Rice University researchers develop method to transfer entire 2D circuits to any smooth surface
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Electronically active 2D materials have been the subject of much research since the introduction of graphene in 2004. Even though they are often touted for their strength, they’re difficult to move to where they’re needed without destroying them.
The Ajayan and Lou groups, along with the lab of Rice engineer Jacob Robinson, have a new way to keep the materials and their associated circuitry, including electrodes, intact as they’re moved to curved or other smooth surfaces.
The results of their work appear in the American Chemical Society journal ACS Nano.
The Rice team tested the concept by making a 10-nanometer-thick indium selenide photodetector with gold electrodes and placing it onto an optical fiber. Because it was so close, the near-field sensor effectively coupled with an evanescent field– the oscillating electromagnetic wave that rides the surface of the fiber – and accurately detected the flow of information inside.
The benefit is that these sensors can now be imbedded into such fibers where they can monitor performance without adding weight or hindering the signal flow.
“This paper proposes several interesting possibilities for applying 2D devices in real applications,” Lou said. “For example, optical fibers at the bottom of the ocean are thousands of miles long, and if there’s a problem, it’s hard to know where it occurred. If you have these sensors at different locations, you can sense the damage to the fiber.”
Lou said labs have gotten good at transferring the growing roster of 2D materials from one surface to another, but the addition of electrodes and other components complicates the process. “Think about a transistor,” he said. “It has source, drain and gate electrodes and a dielectric (insulator) on top, and all of these have to be transferred intact. That’s a very big challenge, because all of those materials are different.”
Raw 2D materials are often moved with a layer of polymethyl methacrylate (PMMA), more commonly known as Plexiglas, on top, and the Rice researchers make use of that technique. But they needed a robust bottom layer that would not only keep the circuit intact during the move but could also be removed before attaching the device to its target. (The PMMA is also removed when the circuit reaches its destination.)
The ideal solution was polydimethylglutarimide (PMGI), which can be used as a device fabrication platform and easily etched away before transfer to the target. “We’ve spent quite some time to develop this sacrificial layer,” Lou said. PMGI appears to work for any 2D material, as the researchers experimented successfully with molybdenum diselenide and other materials as well.
The Rice labs have only developed passive sensors so far, but the researchers believe their technique will make active sensors or devices possible for telecommunication, biosensing, plasmonics and other applications.
Learn more: Form-fitting, nanoscale sensors now make sense
The Latest on: 2D circuits
via Google News
The Latest on: 2D circuits
- 2nd Circuit Applied Taxi Cab Overtime Exemption to a Chauffeur Operator on December 14, 2018 at 3:15 pm
In Munoz-Gonzalez v. D.L.C. Limousine Service, the Second Circuit Appeals Court recently held that a chauffeured transportation company fits the FLSA’s overtime “taxicab exemption” despite the company ... […]
- Empirical SCOTUS: The heightened importance of the Federal Circuit on December 14, 2018 at 2:29 pm
In terms of federal courts of appeals, the Supreme Court has only granted more cases this term from the U.S. Courts of Appeals for the 2nd, 6th, 9th and 11th Circuits. When we look at the number of ca... […]
- Moving 2D Circuits to Any Smooth Surface Could Open Way for Next-Gen Sensors on December 14, 2018 at 5:03 am
Dec 2018 HOUSTON, Dec. 14, 2018 — Atom-flat sensors, made from 2D materials, could be used to monitor performance without adding weight or hindering signal flow if they could be seamlessly integrated ... […]
- 2nd Circuit upholds Capitol win in digital music copyright case on December 12, 2018 at 7:48 pm
A federal appeals court has upheld a ruling in favor of Capitol Records finding that the defunct online music service ReDigi infringed the music company’s copyrights with a platform that allowed consu... […]
- 2nd Circuit to review investors’ ‘unprecedented’ theory in Goldman class cert appeal redux on December 12, 2018 at 12:16 pm
(Reuters) - In a highly unusual grant of a second interlocutory petition for permission to appeal, the 2nd U.S. Circuit Court of Appeals agreed Tuesday to review the certification of a class of invest... […]
- New 2D sensors can cover any smooth surface on December 7, 2018 at 6:21 am
Researchers have developed a method to transfer entire 2D circuits to any smooth surface. What if a sensor sensing a thing could be part of the thing itself? Now, engineers believe they have a two-dim... […]
- Method to transfer entire 2D circuits to any smooth surface on December 6, 2018 at 11:26 am
Engineers have developed a method to transfer complete, flexible, two-dimensional circuits from their fabrication platforms to curved and other smooth surfaces. Such circuits are able to couple with n... […]
- Researchers develop method to transfer entire 2D circuits to any smooth surface on December 6, 2018 at 9:03 am
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that. Rice engineers led by materials scientists P... […]
- 2nd Circuit Finds FBI Leaks Don't Sink Professional Gambler's Insider-Trading Conviction on December 4, 2018 at 8:34 pm
Your article was successfully shared with the contacts you provided. Photo: TZIDO SUN/Shutterstock.com The U.S. Court of Appeals for the Second Circuit upheld the insider trading conviction of former ... […]
via Bing News