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Home Material Sciences Fluorocontaining Nanomaterials: Behaviour And Development

Fluorocontaining Nanomaterials: Behaviour And Development

Description

Currently, striving to miniaturization is a main direction in the computer technology, microelectronics, avionics, etc. Development of new functional materials (ultrathin films and their multilayer composites, nanoresistors, or components of micro- and nanoelectromechanical systems) plays an important role in the progress of micro- and nanoelectronics. The transition from micro- to nanoobjects implies fundamental modification of properties of a system. This is connected not only with decreasing of a number of structural components, but also with predominant role of the interface. Modification of the interface at the nano- and microlevel, as well as predeter-mined self-assembling of nanostructures into more complicated functional units, is an important aspect in formation of nanosystems. One of the important exploration fields of molecular engineering is formation of photoconductive LB films possessing the property of high thermo- and hydrolytic stability. However, use of fluorinated polymers for this purpose is not studied practically. High energy of the С–F bond (107 to 116 kcal/moth), and the ability of fluorine atoms to shorten neighbouring bonds and form hydrogen-type bonds C-H···F-C are the factors increasing the thermal stability of polymers. This is manifested most completely in the perfluorinated systems. Weak intermolecular forces acting on the air-solid interface of fluorinated polymers lead to formation of surfaces possessing extremely low surface energy. These surfaces are characterized by poor adhesion and low friction coefficient.

Permittivity constant (е) of the inter-layer isolator is of great importance in fabrication of highly-integrated chips. The lower the е value, the higher is the velocity of propagation of electric impulses. The permittivity constant mainly depends on the free volume of a macromolecule, degree of hydrophobicity, and polarizability. If one looks for a polymer combining both the mentioned properties, the fluorine-containing polyimides are of great interest, since if one introduces into the polymers’ macrochains the polyfluorinated and, especially, perfluorinated fragments, the free volume and hydrophobicity get enlarged, whereas the polarizability decreases.

Innovative Aspect and Main Advantages

New fluorocontaining functional materials based on thermostable geterochain polymers were developed for the first time.

 

Langmuir-Blodgett (LB) nanofilms.

Composite fluorinated films with nanofillers (nanodiamonds, carbon nanofibers, quasicrystals, metal (Cu, Ag) clusters). Friction factor 0.06 - 0.07, the film is incombustible and has fungistatic activity.

Areas of Application

Microelectronics (layer insulation in LSI devices, photodiodes) and electrical engineering (MEMS). Film specimens were tested in Ford Motor Co. (USA).


Fig. 1 Topographical (left) and friction (right) images of MEMS surfaces


Fig. 2 LB-technology and element LSI device


Fig. 3 Friction factors of the compositions with nanofillers:
CNF-1 – carbon nanofiber; 3q, 4q – quasicrystals; 7- MoS2

Stage of Development

The technology of obtaining of laboratory lots of the product is developed.

Contact Details

Institute of Bioorganic Chemistry and Petrochemistry of NASU
50, Kharkovskoye highway, Kiev, 02160, Ukraine
Sheludko E. V., Ph.D., Senior Research Worker
Tel.: +38-044-559-7181
Fax: +38-044-559-9800
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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