Directly photo-patternable, stretchable, electrically conductive polymer

Patent metadata

Field	Value
Publication number	US-12019372-B2
Application number	US-202016867435-A
Country	US
Kind code	B2
Filing date	May 5, 2020
Priority date	May 9, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

One or more embodiments relate to an electrically conductive polymer with a crosslinkable additive. The electrically conductive polymer is a directly photopatternable Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) PEDOT:PSS film with cross-linked network made of a plurality of monomers. The directly photopatternable PEDOT:PSS film PEDOT as such has a better conductivity and stretchability compared to its other counterparts. The directly photopatternable PEDOT:PSS film can further be supplemented with poly(ethylene glycol) diacrylate (PEGDA) which can help with the removal of PSS. Advantageously, the PEGDA supplemented PEDOT:PSS film can exhibit a larger charge storage capacity.

First claim

What is claimed is:

1. A film comprising:
an electrically conductive polymer, wherein the electrically conductive polymer comprises poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS); and
a cross-linked network intermixed with the electrically conductive polymer, wherein the crosslinked network is of poly(ethylene glycol) diacrylate (PEGDA),
wherein a dry mass ratio of PEGDA versus PEDOT in the cross-linked network intermixed with the electrically conductive polymer is about 12% to about 65%, and
wherein the intermixing of the cross-linked network with the electrically conductive polymer is configured to cause the film to have:
an electrical conductivity of at least about 100 S/cm;
a maximum tensile strain of at least about 10%; and
a light transmittance at a wavelength of 550 nm of at least about 30%.

2. The film of claim 1 , wherein the intermixing of the cross-linked network with the electrically conductive polymer is further configured to cause the film to have a higher interfacial capacity and a lower impedance compared to a 3-Glycidyloxypropyl)trimethoxysilane (GOPS) crosslinked poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) in a range of about 1-10 kHz.

3. The film of claim 2 , wherein the film is further configured to sense an electrocardiographic or an electromyographic signal.

4. The film of claim 3 , wherein the film further includes an Au film on which the electrically conductive polymer and intermixed cross-linked network is coated.

5. The film of claim 4 , wherein the coating has a thickness in the range of 60 nm to 928 nm.

6. The film of claim 1 , wherein the intermixing of the cross-linked network with the electrically conductive polymer is further configured to cause the film to have a current density of up to about 15 μA/cm 2 .

7. The film of claim 1 , wherein the intermixing of the cross-linked network with the electrically conductive polymer is further configured to cause the film to have a charge storage capacity of at least 1.2 mC/cm 2 .

8. The film of claim 1 , wherein a molar ratio of PSS and PEDOT as characterized by an atomic ratio of sulfur (S) in PSS and PEDOT is about 1.8 or less.

9. The film of claim 1 , wherein a molar ratio of PSS and PEDOT as characterized by an atomic ratio of sulfur (S) in PSS and PEDOT is about 1.3 or less.

Assignees

• Univ Leland Stanford Junior

Inventors

• Bao Zhenan
• Jiang Yuanwen

Classifications

• A61B5/296

  for electromyography [EMG] · CPC title

• A61B5/282

  Holders for multiple electrodes (for introduction into the body A61B5/287) · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• H01B13/0036

  Details · CPC title

• H01B1/127 Primary

  comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes · CPC title