Featured Research

from universities, journals, and other organizations

Nanomaterials: Surrounding effects

Date:
April 12, 2012
Source:
The Agency for Science, Technology and Research (A*STAR)
Summary:
The dissipation of energy from a vibrating gold nanoparticle is strongly influenced by the surrounding environment, new research shows.

Illustration representing topography of a gold nanoring where a new method of sensing has been shown based on the damping of acoustic vibrations probed by transient absorption spectroscopy.
Credit: Copyright : A*STAR

The dissipation of energy from a vibrating gold nanoparticle is strongly influenced by the surrounding environment, new research shows.

Related Articles


Metal nanoparticles could play a key role in next-generation light detectors, optical circuits, and cancer therapies. For these future technologies to be realized, it is important to understand what happens when nanoparticles are caused to undergo vibrations, and the consequent scattering of light that can occur due to oscillations, or surface plasmons, in their free electron cloud. However, little is known about exactly how these vibrations are affected by the nanoparticle's immediate surroundings -- in particular, how the environment affects the dissipation of energy from a nanoparticle when it vibrates.

Sudhiranjan Tripathy at the A*STAR Institute of Materials Research and Engineering and co-workers, collaborating with Arnaud Arbouet and colleagues from the National Center of Scientific Research (CNRS) in France, have now analyzed the effect of different environments on individual gold nanoparticles, their acoustic vibrations and associated energy dissipation.

The researchers examined individual nanorings made of gold using transient absorption spectroscopy, which involves exciting the sample with a pulse of laser light before measuring the absorbance of light at various wavelengths. They measured both the vibration period and damping time -- the rate at which the nanoring loses its energy to its surroundings.

"When a metallic system is downsized to nanometric dimensions, its vibration modes can become very different in comparison to its bulk form," explains Tripathy. "For example, the damping of the acoustic vibrations is strongly affected by the elastic properties of the environment and the interface between the nanoparticle and its environment."

Previous spectroscopy studies have experimented with large groups of nanoparticles, but the collective approach has its limits because nanoparticles of different sizes may have different vibration periods. The researchers overcame the problem by working with individual nanorings, but the workaround did have its own difficulties.

The first challenge was the nanofabrication of perfectly controlled and characterized nano-objects. Secondly, there was the issue of detecting and monitoring the acoustic vibrations of one single metal nano-object. This meant that the researchers had to measure relative changes on the order of one in 10 million.

The researchers studied individual nanorings that were surrounded by either air or glycerol, and focused on how the different environments affected the damping time of the vibrations. This provided valuable insight into how energy dissipated from the nanorings to their environment. Most tellingly, the damping times were significantly shorter in the highly viscose glycerol.

"Our work opens up exciting perspectives including the use of metal nanoparticles as mass sensors, or as nanosized probes of the elastic properties of their local environments," says Tripathy.


Story Source:

The above story is based on materials provided by The Agency for Science, Technology and Research (A*STAR). Note: Materials may be edited for content and length.


Journal Reference:

  1. Renaud Marty, Arnaud Arbouet, Christian Girard, Adnen Mlayah, Vincent Paillard, Vivian Kaixin Lin, Siew Lang Teo, Sudhiranjan Tripathy. Damping of the Acoustic Vibrations of Individual Gold Nanoparticles. Nano Letters, 2011; 11 (8): 3301 DOI: 10.1021/nl201668t

Cite This Page:

The Agency for Science, Technology and Research (A*STAR). "Nanomaterials: Surrounding effects." ScienceDaily. ScienceDaily, 12 April 2012. <www.sciencedaily.com/releases/2012/04/120412105058.htm>.
The Agency for Science, Technology and Research (A*STAR). (2012, April 12). Nanomaterials: Surrounding effects. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2012/04/120412105058.htm
The Agency for Science, Technology and Research (A*STAR). "Nanomaterials: Surrounding effects." ScienceDaily. www.sciencedaily.com/releases/2012/04/120412105058.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Obama Reveals Nuclear Breakthrough on Landmark India Trip

Obama Reveals Nuclear Breakthrough on Landmark India Trip

Reuters - News Video Online (Jan. 25, 2015) In a glow of bonhomie, U.S. President Barack Obama and Indian Prime Minister Narendra Modi unveil a deal aimed at unlocking billions of dollars in nuclear trade. Pavithra George reports. Video provided by Reuters
Powered by NewsLook.com
NTSB: Missing Planes' Black Boxes Should Transmit Wirelessly

NTSB: Missing Planes' Black Boxes Should Transmit Wirelessly

Newsy (Jan. 23, 2015) In light of high-profile plane disappearances in the past year, the NTSB has called for changes to make finding missing aircraft easier. Video provided by Newsy
Powered by NewsLook.com
Iconic Metal Toy Meccano Goes Robotic

Iconic Metal Toy Meccano Goes Robotic

Reuters - Innovations Video Online (Jan. 22, 2015) Classic children&apos;s toy Meccano has gone digital, releasing a programmable kit robot that can be controlled by voice recognition. The toymakers say Meccanoid G15 KS is easy to use and is compatible with existing Meccano pieces. Jim Drury reports. Video provided by Reuters
Powered by NewsLook.com
The VueXL From VX1 Immersive Smartphone Headset!

The VueXL From VX1 Immersive Smartphone Headset!

Rumble (Jan. 22, 2015) The VueXL from VX1 is a product that you install your smartphone in and with the magic of magnification lenses, enlarges your smartphones screen so that it&apos;s like looking at a big screen TV. Check it out! Video provided by Rumble
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