Navigation Links
Mysterious charge transport in self-assembled monolayer transistors unraveled

An international team of researchers from the Netherlands, Russia and Austria discovered that monolayer coverage and channel length set the mobility in self-assembled monolayer field-effect transistors (SAMFETs). This opens the door to extremely sensitive chemical sensors that can be produced in a cost-effective way. The research was done at Philips Research Eindhoven and Eindhoven University of Technology. The findings were published as an Advanced Online Publication in Nature Nanotechnology.


The SAMFET is a recent example of the development of 'plastic micro-electronics'- i.e. electronics based on organic materials. Last year, Philips Research managed to build such a transistor by immersing a silicon substrate into solution containing liquid crystalline molecules that self-assemble onto this substrate, resulting in a semi-conductive layer of just a single molecule thick. The monolayer of the SAMFET consists of molecules that are standing upright. Conduction takes place by charges jumping from one molecule to the other.

However, in previous attempts to make a SAMFET, it was observed that as the length of the SAMFET increased, its level of conductivity counterintuitively decreased exponentially. In a joint project Philips Research, the Eindhoven University of Technology (TU/e), the University of Groningen, the Holst Centre, the Enikolopov Institute for Synthetical Polymer Materials in Moscow and the Technical University in Graz, Austria discovered that this decrease is determined by the monolayer coverage, which could be explained with a widely applicable two-dimensional percolation model.

The ultimate chemical sensor

One could compare this to crossing a river by jumping from rock to rock. The closer the rocks are to each other, the quicker one can jump or even walk to the other river bank. So if the monolayer displays more voids, the conductivity decreases dramatically. Up till now, this behavior was an uncharted area and inhibited the use of SAMFETs in applications such as sensors and plastic electronics. The SAMFET's extreme sensitivity could open doors to the development of the ultimate chemical sensor, the research team points out. "If we go back to that river again, another benefit of a SAMFET becomes clear", Martijn Kemerink, assistant professor at the TU/e indicates. "Imagine that there are just enough rocks to cross that river. When you remove just one rock, the effect is significant, for it is impossible to make it to the other side of the river. The SAMFET could be used to make sensors that give a large signal that is triggered by a small change", he continues.

Future steps

At present, SAMFETs are not widely used, for there are alternatives of which the production process is well-established. However, the production process of SAMFETs is extremely simple and material efficient. The transistor requires only a single layer of molecules that is applied by simple immersion into a chemical solution. The same solution can be used for many substrates, for the substrate only takes the necessary (small) amount of molecules. This makes future large-scale production of monolayer electronics efficient, simple and cost-effective.


Contact: Simon Mathijssen
Eindhoven University of Technology

Related biology technology :

1. New funding to charge energy research at UCL and the London Centre for Nanotechnology
2. Campbell Alliance Trade and Distribution Practice to Speak at CBIs Commercial Contracts and Chargeback Management Conference
3. Chindex International, Inc. Quantifies Fourth Quarter Charges
4. Carbon molecule with a charge could be tomorrows semiconductor
5. Lilly to Take Charge to Earnings Related to Pending Federal and State Investigations of Past Practices
6. T-System Releases The T SystemEV(R) 2.6.3, Featuring New Meds/Allergies Notification, Automated Charge Capture
7. A supercharged metal-ion generator
8. Boston Scientific Resolves Outstanding Litigation Matter, Finalizes Goodwill Impairment Charge
9. Authentidate Teams with Nortel to Enhance Hospital Patient Discharge and Placement Processes
10. Veteran-Owned Biotech Startup Company Charges Health Agency (NYSDOH) with Blackballing its Initiatives
11. Walsh College and Ford Motor Company Fund and Community Services Team Up To Offer New Series of Take Charge Workshops for the Unemployed
Post Your Comments:
Related Image:
Mysterious charge transport in self-assembled monolayer transistors unraveled
(Date:10/10/2017)... ... October 10, 2017 , ... ... conjugate (ADC) therapeutics, today confirmed licensing rights that give it exclusive global ... technology developed in collaboration with Children’s Hospital Los Angeles (CHLA). Additionally, ...
(Date:10/10/2017)... Parks Associates announced today that Tom Kerber , Director ... , October 11 in Scottsdale, Arizona . Kerber will ... safety and security products impact the competitive landscape. ... Parks Associates: Smart Home Devices: Main Purchase Driver ... "The residential security market has experienced continued growth, and the introduction of ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... ... recipients of 13 prestigious awards honoring scientists who have made ... in a scheduled symposium during Pittcon 2018, the world’s leading conference and exposition ...
(Date:10/9/2017)... ... October 09, 2017 , ... At its national board meeting in ... professor in Harvard University’s Departments of Physics and Astronomy, has been selected for membership ... the winning team for the 2015 Breakthrough Prize in Fundamental physics for the discovery ...
Breaking Biology Technology:
(Date:10/4/2017)... Ill. , Oct. 4, 2017  GCE Solutions, a global ... new data and document anonymization solution on October 4, 2017. Shadow ... pharmaceutical field to comply with policy 0070 of the European Medicines ... and data. ... by GCE Solutions ...
(Date:6/23/2017)... ARMONK, N.Y. and ITHACA, N.Y. ... IBM ) and Cornell University, a leader in dairy ... combined with bioinformatics designed to help reduce the chances ... breaches. With the onset of this dairy project, Cornell ... the Consortium for Sequencing the Food Supply Chain, a ...
(Date:5/6/2017)... RAM Group , Singaporean based ... in biometric authentication based on a novel  ... to perform biometric authentication. These new sensors are based on ... Ram Group and its partners. This sensor will have ... and security. Ram Group is a next generation ...
Breaking Biology News(10 mins):