Electronic Tongue ElectronicTongue.com
December, 2006
Second Announcement of ISOEN 2007 is available now at Official Page.
For more information please visit conference's Official Web Site.

December, 5th, 2006
A list of our partners is expanded.

December, 5th, 2006
New literature references added.

June, 26th, 2006
You can have a look at our research projects and relevant references.
Follow the link.

April, 4th, 2006
We developed a new ion-selective sensor, selective to nitrite ions (NO2-). All characteristics of a new sensor you can find in the table.

March, 31th, 2006
The date of ISOEN 2007 is defined. The conference will be held from 3 to 5 of May, 2007. For more info please, visit the Official Site.

March, 30th, 2006
Await soon (in 2-5 days) some new photos of working systems.

March, 9th, 2006
Our site is available in Pocket PC mode now, still with no pictures, but with full-text content. You can find it at http://pda.electronictongue.com

December, 1st, 2005
We will organize ISOEN Conference in May, 2007. Please, visit our Official Page!
 


May, 17th, 2005
Two NEW sensors were added! Their characteristics you can see at the bottom of the table with PVC-based sensors. All kinds of sensors are negotiable!

June, 30th, 2005
Now you can ask your questions to us in our forum! We'll respond you as soon as possible!

July, 29th, 2005
Our Ion-selective electrodes have got a Pattern Approval Certificate of Measuring Instruments which is registered in the State Register of Measuring Instruments of Russian Federation (Certificate №13763-05). A copy of this certificate will appear here soon!

December, 15th, 2005
Four of our new papers added to References page.



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All rights reserved, owned by Andrey V. Legin, Laboratory of chemical sensors, St.-Petersburg State University, 1995-2005
The idea of the electronic tongue - an array of non-specific chemical sensors

We are using mainly (but not exclusively) potentiometric chemical sensors for solution analysis. This is the widest, the most well-known and profoundly developed and studied class of chemical sensors. Many of earlier available sensors (conventionally called ion-selective electrodes) for solution analysis were insufficiently selective. For this reason their application for analytical purposes has been significantly restricted.
On the other hand it is possible to develop a very wide range of materials, which can display reproducible sensitivity to multiple substances in liquids. The idea of the electronic tongue approach is to develop and employ the sensors with broad sensitivity - cross-sensitivity to as many species in solutions as possible. On the basis of our knowledge and experience we can prepare and apply unique sensors displaying response to inorganic and organic substances, to ionic and non-ionic species, to the groups of chemically similar substances, etc. These sensors are stable and robust; their response is highly reproducible.
Multicomponent media
Selective sensor 1 Non-selective sensor 1
Selective sensor 1 Non-selective sensor 2
Non-selective sensor 3


Fig. 1 shows the difference between selective and non-selective, cross-sensitive sensors in the analysis of a complex media. With selective sensors (left part) one can determine only few substances in a complex liquid. With non-specific, poorly selective sensors (right part) it is possible to obtain a number of different patterns which combination can give an adequate description of the multi component analyte. For this purpose they are combined into a sensor array (sensor set).










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