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The EVENT project aims at strengthening and developing existing crisis management systems by incorporating a detector for unexpected events due to biological and chemical substances, leading to faster actions when terrorist attacks, sabotage or accidents occur. The municipal drinking water system will be used as a test bed for the development of such an event detector connected to the municipal crisis management system. Several technologies can be used for local event detection but in this project we have chosen to focus on a technique based on an "electronic tongue". By utilizing this type of non-selective sensor, we will be able to detect a plurality of events without the need of a specific sensor for each type of event.

The project consortium consists of the Swedish Sensor Centre, S-SENCE, at Linköping University, one spin-off company in the chemical sensor field (Adixen Scandinavia AB), the City of Linköping, the drinking water supplier Tekniska verken i Linköping AB and Saab Security, supplier of the crisis management system ISAK.
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Insect attacks will often lead to serious damage of growing crops, and is controlled by the use of insecticides, which often are used in preventive purposes or to late. Obviously there is a need for a system that can detect insect attacks. The BugIT project, supported by grants from the Swedish Farmers Foundation for Agricultural Research, aims to develop a system for monitoring and identification of insects in the field, which will help the farmers to optimize insect control. The final aim of the project is to have a set of measurement stations spread over a field. Each measurement station can communicate with each other, and send a collected information to a computer at the farmer.

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The electronic nose as a diagnostic tool for KOL and heart diseases

In collaboration with the Health University at LiU, a project concerning the use of an electronic nose as a diagnostic tool for KOL and heart diseases is running. It is known that both heart diseases and KOL may lead to breath disturbances, so when meeting a patient with that condition it may be difficult to diagnose the underlying cause. In this project, the patient will exhale in an alumina foil bag and the air sample is then analyzed with an electronic nose, which will be able to make the diagnosis. This project is financed by FOSS.

Instant method for the determination of cadmium

At present time, there is a large interest in measuring cadmium in cereal products, since its health hazards have recently been noticed, even at very small concentrations. This is due to the accumulative effect of cadmium in the inner organs of the body, with a very long half time, up to thirty years. The main uptake of cadmium is via the food or by smoking. The main source of cadmium in the food is cereal products.

In earlier projects it was shown that cadmium in soil extracts could be determined at trace levels by using an electronic tongue based on stripping voltammetry. The method did not work so well for the determination of cadmium in cereal products, however, which was considered due to that cadmium is very tight complexbound to proteins in the samples. Later investigations showed that if proteolytic enzymes and certain complex compounds were added to the samples, cadmium could be released from the the proteins by the action of the enzyme, a process which was additionally increased by its complexation. In this respect, the complex 8-hydroxykinolin was especially effective. In this project, this method will be further developed, where the aim is an instant method that can be used at the collection places for cereal. The project is financed by SLF.

Basic gas sensor research with the Scanning Light Pulse Technique (SLPT)

The Scanning Light Pulse Technique (SLPT) is a method to probe the local electric properties of metal-insulator- semiconductor (MIS-) devices, in our case the work function of the metal gate and chemically induced changes in it. The technique is based on local photoinduced electron-hole pair generation in a semiconductor depletion layer by a pulsed and focused laser beam, giving a transient photo current in the external circuit. The main goal of the SLPT-project is to obtain fundamental knowledge about processes and mechanisms of importance for gas sensing with field-effect devices, to develop new types of device structures and to find new gas sensitive materials, e.g. to i) optimize, in a combinatorial way, materials to be used as the gas sensitive layer of field-effect gas sensors; ii) clarify the ammonia response mechanism of catalytic metal (Pd, Pt) gates; iii) understand the relation between signal to noise ratio, gas detection limit and active area of gas sensitive field-effect devices; and iv) understand the relation between gas response and catalytic activity for devices with a lateral variation of the properties of the gas sensitive layer.

Basic and generic studies of the voltammetric electronic tongue

One research field for the voltammetric electronic tongue concerns general development and optimization. This include to increase the knowledge of various electrochemical reactions taking place on the surface of the electrodes of the electronic tongue, to develop and investigate the concept of the voltammetric electronic tongue in a generic way and to develop new concepts for liquid sensing. This means to study various electrode materials such as Au, Ir, Pt, Glassy carbon; GC, Ag, Cu, Ni, Pd, Ti, Sn, Zr) as possible working electrode materials in the electronic tongue. This work also includes optimization of pretreatment of the electrodes and to design and build a self polishing electronic tongue, which eventually will lead to a (in principle) maintenance free electronic tongue. This later approach is also interesting since it enables the use of non noble metals such as copper, silver, tin etc as electrode materials in the electronic tongue.

Responsible for this page: Mats Eriksson
Last updated: 04/27/10