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29 results on '"Tortai, J.-H."'

4. Core-shell percolative nanodielectric for high voltage integrated capacitors: comparative study on different metal carbon coated (Co, Ni & Cu) inclusions

Author

Lapeyronie, C., ALFONSO, M.S., Viala, B., TORTAI, J.-H., Clot, Marielle, Laboratoire des technologies de la microélectronique (LTM ), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
[PHYS]Physics [physics], ComputingMilieux_MISCELLANEOUS, [PHYS] Physics [physics]
Abstract

International audience

Published
2021

5. Core-Shell Percolative Nanodielectric for High Voltage Integrated Capacitors

Author

Alfonso, M, Viala, B, Tortai, J.-H, Laboratoire des technologies de la microélectronique (LTM ), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Alfonso, Marco Salvatore

Subjects
Condensed Matter::Soft Condensed Matter, [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], [SPI] Engineering Sciences [physics], dielectric properties, [CHIM] Chemical Sciences, Physics::Optics, [CHIM]Chemical Sciences, carbon coated nanoparticles, high-k composite, [PHYS] Physics [physics]
Abstract

International audience; High-k dielectric nanocomposites are promising materials to miniaturize integrated capacitors. In this work, we investigate core-shell Metal Polymer Composites (MPC) having nanoparticles (carbon-coated nickel, Ni@C) dispersed in a polymer matrix (Polystyrene). A three-step formulation (desagglomeration, surface functionalization and dispersion in a polymeric matrix) was used with simple sonochemical methods. The original core-shell structure of the MPC results of the grafting of a thin second polymer layer on the carbon coating. Finally, films of MPC were deposited on silicon wafers by spincoating and Metal-Insulator-Metal (MIM) capacitors were fabricated. The dielectric response was investigated by using broadband dielectric spectroscopy.Preliminary results show that below the percolation threshold, MPC with a core-shell structure exhibits twice the dielectric constant of the polymer with similar losses that is encouraging for the future (higher dielectric constant, similar loss).

Published
2019

6. Diagnostic of the self-healing of metallized polypropylene film by modeling of the broadening emission lines of aluminum emitted by plasma discharge

Author

Tortai, J.-H., Bonifaci, N., Denat, A., and Trassy, C.

Subjects
Plasma density -- Research, Physics
Abstract

An analysis, based on the broadenings and shifts of Al atomic lines, of the experimental light spectra obtained describes that the self-healing process leads to generation, from the vaporized metal, of a high-density and relatively weakly ionized aluminum plasma. The plasma density increases with the pressure applied on the film layers following which the density power needed to extend the plasma zone increases as well and the arc discharge goes out faster.

Published
2005

8. Non-conductive ferromagnetic carbon-coated (Co, Ni) metal/polystyrene nanocomposites films.

Author

Takacs, H., Viala, B., Tortai, J.-H., Hermán, V., and Duclairoir, F.

Subjects
FERROMAGNETIC materials, POLYSTYRENE, NANOCOMPOSITE materials, ELECTRIC insulators & insulation, MAGNETIZATION transfer
Abstract

This article reports non-conductive ferromagnetic properties of metal/polymer nanocomposite films intended to be used for RF applications. The nanocomposite arrangement is unique showing a core double-shell structure of metal-carbon-polystyrene: M/C//P1/P2, where M=Co, Ni is the core material, C=graphene or carbon is the first shell acting as a protective layer against oxidation, P1=pyrene-terminated polystyrene is the second shell for electrical insulation, and P2=polystyrene is a supporting matrix (// indicates actual grafting). The nanocomposite formulation is briefly described, and the film deposition by spin-coating is detailed. Original spin-curves are reported and analyzed. One key outcome is the achievement of uniform and cohesive films at the wafer scale. Structural properties of films are thoroughly detailed, and weight and volume fractions of M/C are considered. Then, a comprehensive overview of DC magnetic and electrical properties is reported. A discussion follows on the magnetic softness of the nanocomposites vs. that of a single particle (theoretical) and the raw powder (experimental). Finally, unprecedented achievement of high magnetization (~0.6 T) and ultra-high resistivity (~1010µΩ cm) is shown. High magnetization comes from the preservation of the existing protective shell C, with no significant degradation on the particle net-moment, and high electrical insulation is ensured by adequate grafting of the secondary shell P1. To conclude, the metal/polymer nanocomposites are situated in the landscape of soft ferromagnetic materials for RF applications (i.e., inductors and antennas), by means of two phase-diagrams, where they play a crucial role. [ABSTRACT FROM AUTHOR]

Published
2016
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11. Material and processing impact on thermal properties of thin resist films for high resolution lithography

Author

Tortai, J. H., sandrine marceau, Karadimos, G., Vourdas, N., Gogolides, E., Raptis, I., Werden, K., Laboratoire des technologies de la microélectronique (LTM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Clot, Marielle

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2005

13. Dispositif de caractérisation thermique des résines

Author

Tortai, J-H., Landis, S., Clot, Marielle, Laboratoire des technologies de la microélectronique (LTM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Joseph Fourier - Grenoble 1 (UJF)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [PHYS] Physics [physics]
Published
2003

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