Printed gas sensor

• US 9,784,708 B2
• Filed: 06/27/2014
• Issued: 10/10/2017
• Est. Priority Date: 11/24/2010
• Status: Active Grant

• Current Assignee: Sensirion AG (Sensirion Holding AG)
• Original Assignee: SPEC Sensors, LLC (Interlink Electronics Incorporated)
• Inventors: Stetter, Joseph R., Patel, Vinay, Findlay, Melvin W., Carter, Michael T.
• Primary Examiner(s): Ball, J. Christopher
• Application Number:
  US14/317,222
• Publication Number:
  US 20140311905A1
• Time in Patent Office: 1,201 Days
• CPC Class Codes: B01J 31/06 containing polymers organometallic polymers B01J31/123; polymer-bound organometallic complexes B01J31/165; coordination polymers B01J31/1691
• CPC Class Codes: B32B 2309/105 Thickness
• CPC Class Codes: B32B 2310/0806 using electromagnetic radiation
• CPC Class Codes: B32B 2310/0843 using laser
• CPC Class Codes: B32B 2323/10 Polypropylene
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 37/185 Laminating sheets, panels or inserts between two discrete plastic layers
• CPC Class Codes: B32B 38/0004 Cutting, tearing or severing, e.g. bursting; Cutter details cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence
• CPC Class Codes: B32B 38/145 Printing
• CPC Class Codes: C09D 11/03 characterised by features other than the chemical nature of the binder
• CPC Class Codes: C09D 11/106 containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 11/52 Electrically conductive inks
• CPC Class Codes: G01N 27/4045 for gases other than oxygen

Abstract

A printed gas sensor is disclosed. The sensor may include a partially porous substrate, an electrode layer, an electrolyte layer, and an encapsulation layer. The electrode layer comprises one or more electrodes that are formed on one side of the porous substrate. The electrolyte layer is in electrolytic contact with the one or more electrodes. The encapsulation layer encapsulates the electrode layer and electrolyte layer thereby forming an integrated structure with the partially porous substrate.

Claims

1. A printed gas sensor comprising:

a first partially porous substrate comprising one or more gas access regions;

one or more printed runners coupled to the first partially porous substrate, wherein the one or more printed runners are non-porous and electrically conductive;

an encapsulation layer coupled to the first partially porous substrate and defining an electrolyte cavity positioned within the encapsulation layer;

a non-ionically conductive wick positioned within the electrolyte cavity;

one or more printed electrodes printed on the non-ionically conductive wick and in electrical communication with the one or more printed runners such that the one or more printed runners can transport an electronic signal produced by an electrochemical reaction at the one or more electrodes; and

an electrolyte housed within the electrolyte cavity in communication with the electrodes capable of electrolytic communication among the electrodes.

2. The printed gas sensor of claim 1, wherein the first partially porous substrate comprises a porous PTFE in which one or more pores are partially blocked by a nonporous material adhered to the substrate.

3. The printed gas sensor of claim 2, wherein the one or more pores partially blocked by the nonporous material are patterned using a mask and lithographic agents.

4. The printed gas sensor of claim 1, further comprising a second partially porous substrate positioned between the first partially porous substrate and the encapsulation layer wherein the second partially porous substrate further comprises a slot and a porous PTFE disk is positioned within the slot.

5. The printed gas sensor of claim 1, further comprising a second partially porous substrate positioned between the first partially porous substrate and the encapsulation layer wherein the second partially porous substrate further comprises a slot and a porous polypropylene or polyethylene disk is positioned within the slot, wherein the electrolyte has an electrolyte contact angle that is greater than 70 degrees.

6. The printed gas sensor of claim 5, wherein the second partially porous substrate comprises polyethylene terephthalate.

7. The printed gas sensor of claim 1, wherein the encapsulation layer comprises an electrolyte fill port layer and an encapsulation cavity ring positioned between and coupled to both the first partially porous substrate and the electrolyte fill port layer thereby forming the electrolyte cavity within the encapsulation cavity ring.

8. The printed gas sensor of claim 1, wherein the non-ionically conductive wick comprises an electrolyte matrix selected from one or more of the following:

compressible glass fiber, porous hydrophilic polypropylene or polyethylene, silica gel, or alumina.

9. The printed gas sensor of claim 1, wherein the one or more electrodes are printed on the non-ionically conductive wick before the non-ionically conductive wick is positioned within the electrolyte cavity.

10. The printed gas sensor of claim 9, wherein the one or more electrodes are printed on the non-ionically conductive wick using screen printing, gravure, inkjet printing, or stenciling.

11. The printed gas sensor of claim 1, wherein the one or more electrodes are partially embedded in the non-ionically conductive wick.

