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The inside dope
July 27, 2007A new technique may speed the development of molecular electronics
Often, things can be improved by a little 'contamination.' Steel, for example is iron with a bit of carbon mixed in. To produce materials for modern electronics, small amounts of impurities are introduced into silicon - a process called doping. It is these impurities that enable electricity to flow through the semiconductor and allow designers to control the electronic properties of the material.
Scientists at the Weizmann Institute of Science, together with colleagues from the U.S.A., recently succeeded in being the first to implement doping in the field of molecular electronics - the development of electronic components made of single layers of organic (carbon-based) molecules. Such components might be inexpensive, biodegradable, versatile and easy to manipulate. The main problem with molecular electronics, however, is that the organic materials must first be made sufficiently pure and then, ways must be found to successfully dope these somewhat delicate systems.
This is what Prof. David Cahen and postdoctoral fellow Dr. Oliver Seitz of the Weizmann Institute's Material and Interfaces Department, together with Drs. Ayelet Vilan and Hagai Cohen from the Chemical Research Support Unit and Prof. Antoine Kahn from Princeton University did. They showed that such 'contamination' is indeed possible, after they succeeded in purifying the molecular layer to such an extent that the remaining impurities did not affect the system's electrical behavior.
The scientists doped the 'clean' monolayers by irradiating the surface with UV light or weak electron beams, changing chemical bonds between the carbon atoms that make up the molecular layer. These bonds ultimately influenced electronic transport through the molecules.
This achievement was recently described in the Journal of the American Chemical Society (JACS). The researchers foresee that this method may enable scientists and electronics engineers to substantially broaden the use of these organic monolayers in the field of nanoelectronics. Dr. Seitz: 'If I am permitted to dream a little, it could be that this method will allow us to create types of electronics that are different, and maybe even more environmentally friendly, than the standard ones that are available today.'
Weizmann Institute of Science
This is what Prof. David Cahen and postdoctoral fellow Dr. Oliver Seitz of the Weizmann Institute's Material and Interfaces Department, together with Drs. Ayelet Vilan and Hagai Cohen from the Chemical Research Support Unit and Prof. Antoine Kahn from Princeton University did. They showed that such 'contamination' is indeed possible, after they succeeded in purifying the molecular layer to such an extent that the remaining impurities did not affect the system's electrical behavior.
The scientists doped the 'clean' monolayers by irradiating the surface with UV light or weak electron beams, changing chemical bonds between the carbon atoms that make up the molecular layer. These bonds ultimately influenced electronic transport through the molecules.
This achievement was recently described in the Journal of the American Chemical Society (JACS). The researchers foresee that this method may enable scientists and electronics engineers to substantially broaden the use of these organic monolayers in the field of nanoelectronics. Dr. Seitz: 'If I am permitted to dream a little, it could be that this method will allow us to create types of electronics that are different, and maybe even more environmentally friendly, than the standard ones that are available today.'
Weizmann Institute of Science
Molecular Electronics Current Events and Molecular Electronics News RSSSmall ... smaller ... smallest? ASU researchers create molecular diode
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Carbon molecule with a charge could be tomorrow's semiconductor
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Spin control: New technique sorts nanotubes by length
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Carbon nanotube measurements: latest in NIST 'how-to' series
The National Institute of Standards and Technology (NIST), in collaboration with the National Aeronautics and Space Administration (NASA), has published detailed guidelines for making essential measurements on samples of single-walled carbon nanotubes (SWCNTs). The new guide constitutes the current "best practices" for characterizing one of the most promising and heavily studied of the new generation of nanoscale materials.
Ultrafast laser spectrometer measures heat flow through molecules
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Porphyrin electron-transfer reactions observed at the molecular level
Researchers at Temple University have observed and documented electron transfer reactions on an electrode surface at the single molecule level for the first time, a discovery which could have future relevance to areas such as molecular electronics, electrochemistry, biology, catalysis, information storage, and solar energy conversion.
UIC and Japanese chemists close in on molecular switch
The electronics industry believes that when it comes to circuits, smaller is better -- and many foresee a future where electrical switches and circuits will be as tiny as single molecules.
Frozen lightning: NIST's new nanoelectronic switch
Researchers at the National Institute of Standards and Technology (NIST) have demonstrated a prototype nanoscale electronic switch that works like lightning—except for the speed.
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