Stock material or miscellaneous articles – Composite – Of fluorinated addition polymer from unsaturated monomers
Patent
1988-06-02
1991-01-08
Buffalow, Edith
Stock material or miscellaneous articles
Composite
Of fluorinated addition polymer from unsaturated monomers
428422, 4284247, 428458, 4284747, 4284735, 428483, 4274071, 427409, 427410, 4274121, B32B 2700
Patent
active
049834606
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the production of films having in their thickness at least two superimposed zones, including a zone with a semimetallic character and a zone with an electrical insulation character from organic polymer films, which are subjected to irradiation by means of high energy ion beams.
The structures obtained by this process have interesting electrical and/or optical properties. This process can also be advantageously used in widely varying fields, e.g. in microelectronics, optoelectronics, integrated optics, non-linear optics, telecommunications and in systems for checking optical informations, as well as for producing flat screens. It is more particularly applicable to the production of embedded or surface-positioned electrical interconnections.
The irradiation of organic materials by means of high energy ion beams is a known method, which has in particular been described by T. VENKATESAN et al in J. Appl. Phys. 56, 10, 15.11.1984, pp. 2778 to 2787 and J. DAVENAS et al in Annales de Physique, supplement to colloquy no. 1, vol. 11, Feb. 1986, pp. 107 to 112.
Thus, the article of T. VANKATESAN et al studies the influence of irradiation by argon ions on the structure and electrical properties of 3,4,9,10-perylene tetracarboxylic dianhydride and nickel phthalocyanine films. The article states that the irradiation by high energy ions leads to the destruction of the molecular structure by breaking certain bonds and the loss of certain elements entering into the constitution of the film, so that there is a carbon enrichment of the film and an increase in its electrical conductivity. The article by J. DAVENAS et al studies the modification of the surface properties of organic polymer films exposed to irradiation by ion beams with an energy of 500 KeV. In this case, there is once again chemical bond breakage with the emission of a hydrogen atom, so that the electrical conductivity of the polymer is improved.
However, up to now, irradiation by means of high energy ion beams has not made it possible to form in the thickness of a film structures having three superimposed alternating insulating/semimetal layers.
The present invention specifically relates to a process making it possible to produce such structures in an organic polymer film.
The inventive process for forming in the thickness of a film a structure having at least two superimposed layers constituted by an insulating layer and a semimetallic layer is characterized in that at least certain surface zones of an electrically insulating organic polymer film undergo irradiation by means of a beam of high energy ions with an adequate energy for the ions to traverse the polymer film.
A better understanding of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
FIG. 1 shows a vertical section of a film embodiment of the present invention subjected to ion irradiation, which film has a semi-metallic/insulant/semi-metallic structure; and
FIG. 2 shows a vertical section of a film embodiment of the invention subjected to ion irradiation, which film has an insulant/semi-metallic/insulant structure.
Preferably, the energy of the ions is at least 1 MeV/amu (atomic mass unit).
According to the invention, the use of ions with an energy of at least 1 MeV/amu makes it possible to obtain a disturbance and a modification of the polymer film by using electronic interactions between the ions which pass through the polymer film and the chains of said polymer.
Thus, a high energy heavy ion (whereof the energy is above 1 MeV per nucleon) produces in the material through which it passes a linear trace corresponding to an intense disturbance of the material. The diameter of said latent trace can be between 1 and 100 nm. In a polymer, this disturbance leads to structural modifications of the intermolecular and intramolecular architecture of the polymer. It mo
REFERENCES:
patent: 4199650 (1980-04-01), Mirtich
patent: 4677017 (1987-06-01), DeAntonis et al.
patent: 4743493 (1988-05-01), Sioshansi et al.
Journal of Applied Physics, vol. 56, No. 10, 15-Nov.-1984, American Institute of Physics, (New York, U.S.), T. Vekatesan et al.: "Structural and Chemical Analysis of Ion Beam Produced Conductive Regions . . . " pp. 2778-2787.
Journal of the American Chemical Society, vol. 77, No. 3. Feb. 1955, (Gaston, Pa., U.S.), P. Yen-Hsiung Feng et al.: "Electrical and Chemical Effects of .beta.-Radiation in Polystyrene" pp. 847-851.
Balanzat Emmanuel
Boiziau C.
Darnez Charles
Duraud Jean-Paul
Le Moel Alain
Buffalow Edith
Commissariat a l''Energie Atomique
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