12. The printed gas sensor of claim 1, wherein the one or more gas access regions comprise holes.

13. The printed gas sensor of claim 1, wherein the first partially porous substrate is partially coated with polyimide such that one or more uncoated regions of the first partially porous substrate comprise the one or more gas access regions of the first partially porous substrate.

14. The printed gas sensor of claim 1, wherein a pressure sensitive adhesive is disposed between the first partially porous substrate and the encapsulation layer.

15. The printed gas sensor of claim 1, wherein a thermal adhesive is disposed between the first partially porous substrate and the encapsulation layer.

16. The printed gas sensor of claim 1, wherein the first partially porous substrate and the encapsulation layer are welded together using ultrasonic bonding.

17. The printed gas sensor of claim 1, wherein the one or more printed runners terminate at one or more contact points to provide electrical communication between the one or more electrodes and one or more electrical circuits.

18. The printed gas sensor of claim 1, wherein the one or more printed runners form vias for electrical connection to the electrodes and are impervious to gases and electrolytes.

19. The printed gas sensor of claim 1, wherein the electrolyte comprises a room temperature ionic liquid, ionic polymer, aqueous salt solution, base or acid solution or sulfuric acid.

20. The printed gas sensor of claim 1, wherein the electrolyte comprises a dry material transformable into a liquid electrolyte when exposed to a vapor.

21. The printed gas sensor of claim 1, wherein the electrolyte is in contact with the one or more electrodes thereby providing a location for an electrochemical reaction between the electrolyte, the one or more electrodes, and a target gas.

22. The printed gas sensor of claim 1, wherein the electrolyte is in contact with the one or more electrodes at a contact angle of greater than or equal to 70°

.

23. The printed gas sensor of claim 1, wherein the electrolyte is in contact with the one or more electrodes at a contact angle of greater than or equal to 115°

.

24. The printed gas sensor of claim 1, further comprising a filter assembly coupled to the first partially porous substrate, the filter assembly comprising:

a fill port layer comprising one or more filter holes; and

a filter cavity ring coupled to the fill port layer, the filter cavity ring comprising filter material positioned within the filter cavity ring and covering the one or more gas access regions of the first partially porous substrate.

25. The printed gas sensor of claim 1, further comprising a reservoir assembly coupled to the encapsulation layer, the reservoir assembly comprising:

a reservoir fill port layer comprising one or more reservoir overflow holes;

a reservoir cavity ring coupled to and positioned between the reservoir fill port layer and the encapsulation layer; and

a reservoir plug coupled to the reservoir fill port layer opposite the reservoir cavity ring, wherein the reservoir plug hermetically seals the reservoir overflow holes of the reservoir fill port layer.

26. The printed gas sensor of claim 25, wherein a volume capacity of the reservoir assembly is about three to about six times greater than a volume capacity of the electrolyte in the encapsulation layer.

27. The printed gas sensor of claim 25, wherein a volume capacity of the reservoir assembly is about one to about 1.1 times greater than a volume capacity of the electrolyte in the encapsulation layer.

28. The printed gas sensor of claim 25, wherein the encapsulation layer further comprising a reservoir and wherein the volume capacity of the reservoir is about three to about six times greater than a volume capacity of the electrolyte in the encapsulation layer.

29. The printed gas sensor of claim 25, wherein the encapsulation layer further comprising a reservoir and wherein the volume capacity of the reservoir is about one to about 1.1 times greater than a volume capacity of the electrolyte in the encapsulation layer.

30. The printed gas sensor of claim 1, wherein the printed gas sensor is manufactured in a scalable manufacturing process configured to manufacture multiple printed gas sensors in one or more sheets of printed gas sensors.

31. The printed gas sensor of claim 1, wherein a size of the one or more gas access regions and a size of the one or more electrodes are directly correlated such that larger and/or more gas access regions correspond to larger and/or more electrodes.

32. The printed gas sensor of claim 31, wherein the size of the one or more electrodes is sized to minimize background noise.

33. The printed gas sensor of claim 31, wherein the size of the one or more electrodes is sized correlating to the maximum signal concentration of the printed gas sensor.

34. A printed gas sensor comprising:

a solid substrate comprising one or more gas access regions;

one or more printed runners positioned on the solid substrate;

an encapsulation housing coupled to the solid substrate thereby forming an electrolyte cavity between the encapsulation housing and the solid substrate;

a non-ionically conductive wick positioned within the electrolyte cavity;

an electrolyte housed within the encapsulation housing; and

one or more electrodes printed on the solid substrate within the electrolyte cavity, wherein the one or more electrodes are printed with catalyst inks and are in electrical communication with the one or more printed electrically conductive runners.

35. The printed gas sensor of claim 34, wherein the solid substrate comprises polycarbonate substrate, PET substrate, or a combination thereof.

36. The printed gas sensor of claim 34, wherein the encapsulation housing comprises polycarbonate substrate, PET substrate, or a combination thereof.

