Glass-containing pseudo-reference electrode for use in ion-selective electrode sensors and ion selective field-effect transistors

Patent metadata

Field	Value
Publication number	US-11873246-B2
Application number	US-202217658366-A
Country	US
Kind code	B2
Filing date	Apr 7, 2022
Priority date	Apr 9, 2021
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A pseudo-reference electrode comprising a pseudo-reference glass material backed by a silver conductor comprising silver metal, wherein the pseudo-reference glass material is a chalcogenide glass comprising a silver chalcogenide Ag2Ch, wherein Ch denotes a chalcogen, or a halide glass comprising a silver halide and at least one glass-forming oxide of a metal or a metalloid, a mixture of two or more of these glasses, or a composite of at least one of these glasses. This pseudo-reference electrode can be used in ion-selective electrode (ISE) sensors and ion-selective field effect transistors (ISFETs).

First claim

The invention claimed is:

1. A pseudo-reference electrode comprising a pseudo-reference glass material backed by a silver conductor comprising silver metal,
wherein the pseudo-reference glass material is:
a chalcogenide glass comprising a silver chalcogenide Ag 2 Ch, wherein Ch denotes a chalcogen, or
a halide glass comprising a silver halide and at least one glass-forming oxide of a metal or a metalloid,

a mixture of two or more of these glasses, or
a composite of at least one of these glasses.

2. The pseudo-reference electrode of claim 1 , wherein the chalcogenide glass further comprises an arsenic chalcogenide As 2 Ch 3 , wherein Ch denotes a chalcogen.

3. The pseudo-reference electrode of claim 2 , wherein the chalcogenide glass is a Ag 2 S—As 2 S 3 , Ag 2 S—Ag 2 Te—As 2 S 3 , Ag 2 S—As 2 S 3 —AgI, or Ag 2 S—As 2 S 3 —AgBr glass.

4. The pseudo-reference electrode of claim 1 , wherein the chalcogenide glass comprises two silver chalcogenides.

5. The pseudo-reference electrode of claim 4 , wherein the chalcogenide glass is a Ag 2 S—Ag 2 Se or Ag 2 Se—Ag 2 Te—As 2 Se 3 glass.

6. The pseudo-reference electrode of claim 1 , wherein the chalcogenide glass further comprises a germanium chalcogenide GeCh, wherein “Ch” denotes a chalcogen.

7. The pseudo-reference electrode of claim 6 , wherein the chalcogenide glass is a Ag 2 Se—GeSe or Ag 2 S—GeS glass.

8. The pseudo-reference electrode of claim 1 , wherein the chalcogenide glass further comprises a silver halide.

9. The pseudo-reference electrode of claim 8 , wherein the silver halide is silver iodide or silver bromide.

10. The pseudo-reference electrode of claim 8 , wherein the chalcogenide glass is a Ag 2 S—As 2 S 3 —AgI or Ag 2 S—As 2 S 3 —AgBr glass.

11. The pseudo-reference electrode of claim 1 , wherein the chalcogenide glass is a Ag 2 S—As 2 S 3 , Ag 2 S—Ag 2 Se, Ag 2 Se—GeSe, Ag 2 S—As 2 S 3 —AgI, Ag 2 S—As 2 S 3 —AgBr, Ag 2 S—GeS, or Ag 2 Se—Ag 2 Te—As 2 Se 3 glass.

12. The pseudo-reference electrode of claim 1 , wherein the chalcogen(s) is(are) selected from the group consisting of S, Se, and Te.

13. The pseudo-reference electrode of claim 1 , wherein the silver halide in the halide glasses is silver fluoride, silver chloride, silver bromide, or silver iodide.

14. The pseudo-reference electrode of claim 1 , wherein the halide glass comprises silver oxide and at least one other glass-forming oxide of metal/metalloid.

15. The pseudo-reference electrode of claim 14 , wherein a silver oxide: other glass-forming oxide(s) of metal/metalloid molar ratio in the halide glass is from about 0.2-0.8 to about 0.8-0.2.

16. The pseudo-reference electrode of claim 1 , wherein a silver halide: total glass-forming oxide(s) of metal/metalloid in the halide glass is from about 0.4:0.6 to about 0.7:0.3.

17. The pseudo-reference electrode of claim 1 , wherein the glass-forming oxide(s) of metal/metalloid is(are) AgO, P 2 O 5 , VO 3 , CrO 2 , SiO 2 , SnO 2 , PbO 2 , MoO 4 , and/or WO 4 .

18. The pseudo-reference electrode of claim 1 , wherein the halide glass is:
AgI x (Ag 2 O) y (MoO 3 );
AgI x (Ag 2 O) y (P 2 O 5 ) z ; or
AgI x (Ag 2 O) y (WO 3 ),
wherein x, y, and z are molar ratios, wherein x varies from about 0.4 to about 0.7, y varies from about 0.08 to about 0.56 and z varies from about 0.08 to about 0.56.

19. The pseudo-reference electrode of claim 1 , wherein the composite comprises:
at least one chalcogenide glass or halide glass and binder, or
at least one chalcogenide glass or halide glass, a binder, and an electrically conductive carbon allotrope.

20. The pseudo-reference electrode of claim 1 , wherein the silver conductor is supported on an electrically insulating substrate.

Assignees

• Nat Res Council Canada

Inventors

• Dy Eben
• Qu Wei
• Xie Zhong
• Shen Jun
• Tufa Kidus Y

Classifications

• C03C3/321 Primary

  Chalcogenide glasses, e.g. containing S, Se, Te · CPC title

• C03C3/12

  Silica-free oxide glass compositions · CPC title

• C03C3/32

  Non-oxide glass compositions, e.g. binary or ternary halides, sulfides or nitrides of germanium, selenium or tellurium · CPC title

• C03C3/323

  containing halogen, e.g. chalcohalide glasses · CPC title

• C03C3/325

  Fluoride glasses · CPC title