Diagram (top) of a molecule that has been attached to two gold electrodes (yellow in the figure). Electron microscopy image (below) of a break junction. The golden metal strip is broken in the middle; in the opening created a molecule is placed on which measurements can be performed.We manufacture portable hardness tester including portable Rockwell, superficial Rockwell,Brinell, King Brinell,Pin Brinell,Webster and Barcol impressor.
FOM workgroup leaders professor Herre van der Zant and professor Jan van Ruitenbeek published these results with their team online on 17 March in the renowned journal Nature Nanotechnology.
Molecular electronics
Molecules are very small and typically just several nanometres in size.The Spectrophotometer is an instrument which measures the amount of light of a specificed wavelength which passes through a medium. A single molecule between two electrodes could be used as a highly sensitive sensor or extremely small transistor.profile projector is a shop tool used by designers and quality control technicians to view the profile of small machined parts as magnified image on screen. However the problem in developing these 'molecular electronics' is that it is difficult to make electrical contact with a single molecule. This research has resulted in a better understanding of the fundamental physical behaviour of single molecules.White soft Floor polishing pad for 15 inch machines. Ideal for high gloss dry polishing buffing of polished sealed floors. This has led to ideas for using image-charges to realise electronic molecular components.
Alignment of energy levels
Image-charges occur in a metal due to the proximity of charge, such as that on the single molecule. The image-charges in the metal in turn influence the energy levels of the molecule. It was already know that this is how image-charges play an important role in charge transport through molecules. The image-charges can strongly shift the alignment of the molecular energy levels compared to the energy levels in the metal. That is how they cause an enhanced or diminished conduction. Now for the first time the researchers have systematically described this effect for a single molecule.
Combination of expertise makes measurement possible
By combining their unique areas of expertise, researchers from Delft and Leiden jointly developed a new technique to measure the molecular conduction. The method is based on the 'mechanically guided break junction' technique,Highly capable, 3-axis non-contact video measuring machine, suitable for both simple shop-floor quality control and advanced manufacturing inspection applications ... invented by Van Ruitenbeek. In Delft, the technique has been expanded by incorporating it into a transistor. This technique makes it possible to vary the distance between the electrodes and therefore the proximity of the molecule, so that the image-charge can be influenced.Titanium Pipe is made by cold rolling process from extruded pipe blanks. They are widely used in heat exchangers and off-shore equipment. As a result of this the researchers acquired a unique mechanical and electrical control over the energy levels of the molecule. That allowed them to experimentally determine and quantify the role of the image-charges.
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