The research team, which includes collaborators from the University of Maryland, has found a simple method of sandwiching organic molecules between silicon and metal, two materials fundamental to electronic components. By doing so, the team may have overcome one of the principal obstacles in creating switches made from individual molecules, which represent perhaps the ultimate in miniaturization for the electronics industry.
The idea of using molecules as switches has been around for years, carrying the promise of components that can be produced cheaply in huge numbers, perform faster as a group than their larger silicon brethren, and use only a tiny fraction of their energy. But although there has been progress in creating the switching molecules themselves, the overall concept has been stuck on drawing boards in large part because organic molecules are delicate and tend to be damaged irreparably when subjected to one particularly stressful step in the chip-building process: attaching them to electrical contacts.
Metal forms many of these contacts in chip circuits, but getting metal onto a chip involves heating it until it evaporates, then allowing it to condense on the silicon. “Imagine what hot steam would do to your arm,” says Mariona Coll Bau, a materials scientist at NIST. “Evaporated metal is much hotter, and organic switching molecules are very fragile—they can’t stand the heat.”
Coll Bau’s team, however, found a way to cool the kitchen. They cover a surface with a non-stick material before condensing gold on top of it, allowing the metal to cool to an ultra-smooth surface. They then laminate the gold surface with the plastic used in overhead transparencies. The non-stick layer allows them to remove the laminated gold from the surface as easily as peeling off plastic wrap. Adding the organic molecules then is comparatively simple: attach the molecules to the gold and then flip the whole assembly onto a silicon base, with the organic molecules sandwiched neatly inside—and intact.
Though scientists have attempted to make sandwiches of this sort before, Coll Bau says their first-ever use of an imprinting machine finally made it possible to assemble the ingredients effectively. “The machine allows us to press the three layers together so the organic molecules contact both the silicon and gold, but without smashing or otherwise degrading them,” she says.
Coll Bau adds that “flip-chip lamination,” as the team calls it, could lead to applications beyond chip design, including biosensors, which depend on the organic and electronic worlds interacting. “The technique may prove useful as a fabrication paradigm,” she says. “It’s hard to make small things, and this might be an easier way to make them.”
* M. Coll, L.H. Miller, L.J. Richter, D.R. Hines, O.D. Jurchescu, N. Gergel-Hackett, C. Richter and C.A. Hacker. Formation of silicon-based molecular electronic structures using flip-chip lamination. Journal of the American Chemical Society, Aug. 11, 2009 (online publication), DOI 10.1021/ja901646j.
Chad Boutin | Newswise Science News
Further reports about: > Electronic Systems > Hankering > Molecular Target > NIST > Sandwich > electronic worlds interacting > flip-chip lamination > individual molecules > larger silicon brethren > molecular electronics > molecule-sized electronic components > organic molecule > sandwiching organic molecules > silicon base > switching molecules
Laser sensor LAH-G1 - optical distance sensors with measurement value display
15.08.2017 | WayCon Positionsmesstechnik GmbH
Engineers find better way to detect nanoparticles
14.08.2017 | Washington University in St. Louis
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
Researchers from the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, the Italian Space Agency (ASI), and the Instituto Geofisico--Escuela Politecnica Nacional (IGEPN) of Ecuador, showed an increasing volcanic danger on Cotopaxi in Ecuador using a powerful technique known as Interferometric Synthetic Aperture Radar (InSAR).
The Andes region in which Cotopaxi volcano is located is known to contain some of the world's most serious volcanic hazard. A mid- to large-size eruption has...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
16.08.2017 | Physics and Astronomy
16.08.2017 | Materials Sciences
16.08.2017 | Interdisciplinary Research