Featured Research

from universities, journals, and other organizations

Silver proves its mettle for nanotech applications

Date:
March 20, 2010
Source:
Arizona State University
Summary:
Scientists have introduced a new method to deterministically and precisely position silver nanoparticles onto self-assembling DNA scaffolds.

A long single-strand of DNA has been folded into a triangular building platform through a process known as DNA origami. This architectural foundation was then "decorated" with one, two or three silver nanoparticles, which self-assembled at pre-determined locations on the DNA nanostructure.
Credit: Hao Yan, Yan Liu, Biodesign Institute at Arizona State University

The self-assembling properties of the DNA molecule have allowed for the construction of an intriguing range of nanoscale forms. Such nanoarchitectures may eventually find their way into a new generation of microelectronics, semiconductors, biological and chemical sensing devices and a host of biomedical applications. Now Hao Yan and Yan Liu, professors at the Biodesign Institute's Center for Single Molecule Biophysics and their collaborators have introduced a new method to deterministically and precisely position silver nanoparticles onto self-assembling DNA scaffolds.

Related Articles


In their latest research, the group used a long single-strand of DNA, which had been folded into a triangular building platform through a process known as DNA origami. This architectural foundation was then 'decorated' with one, two or three silver nanoparticles, which self-assembled at pre-determined locations on the DNA nanostructure. The group's experimental results, which appear in the advanced online edition of the journal Angewandte Chemie, demonstrate for the first time the viability of using silver, rather than the gold nanoparticles traditionally applied to DNA-tile or origami based architectures. The study was co-authored by Suchetan Pal, Zhengtao Deng, Baoquan Ding.

One of many applications for DNA scaffolds studded with nanoparticles is to perform precise sensing operations at the molecular scale. Sensitive detection of single molecules with high specificity is of great scientific interest for chemists, biologists, pharmacologists, medical researchers and those involved in environmental areas where trace analysis is required. The detailed study of human genes is but one area where improved single-molecule detection could be of enormous benefit.

In their current effort, the group sought to exploit the properties of the silver nanoparticles to increase the surface plasmon resonance -- a vibration of electrons that can give researchers clues regarding the molecular nature of the sample they are studying. "Theoretically, people predicted that a local surface plasmon resonance can be much stronger if you use silver particles compared to gold," said Yan. These locally enhanced areas between nanoparticles are referred to as electrical hot spots.

The group however, had to overcome significant obstacles to the use of silver nanoparticles. Silver tends to be much less stable than gold and can easily oxidize in its normal state. To counter this tendency, Yan and Liu's team attached multiple sulfur atoms to the backbone of the DNA strand used to make the platform for the nanoparticles. Each silver nanoparticle is then firmly held in place by nine sulfur atoms, once it is mounted on the DNA origami shape.

The new study paves the way for creating a more functional DNA architecture. "I believe this work will open doors to implement and study distance-dependent plasmonic interaction between noble nanoparticles at the single particle level," Yan said, adding that the first critical steps to creating hierarchically organized silver nanoparticle structures have now been taken.


Story Source:

The above story is based on materials provided by Arizona State University. The original article was written by Richard Harth, Biodesign Institute Science Writer. Note: Materials may be edited for content and length.


Journal Reference:

  1. Suchetan Pal, Zhengtao Deng, Baoquan Ding, Hao Yan, Yan Liu. DNA-Origami-Directed Self-Assembly of Discrete Silver-Nanoparticle Architectures. Angewandte Chemie International Edition, 2010; DOI: 10.1002/anie.201000330

Cite This Page:

Arizona State University. "Silver proves its mettle for nanotech applications." ScienceDaily. ScienceDaily, 20 March 2010. <www.sciencedaily.com/releases/2010/03/100319115629.htm>.
Arizona State University. (2010, March 20). Silver proves its mettle for nanotech applications. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2010/03/100319115629.htm
Arizona State University. "Silver proves its mettle for nanotech applications." ScienceDaily. www.sciencedaily.com/releases/2010/03/100319115629.htm (accessed October 24, 2014).

Share This



More Matter & Energy News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Instruments Make Sweet Music in Sweden

3D Printed Instruments Make Sweet Music in Sweden

Reuters - Innovations Video Online (Oct. 23, 2014) Students from Lund University's Malmo Academy of Music are believed to be the world's first band to all use 3D printed instruments. The guitar, bass guitar, keyboard and drums were built by Olaf Diegel, professor of product development, who says 3D printing allows musicians to design an instrument to their exact specifications. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins