Add to favorite
 
123
Subscribe to our Newsletters Subscribe to our Newsletters Get Daily Updates RSS


Semiconductors from Alcohol Only in Russia
March 4, 2011 23:06


A flexible display

Russian researchers have developed a simple technique for raw material preparation in order to produce electrically conducting polymers. These polymers are an essential part of flexible displays, another technological breakthrough.

Scientists from Novosibirsk (the Institute of Solid Body Chemistry and Mechanical Chemistry of Siberian branch of Russian academy of sciences) have found out that adding saturated aquatic solution of urea to alcohol promoted alcohol molecules to form fibers. When heated, mentioned mixture can turn into an organic semiconductor, called polyacetylene.

Electrically conducting polymers are of interest to researchers because of a number of unique properties. These polymers, unlike standard conductors and semiconductors, combine ability to conduct electric current with standard mechanical properties of plastic materials. Moreover, production of electrically conducting polymers is often reasonably cheap. A good example of promising applications of electrically conducting polymers is making flexible displays.

In standard state molecules of a polymer look like a ball of threads, tangled by a cat, and are not very good at conducting electricity. In order to make electron transfer between polymer molecules much more effective, one has to promote formation of intermolecular aggregates from straightened polymer chains. A Russian think-tank suggests using a common and cheap chemical compound – urea or carbamide or carbonic acid diamide – for this purpose.

 

 

 
Scientists mixed a saturated aqueous solution of urea with 10%-solution of polyvinyl alcohol (PVA) and let the mixture stand at room temperature for several days – not a complicated technological process at all. After incubation the solution was full of fibers, some of which were one centimeter long.

The effect urea had on formation of ordered structures from polyvinyl alcohol was studied by means of transmission electron microscopy. A net was put in a solution with low polyvinyl alcohol content, and then it was used as a substrate for a polymer material. Later on urea molecules were removed from a sample surface, and a net, covered with polyvinyl alcohol, was transferred to a transmission electron microscope chamber. Images, taken by means of the microscope, clearly demonstrate distinctive bands, indicating presence of filamentous formations.

Interactions between urea molecules and polyvinyl alcohol molecules were also confirmed by means of infrared spectroscopy and Raman scattering spectroscopy, which indicates that the process really happens. Urea molecules, when added to polyvinyl alcohol solution, apparently enable formation of specific filamentous aggregates and fill gaps between these aggregates as well. According to the Russian researchers, this filamentous material can be dried and used for synthesizing fibers of an organic semiconducting material – polyacetylene.

You can read more on the subject in the recent paper of the Russian chemists, published in the Russian-language science journal “Solid body physics”.

 

 

Source: Science & Technologies

Kizilova Anna


Tags: Russian Scientists     

Next Previous

You might also find interesting:

Exploring Aging Mechanisms Crystals from Novosibirsk for the Whole World Any Antioxidants Inside? The Big Bang Could Have Never Started the Universe Detector for Toxic Substances Developed









Comment on our site


RSS   twitter      submit



TAGS:
Tamara Miansarova  Russian business  Russian tourism  Book Tickets for Musicals  Eurovision  Mercedes-Benz Fashion Week Russia  bus tickets Russia FIFA  Russian oil companies  Days of Slavic Writing and Culture  Republic of Tatarstan  Russian economy  Golden Ring  winter Olympic Games  Round-the-World Cruise  Moscow  Russian Cinema  St. Petersburg  Russian Romance  Krasnoyarsk Krai  Federal Space Agency  Performances  Russian science  Dmitry Sandzhiyev  Yaroslavl   Saint Petersburg Hotels  Andrey Bilzho  Science  Best of Russia  Installations  Tula Region  St. Petersburg Museums  Russian education  Samara Airport  Monuments  Multimedia  Ice-cream Shops   Sberbank  Moscow hotels  high-speed trains  Russian scientists  Denisova Cave  Exhibitions in Moscow  Kostroma Airport  Yaroslavl Region  Victory Day  South Stream  Kola Peninsula  Nina Niss-Goldman  Moscow airports  politics 


Travel Blogs
Top Traveling Sites