Navigation Links
Nanoscale probe reveals interactions between surfaces and single molecules
Date:11/17/2010

As electronics become smaller and smaller the need to understand nanoscale phenomena becomes greater and greater. Because materials exhibit different properties at the nanoscale than they do at larger scales, new techniques are required to understand and to exploit these new phenomena. A team of researchers led by Paul Weiss, UCLA's Fred Kavli Chair in NanoSystems Sciences, has developed a tool to study nanoscale interactions. Their device is a dual scanning tunneling and microwave-frequency probe that is capable of measuring the interactions between single molecules and the surfaces to which the molecules are attached.

"Our probe can generate data on the physical, chemical, and electronic interactions between single molecules and substrates, the contacts to which they are attached. Just as in semiconductor devices, contacts are critical here," remarked Weiss, who directs UCLA's California NanoSystems Institute and is also a distinguished professor of chemistry and biochemistry & materials science and engineering.

The team, which also includes theoretical chemist Mark Ratner from Northwestern University and synthetic chemist James Tour from Rice University, published their findings in the peer-reviewed journal ACS Nano.

For the past 50 years, the electronics industry has endeavored to keep up with Moore's Law, the prediction made by Gordon E. Moore in 1965 that the size of transistors in integrated circuits would halve approximately every two years. The pattern of consistent decrease in the size of electronics is approaching the point where transistors will have to be constructed at the nanoscale to keep pace. However, researchers have encountered obstacles in creating devices at the nanoscale because of the difficulty of observing phenomena at such minute sizes.

The connections between components are a vital element of nanoscale electronics. In the case of molecular devices, polarizability measures the extent to which electrons of the contact interact with those of the single molecule. Two key aspects of polarizability measurements are the ability to do the measurement on a surface with subnanometer resolution, and the ability to understand and to control molecular switches in both the on and off states.

To measure the polarizability of single molecules the research team developed a probe capable of simultaneous scanning tunneling microscopy (STM) measurements and microwave difference frequency (MDF) measurements. With the MDF capabilities of the probe, the team was able to locate single molecule switches on substrates, even when the switches were in the off state, a key capability lacking in previous techniques. Once the team located the switches, they could use the STM to change the state to on or off and to measure the interactions in each state between the single molecule switches and the substrate.

The new information provided by the team's probe focuses on what the limits of electronics will be, rather than targeting devices for production. Also, because the probe is capable of a wide variety of measurements including physical, chemical and electronic it could enable researchers to identify submolecular structures in complex biomolecules and assemblies.


'/>"/>

Contact: Jennifer Marcus
jmarcus@cnsi.ucla.edu
310-267-4839
University of California - Los Angeles
Source:Eurekalert

Related biology technology :

1. Pitt-led team develops nanoscale light sensor compatible with Etch-a-Sketch nanoelectronic platform
2. Electron billiards in nanoscale circuits
3. ORNL scientists reveal battery behavior at the nanoscale
4. NASA funds development of nanoscale materials for high energy density lithium-ion batteries
5. Nanoscale DNA sequencing could spur revolution in personal health care
6. High definition diagnostic ultrasonics on the nanoscale
7. New nanoscale transistors allow sensitive probing inside cells
8. Researchers develop ultra-simple method for creating nanoscale gold coatings
9. Superconductors on the nanoscale
10. Penn material scientists turn light into electrical current using a golden nanoscale system
11. Small optical force can budge nanoscale objects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/2/2016)... , ... December 01, 2016 , ... ... tube systems for North American hospitals, will present its chain-of-custody solution for tracking ... Exhibition in Las Vegas, Nev., Dec. 4-8, 2016. , Aerocom has a proven ...
(Date:12/2/2016)... Washington, DC (PRWEB) , ... ... ... Technologies Consortiumâ„¢ (ETC), a consortium of pharmaceutical and biotechnology companies dedicated to ... is seeking companies interested in supplying a vendor-supported, portable online UHPLC, with ...
(Date:11/30/2016)... ... November 30, 2016 , ... ... magnet Voice Coil Actuator with a flexure design that ensures high alignment accuracy ... cost-effective pricing and is ideally suited where extreme precision is required, such as ...
(Date:11/30/2016)... 2016  The Allen Institute for Cell Science ... publicly available collection of gene edited, fluorescently tagged ... cellular structures with unprecedented clarity. Distributed through the ... are a crucial first step toward visualizing the ... makes human cells healthy and what goes wrong ...
Breaking Biology Technology:
(Date:6/22/2016)... LOS ANGELES , June 22, 2016 ... of identity management and verification solutions, has ... cutting edge software solutions for Visitor Management, ... ® provides products that add functional ... The partnership provides corporations and venues with ...
(Date:6/15/2016)... , June 15, 2016 ... report titled "Gesture Recognition Market by Application Market - Global Industry ... - 2024". According to the report, the  global gesture ... in 2015 and is estimated to grow at ... billion by 2024.  Increasing application of ...
(Date:6/2/2016)... The Department of Transport Management (DOTM) ... million US Dollar project, for the , Supply ... Enrolment, and IT Infrastructure , to ... implementation of Identity Management Solutions. Numerous renowned international vendors participated ... was selected for the most compliant and innovative ...
Breaking Biology News(10 mins):