Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nano Dandelions

03.09.2007
Bundles of cysteine–lead nanowires spread into highly oriented structures

Under an electron microscope they look like dandelions. In the journal Angewandte Chemie, Xiao-Fang Shen and Xiu-Ping Yan explain their nanoscopic bouquets: They consist of spread-out bundles of nanowires made of lead and the amino acid l-cysteine. The Chinese researchers have discovered a new, cost-effective method by which ordered nanostructures can be produced on a large scale, at room temperature, and under atmospheric pressure.

The properties of nanomaterials are not determined exclusively by their chemical composition; other characteristics such as structure and morphology, as well as the form, size, and spatial distribution of the individual particles, also play a role. It is equally important for the construction of future nanocomponents that nanomaterials can be produced with controlled “architecture”. For example, one-dimensional nanoobjects, known as nanowires, are needed for the (opto)electronics of the future and for the construction of superordinate structures.

Thanks to their specific structures and fascinating penchant for self-assembly, biomaterials make particularly interesting “molds” for the production of defined inorganic nanostructures. In particular, the amino acid cysteine easily forms coordination compounds with inorganic cations and metals.

The research team at Nankai University started with an aqueous solution of cysteine and lead acetate. At room temperature and under certain conditions, spindly bundles of nanowires form. These bundles spread out to form dandelion-like structures with a highly oriented morphology.

When heated under hydrothermal conditions, these structures decompose. Depending on the reaction conditions, hierarchical lead sulfide microstructures are formed with various attractive shapes, including spherical, needle-like, and different flower-like structures. Lead sulfide is an important semiconductor.

“Our new process enables the simple, controlled synthesis of nanowires and three-dimensional lead sulfide microstructures,” summarizes Yan. “In addition, we expect to gain new insights into the fundamental processes involved in mineralization, the transformation of bioorganic nano- and microstructures into inorganic structures. This process also occurs in living organisms, in which it plays an important role.”

Author: Xiu-Ping Yan, Nankai University, Tianjin (China), mailto:xpyan@nankai.edu.cn

Title: Facile Shape-Controlled Synthesis of Well-Aligned Nanowire Architectures in Binary Aqueous Solution

Angewandte Chemie International Edition, doi: 10.1002/anie.200702451

Xiu-Ping Yan | Angewandte Chemie
Further information:
http://pressroom.angewandte.org

Further reports about: Angewandte Chemie Lead Yan inorganic microstructures sulfide

More articles from Life Sciences:

nachricht 'Y' a protein unicorn might matter in glaucoma
23.10.2017 | Georgia Institute of Technology

nachricht Microfluidics probe 'cholesterol' of the oil industry
23.10.2017 | Rice University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Salmonella as a tumour medication

HZI researchers developed a bacterial strain that can be used in cancer therapy

Salmonellae are dangerous pathogens that enter the body via contaminated food and can cause severe infections. But these bacteria are also known to target...

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

3rd Symposium on Driving Simulation

23.10.2017 | Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

 
Latest News

Microfluidics probe 'cholesterol' of the oil industry

23.10.2017 | Life Sciences

Gamma rays will reach beyond the limits of light

23.10.2017 | Physics and Astronomy

The end of pneumonia? New vaccine offers hope

23.10.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>