Pouring oil on troubled reactions

 
Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanomaterial
View previous topic :: View next topic  
Author Message
nanoorg
Site Admin


Joined: 16 Mar 2004
Posts: 1392

PostPosted: Thu Oct 19, 2006 12:14 pm    Post subject: Pouring oil on troubled reactions Reply with quote

Pouring oil on troubled reactions

By Michael Spencelayh



Olive oil can be used for cheap and clean synthesis of quantum dots, according to scientists in Germany.

Quantum dots (semiconducting nanocrystals) are used in the production of light-emitting diodes and lasers, and as fluorescent labels in medical imaging. But current methods for making quantum dots are expensive and often use toxic phosphine molecules. This limits the production of the nanocrystals to the milligram scale.

A cheaper and non-toxic alternative has been devised by Sameer Sapra and co-workers at the Ludwig Maximillians University, Munich. Sapra and colleagues used ordinary olive oil as the solvent to make cadmium–selenium quantum dots, avoiding the need to use phosphines. The method could open up possibilities for mass production of the nanocrystals, said Sapra.

Olive oil is made up of fatty acids and other long-chain hydrocarbons. The synthesis works because the hydrocarbons dissolve selenium at high temperatures. Olive oil also contains oleic acid, which acts as a stabilising agent for the reaction.

Paul Mulvaney, a quantum dot expert at the University of Melbourne, Victoria, Australia, sees potential in the discovery. ‘The synthesis provides further flexibility in the design and growth of…semiconductor nanocrystals,’ said Mulvaney.

According to Sapra, the quality of the nanocrystals obtained by this route is the highest yet seen for phosphine-free methods.



Source: http://www.rsc.org/Publishing/ChemScience/



This story was first posted on 23rd August 2006.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanomaterial All times are GMT
Page 1 of 1
 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2002 phpBB Group