Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Properties revealed of amorphous carbon thin films prepared by electron-gun evaporation

11.11.2005


Massive variations in electrical conductivity observed for amorphous carbon thin films



A great deal of work has been done into understanding the physical properties of amorphous carbon (a-C). These studies have found the relative ratio of different carbon phases strongly determines the physical properties of the material.

In this work, published in AZojomo*, by B. Rebollo-Plata, R. Lozada-Morales, R. Palomino-Merino, J. A. Dávila-PintLe, O. Portillo-Moreno, O. Zelaya-Angel and S. Jiménez-Sandoval from Benemérita Universidad Autónoma de Puebla, a-C thin films grown by electron-gun evaporation (EGE) are studied. There is a limited number of works using the EGE technique to grow a-C films, and with growing interest in carbon based nanotechnology, the researchers believe it is important to widen the knowledge in this direction.


The main experimental parameter varied during growth was the source-substrate distance (SSD), and important changes in the physical properties: vibrational modes, dark conductivity and majority carrier concentration, are studied.

The research revealed that as SSD was altered, along with changes to the make up of the carbon films, there was a dramatic alteration to the electrical conductivity of the samples. The electrical conductivity of the a-C:N sample grown with a SSD of 15.5 cm, was about three orders of magnitude higher than the rest of the samples. However, for films grown with a SSD of 23.5cm the conductivity decreased by nearly seven orders of magnitude.

Dr. Ian Birkby | EurekAlert!
Further information:
http://www.azom.com/Details.asp?ArticleID=3097
http://www.azonetwork.com

More articles from Materials Sciences:

nachricht Flying: Efficiency thanks to Lightweight Air Nozzles
23.10.2017 | Technische Universität Chemnitz

nachricht Strange but true: Turning a material upside down can sometimes make it softer
20.10.2017 | Universitat Autonoma de Barcelona

All articles from Materials 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 >>>