Nature has inspired generations of people, offering a plethora of different materials for innovations. One such material is the molecule of the heritage, or DNA, thanks to its unique self-assembling properties. Researchers at the Nanoscience Center (NSC) of the University of Jyväskylä and BioMediTech (BMT) of the University of Tampere have now demonstrated a method to fabricate electronic devices by using DNA. The DNA itself has no part in the electrical function, but acts as a scaffold for forming a linear, pearl-necklace-like nanostructure consisting of three gold nanoparticles.
The research was funded by the Academy of Finland.
The nature of electrical conduction in nanoscale materials can differ vastly from regular, macroscale metallic structures, which have countless free electrons forming the current, thus making any effect by a single electron negligible. However, even the addition of a single electron into a nanoscale piece of metal can increase its energy enough to prevent conduction. This kind of addition of electrons usually happens via a quantum-mechanical effect called tunnelling, where electrons tunnel through an energy barrier. In this study, the electrons tunnelled from the electrode connected to a voltage source, to the first nanoparticle and onwards to the next particle and so on, through the gaps between them.
“Such single-electron devices have been fabricated within the scale of tens of nanometres by using conventional micro- and nanofabrication methods for more than two decades,” says Senior Lecturer Jussi Toppari from the NSC. Toppari has studied these structures already in his PhD work.
“The weakness of these structures has been the cryogenic temperatures needed for them to work. Usually, the operation temperature of these devices scales up as the size of the components decreases. Our ultimate aim is to have the devices working at room temperature, which is hardly possible for conventional nanofabrication methods – so new venues need to be found.”
Modern nanotechnology provides tools to fabricate metallic nanoparticles with the size of only a few nanometres. Single-electron devices fabricated from these metallic nanoparticles could function all the way up to room temperature. The NSC has long experience of fabricating such nanoparticles.
“After fabrication, the nanoparticles float in an aqueous solution and need to be organised into the desired form and connected to the auxiliary circuitry,” explains researcher Kosti Tapio. “DNA-based self-assembly together with its ability to be linked with nanoparticles offer a very suitable toolkit for this purpose.”
Gold nanoparticles are attached directly within the aqueous solution onto a DNA structure designed and previously tested by the involved groups. The whole process is based on DNA self-assembly, and yields countless of structures within a single patch. Ready structures are further trapped for measurements by electric fields.
“The superior self-assembly properties of the DNA, together with its mature fabrication and modification techniques, offer a vast variety of possibilities,” says Associate Professor Vesa Hytönen.
Electrical measurements carried out in this study demonstrated for the first time that these scalable fabrication methods based on DNA self-assembly can be efficiently utilised to fabricate single-electron devices that work at room temperature.
The Latest on: DNA-based single-electron electronic devices
via Google News
The Latest on: DNA-based single-electron electronic devices
- Walmart Black Friday 2019: the final sales including iPads and PowerBeats Proon November 29, 2019 at 2:10 pm
A streaming device for $18? Yes, please! Just plug the Roku SE into your TV with the included ... The DNA kit includes ancestry service plus more than 85 DNA-based online reports on health ...
- Every transistor has a unique quantum fingerprint—but can it be used as a form of ID?on July 28, 2019 at 5:00 pm
"Our research opens a different way of using the single-electron effect: as a security device. The importance of security is increasing day by day." As the physicists explain, the fingerprint of an ...
- Two quantum dots are better than one: Using one dot to sense changes in anotheron September 19, 2018 at 6:16 am
An electronic device using self-assembled quantum dots to detect single-electron events is a novel strategy for increasing our understanding of the physics of quantum dots and to aid the development ...
- Self-made DNA scaffold could make the production of single-electron devices far more scalableon October 14, 2016 at 3:00 pm
To organize nanoparticles into structures that are useful in electronics ... controllable DNA-based assemblies that are fully electrically characterized for use in single-electron nanoelectronics. The ...
- Researchers develop DNA-based single-electron electronic deviceson October 13, 2016 at 11:18 am
“Such single-electron devices have been fabricated within the scale of tens ... and connected to the auxiliary circuitry,” explains researcher Kosti Tapio. “DNA-based self-assembly together with its ...
- DNA-based single-electron electronic devices createdon October 12, 2016 at 5:00 pm
Nature has inspired generations of people, offering a plethora of different materials for innovations. One such material is the molecule of the heritage, or DNA, thanks to its unique self-assembling ...
- Scanning probe lithography for electronics at the 5nm scaleon February 18, 2013 at 4:00 pm
Electronic devices on silicon chips have been reducing steadily in size for over 40 years. From the very beginning in the 1960s, Gordon Moore predicted that the number of transistors on a silicon chip ...
- Reading and writing quantum bits on a single electron spinon September 23, 2012 at 1:24 pm
However, implementing things based on spin has proven to be far more complicated: single electron spins in atoms interact ... but long enough for electronic devices. One appealing aspect to this ...
- Scientists demonstrate more efficient way to connect nanoparticles for single-electron deviceson October 27, 2010 at 5:00 pm
(PhysOrg.com) -- By connecting single nano-objects together, scientists can fabricate tiny solid-state devices through which a precisely controlled single-electron current can flow. In the past ...
via Bing News