Interfacial syntheses of nanoelectronic materials: High-K perovskite oxides and electroresponsive polymeric systems

The creation of fundamental building elements for Nanoelectronics is considered one of the crucial steps for the development of Nanotechnology. This dissertation reports our original findings in four significant areas: (i) a room-temperature synthesis of ferroelectric barium titanate with size control using bolaamphiphile self-assemblies donut as templates; (ii) a fabrication STO, BTO nanocrystals and BST nano-solid-solutions of high-quality, controlled size (50-10nm) and high dielectric constant (up to 150000) using an open-bench reverse micelle system; (iii) an interfacial polymerization-crystallization for the formation of organic polymer single crystalline nanoneedles capable of fast conductance switching; and (iv) a fabrication of STO/PANI nano-composite by reverse micelle for electromechanical applications.; These investigations are based on the exploitation of surface physicochemical principles. The ferroelectric BaTiO3 nanoparticles with tetragonal crystalline structure were grown under ambient conditions inside the peptide-doughnut templates with unusual internal surface properties. Monodisperse nanoparticles between 6 nm and 12 nm were obtained by controlling the pH value of the self-assembly system. The syntheses of PEROVSKITE OXIDES nanocrystals took advantages of the surface boundary of micelles to control the reaction volume and kinetics. Polythiophenes, polyaniline and polypyrrole single crystalline nanoneedles with fast conductance switch properties were synthesized using an interfacial polymerization process with attendant crystallization. The fast conductance switching behavior of these organic polymeric nanoelements is related to their single crystalline nature. A nano-composite, STO/PANI, with insulating shell and strontium titanate embedded in organic conductor core showed a very stable and strong electrorheological effect. The synergistic ER effect observed in the nanocomposites is due to the combination of atomic polarization and electronic polarization.; The advancement of these novel approaches based on surface phenomena can serve as the basis for constructing nanoelectronic elements with a broad range of functions.