37. The printed gas sensor of claim 34, wherein the catalyst inks of the one or more electrodes are curable at temperatures lower than a deformation point of the solid substrate and a deformation point of the encapsulation housing.

38. The printed gas sensor of claim 34, wherein the catalyst inks are printed with a catalyst ink suspension comprising:

a mixture comprising;

about 75-79% Pt;

about 8-9% graphite carbon; and

about 15-17% dry polypropylene powder; and

a 3 mL ethyl cellulose solution.

39. The printed gas sensor of claim 38, wherein the ethyl cellulose solution further comprises octanol.

40. The printed gas sensor of claim 34, wherein the catalyst inks are printed on the solid substrate using process that involves sonication, dispersion, and stabilization.

41. The printed gas sensor of claim 34, wherein the one or more gas access regions comprise holes.

42. The printed gas sensor of claim 34, wherein the solid substrate is partially coated with polyimide such that one or more uncoated regions of the solid substrate comprise the one or more gas access regions of the solid substrate.

43. The printed gas sensor of claim 34, wherein a size of the one or more gas access regions and a size of the one or more electrodes are directly correlated such that larger and/or more gas access regions correspond to larger and/or more electrodes.

44. The printed gas sensor of claim 34, further comprising a filter assembly coupled to the solid substrate, the filter assembly comprising:

a fill port layer comprising one or more filter holes; and

a filter cavity ring coupled to the fill port layer, the filter cavity ring comprising filter material positioned within the filter cavity ring and covering the one or more gas access regions of the solid substrate.

45. The printed gas sensor of claim 34, further comprising a reservoir assembly coupled to the encapsulation housing, the reservoir assembly comprising:

a reservoir fill port layer comprising one or more reservoir overflow holes;

a reservoir cavity ring coupled to and positioned between the reservoir fill port layer and the encapsulation housing; and

a reservoir plug coupled to the reservoir fill port layer opposite the reservoir cavity ring, wherein the reservoir plug hermetically seals the reservoir overflow holes of the reservoir fill port layer.

46. The printed gas sensor of claim 45, wherein a volume capacity of the reservoir assembly is about three to about six times greater than a volume capacity of the electrolyte.

47. The printed gas sensor of claim 34, wherein the printed gas sensor is manufactured in a scalable manufacturing process configured to manufacture the printed gas sensor in one or more sheets of printed gas sensors.

48. The printed gas sensor of claim 34, wherein the electrolyte comprises a dry material transformable into a liquid electrolyte when exposed to a vapor.

49. A printed gas sensor comprising:

a high temperature upper substrate having one or more gas access regions;

a high temperature lower substrate;

one or more sealer spacers positioned between and coupled to the high temperature upper substrate and the high temperature lower substrate forming an electrolyte cavity there-between;

an electrolyte housed within the electrolyte cavity;

one or more electrodes positioned within the electrolyte cavity and printed on the high temperature upper and/or lower substrate;

wherein the high temperature upper substrate and the high temperature lower substrate can withstand temperatures of at least 260°

C.

50. The printed gas sensor of claim 49, wherein the high temperature upper substrate and the high temperature lower substrate comprise PTFE, polyimide, Kapton, polyethylene napthalate, polyvinyl pyrollidone combinations thereof.

51. The printed gas sensor of claim 49, further comprising a filter assembly coupled to the high temperature upper substrate, the filter assembly comprising:

a fill port layer comprising one or more filter holes; and

a filter cavity ring coupled to the fill port layer, the filter cavity ring comprising filter material positioned within the filter cavity ring and covering the one or more gas access regions of the high temperature upper substrate.

52. The printed gas sensor of claim 49, further comprising a reservoir assembly coupled to the high temperature lower substrate, the reservoir assembly comprising:

a reservoir fill port layer comprising one or more reservoir overflow holes;

a reservoir cavity ring coupled to and positioned between the reservoir fill port layer and the high temperature lower substrate; and

a reservoir plug coupled to the reservoir fill port layer opposite the reservoir cavity ring, wherein the reservoir plug hermetically seals the reservoir overflow holes of the reservoir fill port layer.

53. The printed gas sensor of claim 52, wherein a volume capacity of the reservoir assembly is about three to about six times greater than a volume capacity of the electrolyte cavity.

54. The printed gas sensor of claim 49, wherein the printed gas sensor is manufactured in a scalable manufacturing process configured to manufacture the printed gas sensor in one or more sheets of printed gas sensors.

55. The printed gas sensor of claim 49, wherein the electrolyte comprises a dry material transformable into a liquid electrolyte when exposed to a vapor.

56. The printed gas sensor of claim 55, wherein a size of the one or more gas access regions and a size of the one or more electrodes are directly correlated such that larger and/or more gas access regions correspond to larger and/or more electrodes.