טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentBlumer-Ganon Batya
SubjectPreparation Characterization and Self Assembly of Novel
n-Dopable Oligo Phenyl Analogs
DepartmentDepartment of Chemistry
Supervisor Professor Yoav Eichen


Abstract

Abstract

The thesis reports on the preparation of a new conductive "molecular wires" composed of 4,4' bipyridinium salt derivatives, characterization of their electrical and optical properties and studied  their ability to self assembly.

 

 

Part A

Part A is an introduction to the thesis. This part discussed the minimization methods of electronic devices using self assembly unit from the biological world and from the supramolecular field which tries to mimic the nature world. The introduction is also discussed the electronic properties and the preparation of conjugated polymers, include historical overview, discussion about the electronic and physical properties of conjugated polymers.

Since its early days, the microelectronic industry put a lot of efforts in minimization of electronic devices. The expectation about the limitation of the techniques used today attracted a great deal of attention both scientifically and technologically to fundamental subjects relating to the preparation of functional nanometric materials beyond a single molecule. In the last twenty years a number of alternative approaches were suggested for the processing and storing data as a substituted to the classic inorganic semiconductors systems. A number of different groups reported on a transformation of a DNA molecule to a conductor or a semi conductor. But in most cases, the final structure is not a molecular species, thus does not have a self assembly properties essential for a further advancement.

The only known conductive molecular spices are oligomers of conjugated polymers. The main idea beyond this research is that it’s possible to create hybrid molecular spices that include the conductive properties of conjugated oligomers and the self assembly properties of different systems which are known in their ability to self assembly.

Part B

This part discussed the preparation and characterization of new "molecular wires" composed of conjugated oligomers, studied the optical and electrical properties of these materials and studies their ability to self assembly.

In this part we have prepared and characterized a new family of n-Dopable Oligobipyridinium species. The new systems have very mild reduction potentials in solutions, some are air stable in their n-doped state. The new systems water solubility and their high electrostatic charge make them ideal candidates as electroactive components in nanowire networks. Some of the new systems show self-assembly properties and others can be easily attached to self-assembly units. We have demonstrated the possibility of using the self-assembled crystals as active media in high density, electrically controlled, data storage.