Navigation Links
New synthesis method may shape future of nanostructures, clean energy
Date:9/2/2014

COLLEGE PARK, Md. -- A team of University of Maryland physicists has published new nanoscience advances that they and other scientists say make possible new nanostructures and nanotechnologies with huge potential applications ranging from clean energy and quantum computing advances to new sensor development.

Published in the September 2, issue of Nature Communications the Maryland scientists' primary discovery is a fundamentally new synthesis strategy for hybrid nanostructures that uses a connector, or "intermedium," nanoparticle to join multiple different nanoparticles into nanostructures that would be very difficult or perhaps even impossible to make with existing methods. The resultant mix and match modular component approach avoids the limitations in material choice and nanostructure size, shape and symmetry that are inherent in the crystalline growth (epitaxial) synthesis approaches currently used to build nanostructures.

"Our approach makes it possible to design and build higher order [more complex and materially varied] nanostructures with a specifically designed symmetry or shape, akin to the body's ability to make different protein oligomers each with a specific function determined by its specific composition and shape," says team leader Min Ouyang, an associate professor in the department of physics and the Maryland NanoCenter.

"Such a synthesis method is the dream of many scientists in our field and we expect researchers now will use our approach to fabricate a full class of new nanoscale hybrid structures," he says.

Among the scientists excited about this new method is the University of Delaware's Matt Doty, an associate professor of materials science and engineering, physics, and electrical and computer engineering and associate director of the UD Nanofabrication Facility. "The work of Weng and coauthors provides a powerful new tool for the 'quantum engineering' of complex nanostructures designed to implement novel electronic and optoelectronic functions. [Their] new approach makes it feasible for researchers to realize much more sophisticated nanostructure designs than were previously possible." he says.

Lighting a Way to Efficient Clean Power Generation

The team's second discovery may allow full realization of a light-generated nanoparticle effect first used by ancient Romans to create glass that changes color based on light.. This effect, known as surface plasmon resonance, involves the generation of high energy electrons using light.

More accurately explains Ouyang, plasmon resonance is the generation of a collective oscillation of low energy electrons by light. And the light energy stored in such a "plasmonic oscillator" then can be converted to energetic carriers (i.e., "hot" electrons)" for use in various applications.

In recent years, many scientists have been trying to apply this effect to the creation of more efficient photocatalysts for use in the production of clean energy. Photocatalysts are substances that use light to boost chemical reactions. Chlorophyll is a natural photocatalyst used by plants.

"The ingenious nano-assemblies that Professor Ouyang and his collaborators have fabricated, which include the novel feature of a silver-gold particle that super-efficiently harvests light, bring us a giant step nearer the so-far elusive goal of artificial photosynthesis: using sunlight to transform water and carbon dioxide into fuels and valuable chemicals," says Professor Martin Moskovits of the University of California at Santa Barbara, a widely recognized expert in this area of research and not affiliated with the paper.

Indeed, using sunlight to split water molecules into hydrogen and oxygen to produce hydrogen fuel has long been a clean energy "holy grail". However, decades of research advances have not yielded photocatalytic methods with sufficient energy efficiency to be cost effective for use in large scale water splitting applications.

"Using our new modular synthesis strategy, our UMD team created an optimally designed, plasmon-mediated photocatalytic nanostructure that is an almost 15 times more efficient than conventional photocatalysts," says Ouyang.

In studying this new photocatalyst, the scientists identified a previously unknown "hot plasmon electron-driven photocatalysis mechanism with an identified electron transfer pathway."

It is this new mechanism that makes possible the high efficiency of the UMD team's new photocatalyst. And it is a finding made possible by the precise materials control allowed by the team's new general synthesis method.

Their findings hold great promise for future advances that could make water splitting cost effective for large-scale use in creating hydrogen fuel. Such a system would allow light energy from large solar energy farms to be stored as chemical energy in the form of clean hydrogen fuel. And the UMD team's newly-discovered mechanism for creating hot (high energy) electrons should also be applicable to research involving other photo-excitation processes, according to Ouyang and his colleagues.


'/>"/>
Contact: Lee Tune
ltune@umd.edu
301-405-4679
University of Maryland
Source:Eurekalert

Related biology news :

1. Hot-spring bacteria reveal ability to use far-red light for photosynthesis
2. A semi-artificial leaf faster than natural photosynthesis
3. A first direct glimpse of photosynthesis in action
4. Molecular snapshots of oxygen formation in photosynthesis
5. Scientists watch photosynthesis in action
6. New membrane-synthesis pathways in bacteria discovered
7. New technique will accelerate genetic characterization of photosynthesis
8. Pioneering findings on the dual role of carbon dioxide in photosynthesis
9. Fast synthesis could boost drug development
10. The genome of sesame sheds new lights on oil biosynthesis
11. New research indicates causal link between vitamin D, serotonin synthesis and autism
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/19/2017)... , April 19, 2017 ... its vendor landscape is marked by the presence of ... is however held by five major players - 3M ... these companies accounted for nearly 61% of the global ... leading companies in the global military biometrics market boast ...
(Date:4/11/2017)... BEACH GARDENS, Fla. , April 11, 2017 ... identity management and secure authentication solutions, today announced ... contract by Intelligence Advanced Research Projects Activity (IARPA) ... for IARPA,s Thor program. "Innovation has ... onset and IARPA,s Thor program will allow us ...
(Date:4/5/2017)... 5, 2017  The Allen Institute for Cell Science ... a one-of-a-kind portal and dynamic digital window into the ... the first application of deep learning to create predictive ... lines and a growing suite of powerful tools. The ... and future publicly available resources created and shared by ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... ... 2017 , ... RMC Pharmaceutical Solutions, Inc. announces the opening ... manage the new site. , Tim has 25 years of pharmaceutical experience, including ... as the Director of Manufacturing and Supplier Quality Assessment. This group is ...
(Date:6/22/2017)... ... 22, 2017 , ... For the months of May and ... Spotlight series on “Cell Therapy Regulation” for its regenerative medicine followship. ... unique regulatory challenges of stem cell medical research. , Stem cell clinical trials ...
(Date:6/22/2017)... , ... June 22, 2017 , ... Charm Sciences, Inc. ... The AMPH test was determined to be appropriate as a screening test at dairies ... on the Charm EZ system, and the Charm EZ Lite system. These systems are ...
(Date:6/20/2017)... , June 20, 2017  Kibow Biotech Inc., ... to announce the issuance of a new patent covering ... hyperuricemia by the U.S. Patent and Trademark Office on ... winner of the Buzz of Bio award in 2014 ... akin to developing non-drug approaches to chronic disease. Renadyl™, ...
Breaking Biology Technology: