Piezoelectric device

Patent metadata

Field	Value
Publication number	US-10056542-B2
Application number	US-201615076942-A
Country	US
Kind code	B2
Filing date	Mar 22, 2016
Priority date	Mar 24, 2015
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A piezoelectric device including a paper film including cellulose fibers and containing an additive selected from the group including 4-fluorophenethyl isocyanate, 2-2 diphenyl-ethyl isocyanate, nitrophenyl isocyanate, 1-adamantyl iso-cyanate, cyanophenyl isocyanate, and triphenylamine grafted to the cellulose fibers, the film further having a first surface and a second surface opposite to the first surface and a first electrode arranged on the first surface and a second electrode arranged on the second surface.

First claim

What is claimed is:

1. A piezoelectric device comprising:
a paper film comprising cellulose fibers and containing an additive selected from the group comprising 4-fluorophenethyl isocyanate, 2-2 diphenylethyl isocyanate, nitrophenyl isocyanate, 1-adamantyl isocyanate, cyanophenyl isocyanate, and triphenylamine grafted to the cellulose fibers, the film further having a first surface and a second surface opposite to the first surface; and
a first electrode arranged on the first surface and a second electrode arranged on the second surface.

2. The piezoelectric device of claim 1 , further comprising:
a piezoelectric layer extending on the first electrode; and
a third electrode, the piezoelectric layer being interposed between the first electrode and the third electrode.

3. The piezoelectric device of claim 2 , wherein the piezoelectric layer comprises polyvinylidene fluoride and/or at least one copolymer of polyvinylidene fluoride, particularly a polymer selected from the group comprising polyvinylidene fluoride, poly(vinylidene fluoride-tri fluoro ethylene), poly(vinylidene fluoride-tetra fluoro ethylene), and a mixture of at least two of these polymers.

4. The piezoelectric device of claim 1 , further comprising a first coating between the first surface and the first electrode and a second coating between the second surface and the second electrode.

5. The piezoelectric device of claim 4 , wherein the first coating and/or the second coating comprise a material selected from the group comprising 3-aminopropyl trimethyloxysilane, polyimides, and poly(N-isopropylacrylamide).

6. The piezoelectric device of claim 1 , wherein the first electrode and/or the second electrode comprise through openings.

7. A method of manufacturing an optoelectronic device, comprising the steps of:
a) providing a paper film comprising cellulose fibers and having a first surface ( 14 ) and a second surface, opposite to the first surface;
b) dipping the paper film into a solution comprising at least one additive selected from the group comprising 4-fluorophenethyl isocyanate, 2-2 diphenylethyl iso-cyanate, nitrophenyl isocyanate, 1-adamantyl isocyanate, cyano-phenyl isocyanate, and triphenylamine;
c) grafting the additive to the cellulose fibers; and
d) forming a first electrode on the first surface and a second electrode on the second surface.

8. The method of claim 7 , wherein step c) comprises exposing the paper film to pulses of an ultraviolet radiation.

9. The method of claim 8 , wherein the pulses have a duration in the range from 0.5 to 2 ms and an energy fluence in the range from 5 to 20 J/cm2.

10. The method of claim 7 , further comprising the steps of:
e) forming a layer comprising a solvent and polyvinylidene fluoride and/or at least one copolymer of polyvinylidene fluoride, particularly a polymer selected from the group comprising polyvinylidene fluoride, poly(vinylidene fluoride-tri fluoro ethylene), poly(vinylidene fluoride-tetra fluoro ethylene), and a mixture of at least two of these polymers; and
f) exposing the layer to pulses of an ultraviolet radiation.

Assignees

• Commissariat Energie Atomique
• Commissariat Energie Atomique

Inventors

• Aliane Abdelkader
• Benwadih Mohammed

Classifications

• H01L41/45

  Electricity · mapped topic

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R31/00

  Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor {(manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182)} · CPC title

• H01L41/0478

  Electricity · mapped topic

• H04R2307/029

  Diaphragms comprising fibres · CPC title