Molecular switch will facilitate the development of pioneering electro-optical devices
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative effort, a team of physicists at the Technical University of Munich has succeeded to use single molecules as switching elements for light signals.
“Switching with just a single molecule brings future electronics one step closer to the ultimate limit of miniaturization,” says nanoscientist Joachim Reichert from the Physics Department of the Technical University of Munich.
DIFFERENT STRUCTURE – DIFFERENT OPTICAL PROPERTIES
The team initially developed a method that allowed them to create precise electrical contacts with molecules in strong optical fields and to address them using an applied voltage. At a potential difference of around one volt, the molecule changes its structure: It becomes flat, conductive and scatters light.
This optical behavior, which strongly depends on the structure of the molecule, is quite exciting for the researchers because the scattering activity – Raman scattering, in this case – can be both observed and, at the same time, switched on and off via an applied voltage.
The researchers used molecules synthesized by a team based in Basel and Karlsruhe. The molecules change their structure in a specific way when they get charged. They are arranged on a metal surface and contacted using the corner of a glass fragment with a very thin metal coating as a tip.
This serves as an electrical contact, light source and light collector, all in one. The researchers used the fragment to direct laser light to the molecule and measure tiny spectroscopic signals that vary with the applied voltage.
Establishing reliable electric contacts between individual molecules is extremely challenging from a technical point of view. The scientists have now successfully combined this procedure with single-molecule spectroscopy, allowing them to observe even the smallest structural changes in molecules with great precision.
COMPETITION FOR SILICON
One goal of molecular electronics is to develop novel devices that can replace traditional silicon-based components using integrated and directly addressable molecules.
Thanks to its tiny dimensions, this nanosystem is suitable for applications in optoelectronics, in which light needs to be switched by an electrical potential.
Learn more: Switching with molecules
The Latest on: Molecular electronics
via Google News
The Latest on: Molecular electronics
- 4 Mississippi universities tabbed for $20 million grant on September 18, 2018 at 9:18 am
The Center for Emergent Molecular Optoelectronics will develop new, unified research methodologies on organic semiconductors, an area that is vital to the advancement of diverse areas such as technolo... […]
- Molecular Assemblies Expands Patent Portfolio in Enzymatic DNA Synthesis on September 18, 2018 at 6:11 am
and bio-based electronics. Molecular Assemblies is headquartered in San Diego. For more information please visit www.molecularassemblies.com. Media Contact: Jessica Yingling, Ph.D., Little Dog Communi... […]
- Rice U. lab probes molecular limit of plasmonics on September 6, 2018 at 1:07 am
“There are so few atoms in each that adding or removing even a single electron dramatically changes their electronic behavior.” Halas’ team had experimentally verified the existence of molecular plasm... […]
- Probing molecular limit of plasmonics on September 5, 2018 at 10:12 am
"There are so few atoms in each that adding or removing even a single electron dramatically changes their electronic behavior." Halas' team had experimentally verified the existence of molecular plasm... […]
- New molecular wires for single-molecule electronic devices on August 29, 2018 at 6:55 am
Scientists at Tokyo Institute of Technology designed a new type of molecular wire doped with organometallic ruthenium to achieve unprecedentedly higher conductance than earlier molecular wires. The or... […]
- All wired up: New molecular wires for single-molecule electronic devices on August 28, 2018 at 9:47 am
Scientists have designed a new type of molecular wire doped with organometallic ruthenium to achieve unprecedentedly higher conductance than earlier molecular wires. The origin of high conductance in ... […]
- Nanoparticles Enable Molecular Electronic Devices on July 17, 2018 at 1:30 pm
Image: IBM Research-Zurich An array of molecular monolayer devices fabricated on a four-inch silicon wafer with individual contact pads for electrical characterization of single pores When, in the mid ... […]
- Beyond the limits of conventional electronics: stable organic molecular nanowires on May 23, 2018 at 7:21 am
Scientists at Tokyo Institute of Technology created the first thermally stable organic molecular nanowire devices using a single 4.5-nm-long molecule placed inside electroless gold-plated nanogap elec... […]
- Understanding charge transfers in molecular electronics on March 26, 2018 at 9:26 am
Enrique del Barco’s work will contribute to advancing the understanding of quantum technologies. Credit: University of Central Florida An international research team, which includes University of Cent... […]
via Bing News