Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hard Shell, Soft Core

25.06.2008
Enzyme used as nanoreactor for semiconductor synthesis at room temperature

Semiconductors have become indispensable for modern technology. For example, oxide semiconductors such as zinc oxide (ZnO) are the materials of choice for transparent conducting layers for blue LEDs, liquid crystal displays, and solar cells.

The large-scale production of such oxide semiconductors is an energy-intensive process. In order to decrease the energy expenditure, the search is on for new production processes that work under mild conditions. Researchers at the City University of New York's Hunter College have now developed a new approach that delivers zinc oxide at room temperature.

Hiroshi Matsui and Roberto de la Rica report in the journal Angewandte Chemie that they use the enzyme urease as a “nanoreactor” for the production of crystalline zinc oxide.

... more about:
»Oxide »Semiconductor »enzyme »urease »zinc

Urease is found in plant seeds, bacteria, and various sea creatures. It splits urea into carbon dioxide and ammonia. Ammonia is an alkaline substance; when urease is active, the pH value on the surface of the enzyme rises.

Because of the negative charge on its surface, urease has a high affinity for positively charged metal ions. In a zinc nitrate solution, the zinc ions aggregate around the urease. The local pH value on the surface of the enzyme can be finely tuned to values ideal for the formation of zinc oxide. The increasing zinc ion concentration at a suitable pH value catalyzes the formation and growth of ZnO crystals. The enzyme cores thus become surrounded by nanoshells of zinc oxide. These have a diameter of about 18 nm. By using slightly modified urease molecules, the size of the zinc oxide shells can be varied.

Author: Hiroshi Matsui, Hunter College, City University of New York (USA), http://www.hunter.cuny.edu/chem/faculty_files/matsui/matsui.html

Title: Urease as a Nanoreactor for Growing Crystalline ZnO Nanoshells at Room Temperature

Angewandte Chemie International Edition 2008, 47, No. 29, 5415–5417, doi: 10.1002/anie.200801181

Hiroshi Matsui | Angewandte Chemie
Further information:
http://pressroom.angewandte.org
http://www.hunter.cuny.edu/chem/faculty_files/matsui/matsui.html

Further reports about: Oxide Semiconductor enzyme urease zinc

More articles from Life Sciences:

nachricht Topologische Quantenchemie
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

nachricht Topological Quantum Chemistry
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>