surface is shown above. Modification of the molecular symmetry upon adsorption is directly reflected in tunneling spectrum.
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