Promotie: dhr. E.V. Huisman, 16.15 uur, Academiegebouw, Broerstraat 5, Groningen
Proefschrift: Electron transport through single organic molecules and self-assembled monolayers
Promotor(s): prof.dr.ir. B.J. van Wees
Faculteit: Wiskunde en Natuurwetenschappen
Contact: Eek Huisman, tel.050-363 8974, e-mail: firstname.lastname@example.org
Electron transport through single organic molecules and self-assembled monolayers
A simple molecule is about a billion times (1,000,000,000) smaller than a human being. Small is popular. For example, miniaturization of components has improved computers for many years. In that sense, a molecule is perhaps the ultimate electronic component. However, before being able to build anything sensible, one first needs to know the electronic properties of molecules. To do so you need to connect them to electrodes.
How to put a single molecule in between contacts? This thesis experimentally explores two methods. The first method very gently breaks a thin gold wire. By pulling on the wire, the diameter of the wire gradually decreases, similar to pulling on a piece of chewing gum. Pulling even further will break the wire. The contacts thus formed have very suitable dimensions for contacting a single molecule. The thesis reports on how to get molecules in between these contacts, when you equip them with ‘sticky’ sulfur atoms.
The second method contacts many layers of many molecules at the same time. Although many molecules are involved, the layer is only one molecule thick. More specifically, we investigate molecules which consist of several benzene rings in series. We find that the resistance of these molecules increases with the number of benzene rings. Also, we try to make molecules vibrate using the current.
Models for charge transport through thin layers of insulating oxides have been around for about 50 years. But are molecules really fundamentally different from these systems? This thesis also argues for a new description.
How is it possible that an albatross doesn’t crash and die when it lands? And how come its large wings don’t break due to air resistance? That is what you would expect, according to the laws of aerodynamics. However, Professor Eize Stamhuis has discovered...
‘Everybody here loves that academia has returned to Friesland. We teach, carry out research and think along about solutions to problems that are relevant for Friesland,’ says Caspar van den Berg, Professor of Global and Local Governance at the UG Campus...
On Friday 29 March, Prof. J.Th.M. De Hosson has been awarded the Royal Decoration of Knight of the Order of the Dutch Lion. He was presented with this decoration by acting Mayor Koos Wiersma of the Westerkwartier municipality directly after his valedictory...