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 Helping to Transport Proteins Inside the Cell
21.11.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau

nachricht UNH researchers create a more effective hydrogel for healing wounds
21.11.2018 | University of New Hampshire

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: First diode for magnetic fields

Innsbruck quantum physicists have constructed a diode for magnetic fields and then tested it in the laboratory. The device, developed by the research groups led by the theorist Oriol Romero-Isart and the experimental physicist Gerhard Kirchmair, could open up a number of new applications.

Electric diodes are essential electronic components that conduct electricity in one direction but prevent conduction in the opposite one. They are found at the...

Im Focus: Nonstop Tranport of Cargo in Nanomachines

Max Planck researchers revel the nano-structure of molecular trains and the reason for smooth transport in cellular antennas.

Moving around, sensing the extracellular environment, and signaling to other cells are important for a cell to function properly. Responsible for those tasks...

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Optical Coherence Tomography: German-Japanese Research Alliance hosted Medical Imaging Conference

19.11.2018 | Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

 
Latest News

Helping to Transport Proteins Inside the Cell

21.11.2018 | Life Sciences

Meta-surface corrects for chromatic aberrations across all kinds of lenses

21.11.2018 | Power and Electrical Engineering

Removing toxic mercury from contaminated water

21.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>