Navigation Links
Gold nanoparticles improve photodetector performance
Date:7/27/2013

WASHINGTON D.C. -- The mineral molybdenum disulfide (MoS2), which, when solid, behaves in many ways like grease, has semiconducting properties that make it a promising alternative to silicon or graphene in electronic devices. It also strongly absorbs visible light, and so it has been widely employed in light-sensing photodetectors, which are used in a wide range of technologies, such as environmental sensing, process control in factories, and optical communication devices.

Researchers at the National University of Singapore have now found a way to boost the performance of MoS2 photodetectors even further -- with nanoparticles of gold. They describe this improvement in the journal Applied Physics Letters, which is produced by AIP Publishing.

Wei Chen, an assistant professor of chemistry and physics, along with graduate student Jia Dan Lin, and their colleagues, applied a single, loosely arranged layer of gold nanoparticles to the top of a MoS2 photodetector. The gold layer, although less than 15 billionths of a meter thick (representing the diameter of each individual nanoparticle) and made up of fewer than 1000 individual particles, improved the photodetectors' efficiency by a factor of three, according to Chen.

"We anticipate orders of magnitude higher improvement of MoS2's sensitivity using a higher density of coated nanoparticles," Chen said.

Chen suspects that the plasmon oscillations (variations in the electron density) of individual nanoparticles -- which enhance the local optical field -- may be one reason for the improved performance of the photodetectors.

"The next step will focus on varying the materials used to make the nanoparticles, as well as their size, shape, and arrangement," Chen noted -- adjustments that will "tune" the plasmon resonance wavelength of the metal nanostructure arrays, making it possible for MoS2 photodetectors todetect multiple colors for the first time.


'/>"/>

Contact: Jason Socrates Bardi
jbardi@aip.org
240-535-4954
American Institute of Physics
Source:Eurekalert

Page: 1

Related biology technology :

1. Penn researchers develop protein passport that help nanoparticles get past immune system
2. Widely used nanoparticles enter soybean plants from farm soil
3. Nanoparticles digging the worlds smallest tunnels
4. Lung mucus gel scaffold prevents nanoparticles from getting through
5. New imaging technique homes in on electrocatalysis of nanoparticles
6. New structural information on functionalization of gold nanoparticles
7. Gold nanoparticles could treat prostate cancer with fewer side effects than chemotherapy
8. Study improves understanding of surface molecules in controlling size of gold nanoparticles
9. Nanoparticles found in moon glass bubbles explain weird lunar soil behavior
10. Nanoparticles seen as artificial atoms
11. Light touch keeps a grip on delicate nanoparticles
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/26/2017)... Linda, Ca (PRWEB) , ... May 25, 2017 , ... ... for tech innovators, engineers, and scientists from around the world, is announcing a new ... is open to both undergraduate and graduate students, 17 years or older, pursuing a ...
(Date:5/24/2017)... ... May 23, 2017 , ... ... quality relocatable and permanent modular buildings, announced the launch of the Mobile ... office design characteristics to help support on-site teamwork and collaboration. , The ...
(Date:5/24/2017)... As Ebola resurfaces in the Democratic ... suspected cases now reported, a new analysis of the Ebola ... correlation between the 2014 and 2017 outbreaks of the disease.  ... 2012-13, which preceded the 2014 outbreak. An analysis of the ... counts in 2014-15, which again precedes the current outbreak in ...
(Date:5/23/2017)... ... May 23, 2017 , ... ... human cardiovascular cells for research and the development of cardiac regeneration therapies. ... generate large numbers of cardiomyocytes (hPSC-CMs). Due to varying differentiation efficiencies, further ...
Breaking Biology Technology:
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed Anwar ... prestigious international IAIR Award for the most innovative high security ePassport and ... ... Maldives Immigration Controller General, Mr. Mohamed ... the right) have received the IAIR award for the "Most innovative high ...
(Date:3/22/2017)... 21, 2017   Neurotechnology , a provider ... today announced the release of the SentiVeillance ... improved facial recognition using up to 10 surveillance, ... computer. The new version uses deep neural-network-based facial ... it utilizes a Graphing Processing Unit (GPU) for ...
(Date:3/20/2017)... Pa. , March 20, 2017 PMD ... 2.0 personal spirometer and Wellness Management System (WMS), a ... Founded in 2010, PMD Healthcare is a Medical ... with a mission dedicated to creating innovative solutions that ... life. With that intent focus, PMD developed the first ...
Breaking Biology News(10 mins):