Congress of Chemists and Chemical Engineers of Bosnia and Herzegovina with international participation

By Toppare on 12 Kasım 2014 in Current News
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Eco-friendly digital advertising display, based on novel printable electrochromic polymers

 

 Congress of Chemists and Chemical Engineers of Bosnia and Herzegovina with international participation

10-12 October 2014

Sarajevo, Bosnia-Herzegovina

CONDUCTING POLYMERS AND THEIR APPLICATIONS

 

Prof. Dr. L. Toppare

Department of Chemistry

Middle East Technical University, 06800 ANKARA TURKEY

 

Conducting polymers attracted great attention in many research fields owing to their overwhelming characteristics like ease of processability, ability of conduct electricity, low cost, straight forward preparation techniques. Our research interests are conducting polymer based electrochromic devices, solar cells, organic light emitting diodes and biosensors.

Polymers having one of the three complementary colors (red, green, and blue) in the reduced state and high transmissivity in the oxidized state are key materials towards use in electrochromic devices and displays. For potential application of electrochromic materials in display technologies, one should have to create the entire color spectrum and this can be only achieved by having materials with additive or subtractive primary colors in their neutral states. To obtain a green color there should be at least two simultaneous absorption bands. Although the neutral state color is of great importance, the transmittance in the oxidized state is crucial too.

 

Biosensors based on conducting polymers have advantages over conventional laboratory based assays. The conventional methods are time consuming, expensive, required well trained personnel and not used for real time measurements. Nevertheless, biosensors are inexpensive, portable with minimized design, easy to handle, selective and sensitive.  In our group, a wide variety of biosensors were emerged as conducting polymer based enzyme biosensors. For these purposes, many conducting polymers which have specific groups were designed and synthesized. These polymers were utilized as immobilization matrices for biosensor construction. During immobilization, several modification structures were used in biosensor fabrication to achieve the most effective surface design for target biosensors.

 

Solar cells basically convert sunlight into electricity. With the absorption of light donor molecule’s electrons are excited from HOMO to LUMO to generate excitons. Excitons dissociate into holes and electrons. Electrons move through the acceptor molecule while the holes travel along the donor molecule. Charge carriers reaching to respective electrodes are collected. OLEDs on the other hand work oppositely generating light upon potential application. Recent developments in The Center for Solar Energy Research and Applications, METU on the OPVs and OLEDs are discussed.

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