"For the first time, we have created proteins that conduct current extremely well but can also function as semiconductors in transistors, for example," says Mahiar Hamedi, who developed the technique together with Anna Herland and associates at the Division for Biomolecular and Organic Electronics. The technology is described in his doctoral dissertation.
Last year Mahiar Hamedi made headlines with his invention of conductive textile fibers, which can be used to produce electronic cloth. Now he has scaled down that technology by a factor of about a thousand.
These nano fibers are produced in ordinary test tubes. One component is amyloid fibers, long, stable protein fibers that occur naturally in living organisms and can cause, among other things, nerve disorders in humans and animals. The other component is a conjugated polymer (PEDOT-S), a plastic material that conducts current. When the two are mixed in water, the plastic attaches to the fibers and forms a conductive shell that is merely a handful of atoms thick.
"The beauty of the self-assembly process is the ease under which PEDOT-S binds onto the amyloid fibrils directly in water without the need of any heat, and in a matter of a few minutes" Hamedi writes in his dissertation.
By providing the fibers with charged outgrowths, it is possible to get the molecules themselves to form desired structures. This can be an inexpensive and effective way to create extremely tiny three-dimensional electronic circuits.
Using their nano fibers as a channeling material, Mahiar Hamedi and his associates have constructed fully functional electrochemical transistors that work in the area of 0-0.5 volts.
The dissertation also describes a method for creating nano patterns in conductive plastic. As organic material is beginning to be used in more and more advanced electronic circuits, there is a need to fit a huge number of components in a tiny area. The solution is to form the plastic in a mold with structures that are smaller than the wavelength of visible light - and therefore invisible!
The dissertation Organic electronics on micro and nano fibers - from e-textiles to biomolecular nanoelectronics was publicly defended November 21, 2008. External examiner was George Malliaras, Cornell University, USA.Contact:
Åke Hjelm | idw
New approach to revolutionize the production of molecular hydrogen
22.05.2017 | Technische Universität Dresden
Photocatalyst makes hydrogen production 10 times more efficient
19.05.2017 | Kobe University
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...
23.05.2017 | Event News
22.05.2017 | Event News
17.05.2017 | Event News
23.05.2017 | Earth Sciences
23.05.2017 | Life Sciences
23.05.2017 | Physics and Astronomy